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Articoli di riviste sul tema "Perceived distortion"

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Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 7 febbraio 2022

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1

Tong, Jonathan, Robert S. Allison e Laurie M. Wilcox. "The Impact of Radial Distortions in VR Headsets on Perceived Surface Slant". Journal of Imaging Science and Technology 63, n. 6 (1 novembre 2019): 60409–1. http://dx.doi.org/10.2352/j.imagingsci.technol.2019.63.6.060409.

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Abstract Modern virtual reality (VR) headsets use lenses that distort the visual field, typically with distortion increasing with eccentricity. While content is pre-warped to counter this radial distortion, residual image distortions remain. Here we examine the extent to which such residual distortion impacts the perception of surface slant. In Experiment 1, we presented slanted surfaces in a head-mounted display and observers estimated the local surface slant at different locations. In Experiments 2 (slant estimation) and 3 (slant discrimination), we presented stimuli on a mirror stereoscope, which allowed us to more precisely control viewing and distortion parameters. Taken together, our results show that radial distortion has significant impact on perceived surface attitude, even following correction. Of the distortion levels we tested, 5% distortion results in significantly underestimated and less precise slant estimates relative to distortion-free surfaces. In contrast, Experiment 3 reveals that a level of 1% distortion is insufficient to produce significant changes in slant perception. Our results highlight the importance of adequately modeling and correcting lens distortion to improve VR user experience.

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Hassan, Muhammad, Adithi D. Chakravarthy, Mahadevan Subramaniam, Parvathi Chundi, Mohammad Ali Sadiq, Muhammad Sohail Halim, Rubbia Afridi et al. "Correction of perceived visual distortions using a software application and correlation to age-related macular degeneration". Therapeutic Advances in Ophthalmology 12 (gennaio 2020): 251584142091778. http://dx.doi.org/10.1177/2515841420917783.

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Purpose: To investigate the use of software-generated corrections in neutralizing perceived distortions in age-related macular degeneration. Methods: A tablet-based application was utilized to elicit distortions. Five subjects (seven eyes: neovascular age-related macular degeneration and three eyes: non-neovascular age-related macular degeneration) traced the reference lines, and their distortion traces were recorded. To counter distortion, a software-generated trace was re-traced by subjects to produce a corrected trace. Final traces were superimposed on optical coherence tomography images and following distances calculated: (a) dDT: distance between distortion trace and reference line; (b) dGT: distance between software-generated trace and corrected trace; (c) dCT: distance between corrected trace and reference line. Mean percent improvement in distortion was reported. Mean effectiveness of correction was also reported by utilizing t test to compare dDT and dCT. The number of distortion traces with underlying lesions on optical coherence tomography was also analyzed. Results: Mean age of the subjects was 76.6 (±9.5) years. Each patient traced six reference lines and each was considered a separate case. Out of 30 cases, 17 (56.6%) elicited distortion. Mean percent improvement in distortion was 71.3 ± 23% ( p < 0.05). Twelve cases (70.6%) had an underlying lesion (eight cases: disrupted photoreceptor layer and four cases: normal photoreceptor layer). Mean percent improvement in cases with normal photoreceptor layer (90.8 ± 5.45%) was higher than with abnormal photoreceptor layer (58.5 ± 7.17%) ( p < 0.05). Five cases with distortion had no associated underlying lesion. Mean percent improvement in these subjects was significantly higher than those with photoreceptor layer disruption. Conclusion: Software-generated corrections can potentially correct for perceived distortions in patients with age-related macular degeneration, especially in cases with preserved photoreceptor layer.

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Herbst, Jan-Peter. "Distortion and Rock Guitar Harmony". Music Perception 36, n. 4 (1 aprile 2019): 335–52. http://dx.doi.org/10.1525/mp.2019.36.4.335.

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Research on rock harmony accords with common practice in guitar playing in that power chords (fifth interval) with an indeterminate chord quality as well as major chords are preferred to more complex chords when played with a distorted tone. This study explored the interrelated effects of distortion and harmonic structure on acoustic features and perceived pleasantness of electric guitar chords. Extracting psychoacoustic parameters from guitar tones with Music Information Retrieval technology revealed that the level of distortion and the complexity of interval relations affects sensorial pleasantness. A listening test demonstrated power and major chords being perceived as significantly more pleasant than minor and altered dominant chords when being played with an overdriven or distorted guitar tone. This result accords with musical practice within rock genres. Rather clean rock styles such as blues or classic rock use major chords frequently, whereas subgenres with more distorted guitars such as heavy metal largely prefer power chords. Considering individual differences, electric guitar players rated overdriven and distorted chords as significantly more pleasant. Results were ambiguous in terms of gender but indicated that women perceive distorted guitar tones as less pleasant than men. Rock music listeners were more tolerant of sensorial unpleasant sounds.

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Jang, Chan Young, Suk-Ju Kang e Young Hwan Kim. "Perceived Distortion-Based Progressive LCD Backlight Dimming Method". Journal of Display Technology 12, n. 10 (ottobre 2016): 1130–38. http://dx.doi.org/10.1109/jdt.2016.2590140.

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Garaas, T., e M. Pomplun. "Distortion in perceived object size accompanies saccadic adaptation". Journal of Vision 9, n. 8 (3 settembre 2010): 978. http://dx.doi.org/10.1167/9.8.978.

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Tuan, Kuang-mon, e Ronald Jones. "ADAPTATION OF PERCEIVED DIRECTION TO SPECTACLE INDUCED DISTORTION". Optometry and Vision Science 71, Supplement (dicembre 1994): 61. http://dx.doi.org/10.1097/00006324-199412001-00123.

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Morgan, M. J., I. Mareschal, C. Chubb e J. A. Solomon. "Perceived pattern regularity computed as a summary statistic: implications for camouflage". Proceedings of the Royal Society B: Biological Sciences 279, n. 1739 (21 marzo 2012): 2754–60. http://dx.doi.org/10.1098/rspb.2011.2645.

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Why do the equally spaced dots in figure 1 appear regularly spaced? The answer ‘because they are’ is naive and ignores the existence of sensory noise, which is known to limit the accuracy of positional localization. Actually, all the dots in figure 1 have been physically perturbed, but in the case of the apparently regular patterns to an extent that is below threshold for reliable detection. Only when retinal pathology causes severe distortions do regular grids appear perturbed. Here, we present evidence that low-level sensory noise does indeed corrupt the encoding of relative spatial position, and limits the accuracy with which observers can detect real distortions. The noise is equivalent to a Gaussian random variable with a standard deviation of approximately 5 per cent of the inter-element spacing. The just-noticeable difference in positional distortion between two patterns is smallest when neither of them is perfectly regular. The computation of variance is statistically inefficient, typically using only five or six of the available dots.

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Váša, L., e O. Petřík. "Optimising Perceived Distortion in Lossy Encoding of Dynamic Meshes". Computer Graphics Forum 30, n. 5 (agosto 2011): 1439–49. http://dx.doi.org/10.1111/j.1467-8659.2011.02018.x.

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Olofsson, Åke, e Martin Hansen. "Objectively measured and subjectively perceived distortion in nonlinear systems". Journal of the Acoustical Society of America 120, n. 6 (dicembre 2006): 3759–69. http://dx.doi.org/10.1121/1.2372591.

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Pobloth, Harald, e W. Bastiaan Kleijn. "Squared error as a measure of perceived phase distortion". Journal of the Acoustical Society of America 114, n. 2 (agosto 2003): 1081–94. http://dx.doi.org/10.1121/1.1594190.

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Edgar, G. "The influence of spatial distortion products on perceived speed". Ophthalmic and Physiological Optics 10, n. 3 (luglio 1990): 313. http://dx.doi.org/10.1016/0275-5408(90)90031-s.

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Martínez-Rach, Miguel O., Pablo Piñol, Otoniel M. López, Manuel Perez Malumbres, José Oliver e Carlos Tavares Calafate. "On the Performance of Video Quality Assessment Metrics under Different Compression and Packet Loss Scenarios". Scientific World Journal 2014 (2014): 1–18. http://dx.doi.org/10.1155/2014/743604.

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When comparing the performance of video coding approaches, evaluating different commercial video encoders, or measuring the perceived video quality in a wireless environment, Rate/distortion analysis is commonly used, where distortion is usually measured in terms of PSNR values. However, PSNR does not always capture the distortion perceived by a human being. As a consequence, significant efforts have focused on defining an objective video quality metric that is able to assess quality in the same way as a human does. We perform a study of some available objective quality assessment metrics in order to evaluate their behavior in two different scenarios. First, we deal with video sequences compressed by different encoders at different bitrates in order to properly measure the video quality degradation associated with the encoding system. In addition, we evaluate the behavior of the quality metrics when measuring video distortions produced by packet losses in mobile ad hoc network scenarios with variable degrees of network congestion and node mobility. Our purpose is to determine if the analyzed metrics can replace the PSNR while comparing, designing, and evaluating video codec proposals, and, in particular, under video delivery scenarios characterized by bursty and frequent packet losses, such as wireless multihop environments.

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Tan, Frédérique M. L., Wilko Grolman, Rinze A. Tange e Wytske J. Fokkens. "Quality of Perceived Sound after Stapedotomy". Otolaryngology–Head and Neck Surgery 137, n. 3 (settembre 2007): 443–49. http://dx.doi.org/10.1016/j.otohns.2007.03.038.

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OBJECTIVE: To evaluate the quality of perceived sound in relation to the audiometric result after stapedotomy. STUDY DESIGN: Ninety-eight patients with otosclerosis, who underwent stapedotomy between 2004 and 2005, participated in this retrospective study. Audiometric data were obtained before and after stapedotomy. Patients filled out two questionnaires: the Amsterdam Post Operative Sound Evaluation and the Operation Benefit Profile, which is based on the Glasgow Hearing Aid Benefit Profile. RESULTS: There were 83 responders and 15 nonresponders; 83% indicated that their hearing was now better compared to preoperatively. The sounds that gave the highest percentage of distortion were “high pitched sound” (15%) and “loud sound” (13%). The groups with an air-bone gap of 0 to 10 dB and 10 to 20 dB report a relatively high number of patients who experience distortion. The audiometric data correlate well with the Operation Benefit Score. CONCLUSIONS: Audiometric improvement does not necessarily mean an improvement in perceived sound and vice versa. But the audiometric outcome is significantly related to the patient's experienced handicap, benefit of the operation, residual difficulty, and overall satisfaction.

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Prévoteau, J., S. Chalençon-Piotin, D. Debons, L. Lucas e Y. Remion. "Multiview Shooting Geometry for Multiscopic Rendering with Controlled Distortion". International Journal of Digital Multimedia Broadcasting 2010 (2010): 1–11. http://dx.doi.org/10.1155/2010/975674.

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A fundamental element of stereoscopic and/or autostereoscopic image production is the geometrical analysis of the shooting and viewing conditions in order to obtain a qualitative 3D perception experience. This paper firstly compares the perceived depth with the shot scene depth from the viewing and shooting geometries for a couple of shooting and rendering devices. This yields a depth distortion model whose parameters are expressed from the geometrical characteristics of shooting and rendering devices. Secondly, these expressions are inverted in order to design convenient shooting layouts yielding chosen distortions on specific rendering devices. Thirdly, this design scheme provides three shooting technologies (3D computer graphics software, photo rail, and camera box system) producing qualitative 3D content for various kinds of scenes (real or virtual, still or animated), complying with any prechosen distortion when rendered on any specific multiscopic technology or device formerly specified.

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Palmisano, Stephen, Robert S. Allison e Ian P. Howard. "Illusory scene distortion occurs during perceived self-rotation in roll". Vision Research 46, n. 23 (novembre 2006): 4048–58. http://dx.doi.org/10.1016/j.visres.2006.07.020.

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Lee, T. C. P., S. K. Khuu, W. Li e A. Hayes. "Distortion in perceived image size accompanies flash lag in depth". Journal of Vision 8, n. 11 (1 agosto 2008): 20. http://dx.doi.org/10.1167/8.11.20.

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Coakley, A., e U. Wolfe. "A dissociation between haptic and visual distortion of perceived length". Journal of Vision 8, n. 6 (19 marzo 2010): 1048. http://dx.doi.org/10.1167/8.6.1048.

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Kim, Sarah, e Noel Harding. "The Effect of a Superior's Perceived Expertise on the Predecisional Distortion of Evidence by Auditors". AUDITING: A Journal of Practice & Theory 36, n. 1 (1 giugno 2016): 109–27. http://dx.doi.org/10.2308/ajpt-51508.

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SUMMARY Auditors have been shown to predecisionally distort the interpretation of evidence in a direction that favors the known preferences of their superior. This has the potential to adversely influence audit quality by threatening the objectivity with which evidence is evaluated. We, however, find results consistent with auditors perceiving their superior's known preference to be conveying normatively relevant information. Our results show, across both auditors from Australia and South Korea, that there are greater levels of predecisional distortion toward a preference held by a superior perceived to have relatively higher levels of expertise than toward a preference held by a superior perceived to have relatively lower levels of expertise. To the extent that auditors accurately perceive their superior's expertise, predecisional distortion of evidence may contribute to, rather than detract from, audit quality. Notwithstanding the potential for differences in hierarchical culture to influence the way in which auditors respond to the known preferences of their superior, our findings are consistent across auditors from Australia and South Korea. This suggests that the perceived expertise of the superior reduces the effect of hierarchical culture on the influence that a superior's known preference has on their subordinate's judgments. Data Availability: Contact the authors.

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Li, Hyung-Chul O., Eli Brenner, Frans W. Cornelissen e Eun-Soo Kim. "Systematic distortion of perceived 2D shape during smooth pursuit eye movements". Vision Research 42, n. 23 (ottobre 2002): 2569–75. http://dx.doi.org/10.1016/s0042-6989(02)00295-x.

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Erkelens, Casper J. "Virtual Slant Explains Perceived Slant, Distortion, and Motion in Pictorial Scenes". Perception 42, n. 3 (gennaio 2013): 253–70. http://dx.doi.org/10.1068/p7328.

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Brazelton, Elizabeth W., Katherine S. Greene, Malcolm Gynther e Jennifer O'Mell. "Femininity, Bulimia, and Distress in College Women". Psychological Reports 83, n. 1 (agosto 1998): 355–63. http://dx.doi.org/10.2466/pr0.1998.83.1.355.

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This study investigated differences in the scores on perceived Distress and Bulimia among college women with varying scores on the Behavioral Self-report of Femininity. Distress was assessed using The Psychological Distress Inventory and Bulimia was measured using the Bulimia Cognitive Distortions Scale. Women who reported low numbers of stereotypic feminine behaviors scored lower on the Bulimia Cognitive Distortions Scale than women reporting moderate to high numbers of stereotypic feminine behaviors. Distress scores were not significantly different between women scoring high and low on Bulimic Cognitive Distortions, and Bulimic Cognitive Distortion scores did not vary as a function of scores on Distress and Femininity. A multiple regression indicated that one factor of the Behavioral Self-report of Femininity, Social Connectedness, made a significant contribution to the prediction of Bulimia scores.

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Gray, Katie L. H., Jennifer Murphy, Jade E. Marsh e Richard Cook. "Modulation of the composite face effect by unintended emotion cues". Royal Society Open Science 4, n. 4 (aprile 2017): 160867. http://dx.doi.org/10.1098/rsos.160867.

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When upper and lower regions from different emotionless faces are aligned to form a facial composite, observers ‘fuse’ the two halves together, perceptually. The illusory distortion induced by task-irrelevant (‘distractor’) halves hinders participants' judgements about task-relevant (‘target’) halves. This composite-face effect reveals a tendency to integrate feature information from disparate regions of intact upright faces, consistent with theories of holistic face processing. However, observers frequently perceive emotion in ostensibly neutral faces, contrary to the intentions of experimenters. This study sought to determine whether this ‘perceived emotion’ influences the composite-face effect. In our first experiment, we confirmed that the composite effect grows stronger as the strength of distractor emotion increased. Critically, effects of distractor emotion were induced by weak emotion intensities, and were incidental insofar as emotion cues hindered image matching, not emotion labelling per se . In Experiment 2, we found a correlation between the presence of perceived emotion in a set of ostensibly neutral distractor regions sourced from commonly used face databases, and the strength of illusory distortion they induced. In Experiment 3, participants completed a sequential matching composite task in which half of the distractor regions were rated high and low for perceived emotion, respectively. Significantly stronger composite effects were induced by the high-emotion distractor halves. These convergent results suggest that perceived emotion increases the strength of the composite-face effect induced by supposedly emotionless faces. These findings have important implications for the study of holistic face processing in typical and atypical populations.

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Mu, Wenting, Michelle Schoenleber, Ariana Castro Leon e Howard Berenbaum. "Body Image Distortion Following Social Rejection or Acceptance Cues". Journal of Social and Clinical Psychology 38, n. 5 (maggio 2019): 395–408. http://dx.doi.org/10.1521/jscp.2019.38.5.395.

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Introduction: Body image has been shown to be subject to explicit, body-related feedback influences, yet little attention has been paid to subtle feedback about overall social acceptability. The current study tested competing hypotheses regarding women's body image after being primed with cued social rejection or acceptance. Whereas sociometer theory predicts that women will perceive their bodies more negatively following a social rejection prime, self-enhancement theory predicts the opposite. Method: A total of 105 female undergraduate students underwent a conditioning procedure in which distinctive tones were paired with signs of social rejection or acceptance. After this, body distortion (measured by a participant-adjusted virtual image), self-reported body satisfaction and affect were measured, while one of the tones sounded repeatedly in the background. Results: Compared with the acceptance condition, rejection condition participants reported greater state negative affect, F(1, 103) = 4.41, p = .04, greater state positive affect, F(1, 103) = 5.52, p = .02, and perceived their bodies as being smaller, F(1, 103) = 6.53, p = .01, consistent with the expectations of self-enhancement theory. Discussion: Implications of these findings are discussed regarding improved understanding of body image disturbance as well as development of novel clinical treatments.

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Tittle, James S., James T. Todd, Victor J. Perotti e J. Farley Norman. "Systematic distortion of perceived three-dimensional structure from motion and binocular stereopsis." Journal of Experimental Psychology: Human Perception and Performance 21, n. 3 (1995): 663–78. http://dx.doi.org/10.1037/0096-1523.21.3.663.

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Aznar-Casanova, J. Antonio, Elton H. Matsushima, Nilton P. Ribeiro-Filho e José A. Da Silva. "One-Dimensional and Multi-Dimensional Studies of the Exocentric Distance Estimates in Frontoparallel Plane, Virtual Space, and Outdoor Open Field". Spanish Journal of Psychology 9, n. 2 (novembre 2006): 273–84. http://dx.doi.org/10.1017/s113874160000617x.

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The aim of this study is twofold: on the one hand, to determine how visual space, as assessed by exocentric distance estimates, is related to physical space. On the other hand, to determine the structure of visual space as assessed by exocentric distance estimates. Visual space was measured in three environments: (a) points located in a 2-D frontoparallel plane, covering a range of distances of 20 cm; (b) stakes placed in a 3-D virtual space (range ≈ 330 mm); and (c) stakes in a 3-D outdoors open field (range = 45 m). Observers made matching judgments of distances between all possible pairs of stimuli, obtained from 16 stimuli (in a regular squared 4 × 4 matrix). Two parameters from Stevens' power law informed us about the distortion of visual space: its exponent and its coefficient of determination (R2). The results showed a ranking of the magnitude of the distortions found in each experimental environment, and also provided information about the efficacy of available visual cues of spatial layout. Furthermore, our data are in agreement with previous findings showing systematic perceptual errors, such as the further the stimuli, the larger the distortion of the area subtended by perceived distances between stimuli. Additionally, we measured the magnitude of distortion of visual space relative to physical space by a parameter of multidimensional scaling analyses, the RMSE. From these results, the magnitude of such distortions can be ranked, and the utility or efficacy of the available visual cues informing about the space layout can also be inferred.

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Aburagi, Yu, Natsuki Yamagiwa, Noriyuki Tanimoto, Shunsuke Ishimitsu, Mitsunori Matsumoto e Yasuki Murakami. "Acceleration sound design for vehicles using distortion products". INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, n. 4 (1 agosto 2021): 2494–500. http://dx.doi.org/10.3397/in-2021-2154.

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When considering the acoustic design of automobiles, low-frequency sounds can increase the excitement levels for users. However, there are several problems accompany an increase in the low-frequency levels of an engine sound. For example, it is difficult to create a balance between silence and excitement when a sound's different order components are changed. It is also difficult to generate heavy bass engine sounds in practical scenarios. Thus, the application of distortion products in the auditory system of the cochlea is considered. Distortion products are perceived when two or more sounds with slightly different frequencies are played simultaneously. This study was conducted to examine the possibility of achieving powerful engine sounds using distortion products. At first, the relationship between different combinations of complex sounds and the pitch perception of distortion products was investigated. As a second step, the application of distortion products to the acceleration sound was also considered. The results suggested the possibility of synthesizing a low-frequency component using distortion products inside a cochlea.

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Moore, Austin. "Dynamic Range Compression and the Semantic Descriptor Aggressive". Applied Sciences 10, n. 7 (30 marzo 2020): 2350. http://dx.doi.org/10.3390/app10072350.

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In popular music productions, the lead vocal is often the main focus of the mix and engineers will work to impart creative colouration onto this source. This paper conducts listening experiments to test if there is a correlation between perceived distortion and the descriptor “aggressive”, which is often used to describe the sonic signature of Universal Audio 1176, a much-used dynamic range compressor in professional music production. The results from this study show compression settings that impart audible distortion are perceived as aggressive by the listener, and there is a strong correlation between the subjective listener scores for distorted and aggressive. Additionally, it was shown there is a strong correlation between compression settings rated with high aggressive scores and the audio feature roughness.

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Mable, Harriett M., William D. G. Balance e Richard J. Galgan. "Body-Image Distortion and Dissatisfaction in University Students". Perceptual and Motor Skills 63, n. 2 (ottobre 1986): 907–11. http://dx.doi.org/10.2466/pms.1986.63.2.907.

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The present study investigated body-image distortion and body-image dissatisfaction for a sample of 75 male and 75 female university students, in relation to personality variables implicated in the literature, such as sex-role orientation, self-esteem, locus of control, and depression. Women perceived their weight deviation from the norm at over 15% above their actual deviation, whereas men distorted less than 1%. In a multiple regression analysis, none of the personality measures correlated significantly with body-image distortion; however, sex of subject accounted for 25% of its variance. Body dissatisfaction was significantly associated with low self-esteem, externality, depression, and distortion. The relationship between body-image distortion and dissatisfaction, although significant, was surprisingly small Apparently, these two aspects of body-image disturbance represent quite distinct constructs.

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Cunningham, Stuart, e Iain McGregor. "Subjective Evaluation of Music Compressed with the ACER Codec Compared to AAC, MP3, and Uncompressed PCM". International Journal of Digital Multimedia Broadcasting 2019 (11 luglio 2019): 1–16. http://dx.doi.org/10.1155/2019/8265301.

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Audio data compression has revolutionised the way in which the music industry and musicians sell and distribute their products. Our previous research presented a novel codec named ACER (Audio Compression Exploiting Repetition), which achieves data reduction by exploiting irrelevancy and redundancy in musical structure whilst generally maintaining acceptable levels of noise and distortion in objective evaluations. However, previous work did not evaluate ACER using subjective listening tests, leaving a gap to demonstrate its applicability under human audio perception tests. In this paper, we present a double-blind listening test that was conducted with a range of listeners (N=100). The aim was to determine the efficacy of the ACER codec, in terms of perceptible noise and spatial distortion artefacts, against de facto standards for audio data compression and an uncompressed reference. Results show that participants reported no perceived differences between the uncompressed, MP3, AAC, ACER high quality, and ACER medium quality compressed audio in terms of noise and distortions but that the ACER low quality format was perceived as being of lower quality. However, in terms of participants’ perceptions of the stereo field, all formats under test performed as well as each other, with no statistically significant differences. A qualitative, thematic analysis of listeners’ feedback revealed that the noise artefacts that produced the ACER technique are different from those of comparator codecs, reflecting its novel approach. Results show that the quality of contemporary audio compression systems has reached a stage where their performance is perceived to be as good as uncompressed audio. The ACER format is able to compete as an alternative, with results showing a preference for the ACER medium quality versions over WAV, MP3, and AAC. The ACER process itself is viable on its own or in conjunction with techniques such as MP3 and AAC.

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FLAHERTY, MICHAEL G. "An S-shaped pattern in the perceived passage of time: how social interaction governs temporal experience". Language and Cognition 10, n. 1 (19 febbraio 2016): 1–25. http://dx.doi.org/10.1017/langcog.2016.4.

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abstractVariation in the passage of time is perceived against the backdrop of standard temporal units. Under certain conditions, we perceive time to be passing slowly. In other settings, our subjective temporal experience is roughly synchronized with the objective time of clocks or calendars. And given different circumstances, we perceive time to have passed quickly. Drawing from 740 narratives that depict distortion in the perceived passage of time, I formulate a theory that accounts for the full range of variation in temporal experience. This theory can be represented by an S-shaped figure. According to this theory, variation in the perceived passage of time reflects variation in the density of experience per standard temporal unit. In turn, the density of experience per standard temporal unit is conditioned by the dynamics of social interaction. In its original form, however, this theory assumes that one’s circumstances shape one’s temporal experience in deterministic fashion. Consequently, based upon interviews with 406 disparate people, I conceptualize time work (or temporal agency) as one’s efforts to control, manipulate, or customize one’s own temporal experience or that of others. I conclude with some directions for future research.

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Jurs, B., A. Burkhardt, L. Blaha, G. Rhodes, L. Jeffery e T. Busey. "Adaptation modulates the electrophysiological substrates of perceived facial distortion: Support for opponent coding". Journal of Vision 11, n. 11 (23 settembre 2011): 583. http://dx.doi.org/10.1167/11.11.583.

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Irving-Bell, L. "A distortion of perceived space in patients withright-hemisphere lesions and visual hemineglect". Neuropsychologia 37, n. 8 (1 luglio 1999): 919–25. http://dx.doi.org/10.1016/s0028-3932(98)00147-x.

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Burkhardt, Alex, Leslie M. Blaha, Bethany Schneider Jurs, Gillian Rhodes, Linda Jeffery, Dean Wyatte, Jordan DeLong e Tom Busey. "Adaptation modulates the electrophysiological substrates of perceived facial distortion: Support for opponent coding". Neuropsychologia 48, n. 13 (novembre 2010): 3743–56. http://dx.doi.org/10.1016/j.neuropsychologia.2010.08.016.

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Honglei, Su, Liu Qi, Gong Hao, Wang Xiaohui, Yang Huan e Pan Zhenkuan. "Content-based bitrate model for perceived compression distortion evaluation of mobile video services". IET Image Processing 11, n. 11 (1 novembre 2017): 1027–33. http://dx.doi.org/10.1049/iet-ipr.2017.0318.

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35

Zhang, Yi, Thien D. Phan e Damon M. Chandler. "Reduced-reference image quality assessment based on distortion families of local perceived sharpness". Signal Processing: Image Communication 55 (luglio 2017): 130–45. http://dx.doi.org/10.1016/j.image.2017.03.020.

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36

Gardner, Rick M., Leifann C. Jones e Eric D. Bokenkamp. "Comparison of Three Psychophysical Techniques for Estimating Body-Size Perception". Perceptual and Motor Skills 80, n. 3_suppl (giugno 1995): 1379–90. http://dx.doi.org/10.2466/pms.1995.80.3c.1379.

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Abstract (sommario):

Perception of body size was recorded for 63 university students ( M age = 25.3 yr., 41 women) who estimated their own body size using three methods. Using the method of adjustment, subjects over- or underestimated their body size. A signal-detection analysis indicated that subjects were sensitive to detecting a 4% distortion in body size and that there was no systematic bias for reporting distortion as present or absent. Scores on the adaptive probit estimation task were significantly correlated with values for point of subjective equality and the size judgements with the method of adjustment. Over-all, this experiment demonstrated adaptive probit estimation as a reliable indicator of perceived body size, sensitivity in detecting size distortion, and response bias in making body-size judgements.

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PADMANABHAN, T. "SECRET LIFE OF THE SPACETIME". International Journal of Modern Physics D 21, n. 11 (ottobre 2012): 1241005. http://dx.doi.org/10.1142/s0218271812410052.

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Abstract (sommario):

Just as the thermal properties of normal matter demands the existence of microscopic degrees of freedom, the thermal properties of null surfaces — perceived as local Rindler horizons by accelerated observers — demands the existence of microscopic degrees of freedom to spacetime. The distortion of the null surfaces, just like the deformation of an elastic solid, costs entropy. I show how, just like in the case of an elastic solid, one can describe the dynamics of the spacetime solid by introducing an entropy density to the distortion of null surfaces in the spacetime.

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38

Sazzad, Z. M. Parvez, Roushain Akhter, J. Baltes e Y. Horita. "Objective No-Reference Stereoscopic Image Quality Prediction Based on 2D Image Features and Relative Disparity". Advances in Multimedia 2012 (2012): 1–16. http://dx.doi.org/10.1155/2012/256130.

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Abstract (sommario):

Stereoscopic images are widely used to enhance the viewing experience of three-dimensional (3D) imaging and communication system. In this paper, we propose an image feature and disparity dependent quality evaluation metric, which incorporates human visible system characteristics. We believe perceived distortions and disparity of any stereoscopic image are strongly dependent on local features, such as edge (i.e., nonplane areas of an image) and nonedge (i.e., plane areas of an image) areas within the image. Therefore, a no-reference perceptual quality assessment method is developed for JPEG coded stereoscopic images based on segmented local features of distortions and disparity. Local feature information such as edge and non-edge area based relative disparity estimation, as well as the blockiness and the edge distortion within the block of images are evaluated in this method. Subjective stereo image database is used for evaluation of the metric. The subjective experiment results indicate that our metric has sufficient prediction performance.

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Corke, Mike, Jason Bell, Stephanie C. Goodhew, Michael Smithson e Mark Edwards. "Perceived time slows during fleeting fun or fear". Quarterly Journal of Experimental Psychology 71, n. 2 (1 gennaio 2018): 562–67. http://dx.doi.org/10.1080/17470218.2016.1264000.

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Abstract (sommario):

Previous psychophysical studies at durations greater than 1000 ms have confirmed the anecdotal reports of an increase in the perceived duration of both positively and negatively valenced emotive stimuli; however, the results of studies at durations less than 1000 ms have been inconsistent. This study further investigated the effect of valence on the perception of durations less than 1000 ms. We used both positively and negatively valenced stimuli in order to compare their effects on the distortion of duration, and we tested multiple data points within the sub-one-second range. We found an increase in the perceived duration of both positively and negatively valenced emotional stimuli at all data points. This is consistent with studies at durations longer than 1000 ms and also with models of temporal processing. We also confirmed that Weber fractions, within the range tested, followed the generalized form of Weber’s law.

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40

Hazra, S., D. Williams, R. Roy e R. Aylmore. "Detecting subtle cosmetic defects in automotive skin panels". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, n. 11 (1 novembre 2008): 2203–7. http://dx.doi.org/10.1243/09544062jmes910.

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Abstract (sommario):

Cosmetic defects, such as ‘hollows’, are deviations in topology of automotive skin panels that form as a result of springback at the end of the forming process. These deviations are usually too small and local to be detected by discrete measurements of the panel but become visually apparent after the application of paint. As a result, the perceived quality of a panel may become unacceptable and considerable time may be dedicated to minimizing their occurrence through tool modifications. This paper proposes that there are three aspects to the problem. The first is the springback of the panel, the second is the optics of the painted panel, and the third is the ability of human sight to perceive a defect. In particular, it is argued that hollows cause optical distortions that inform the human eye of the presence of a defect. The paper then suggests that signal processing techniques, in particular the wavelet transform, provide a way to relate the geometry of a hollow to the resulting optical distortion. The transform was applied to two physical parts and the paper will discuss the effectiveness of the transform in locating and quantifying the relative severities of the defects that were present.

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Layek, Md, A. Uddin, Tuyen Le, TaeChoong Chung e Eui-Nam Huh. "Center-Emphasized Visual Saliency and a Contrast-Based Full Reference Image Quality Index". Symmetry 11, n. 3 (26 febbraio 2019): 296. http://dx.doi.org/10.3390/sym11030296.

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Abstract (sommario):

Objective image quality assessment (IQA) is imperative in the current multimedia-intensive world, in order to assess the visual quality of an image at close to a human level of ability. Many parameters such as color intensity, structure, sharpness, contrast, presence of an object, etc., draw human attention to an image. Psychological vision research suggests that human vision is biased to the center area of an image and display screen. As a result, if the center part contains any visually salient information, it draws human attention even more and any distortion in that part will be better perceived than other parts. To the best of our knowledge, previous IQA methods have not considered this fact. In this paper, we propose a full reference image quality assessment (FR-IQA) approach using visual saliency and contrast; however, we give extra attention to the center by increasing the sensitivity of the similarity maps in that region. We evaluated our method on three large-scale popular benchmark databases used by most of the current IQA researchers (TID2008, CSIQ and LIVE), having a total of 3345 distorted images with 28 different kinds of distortions. Our method is compared with 13 state-of-the-art approaches. This comparison reveals the stronger correlation of our method with human-evaluated values. The prediction-of-quality score is consistent for distortion specific as well as distortion independent cases. Moreover, faster processing makes it applicable to any real-time application. The MATLAB code is publicly available to test the algorithm and can be found online at.

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TAMADA, Yasuaki, Masayuki SATO, Sachio NAKAMIZO, Michiaki KONDO e Masahiro ISHII. "APPARENT SHAPE DISTORTION INDUCED BY DISPARITY OR MOTION PARALLAX WHEN REVERSED DEPTH IS PERCEIVED". Transactions of Japan Society of Kansei Engineering 8, n. 3 (2009): 717–22. http://dx.doi.org/10.5057/jjske.8.717.

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43

Li, H. C. O. "Systematic distortion of perceived 3D path of a moving object during disconjugate eye movement". Journal of Vision 6, n. 6 (24 marzo 2010): 870. http://dx.doi.org/10.1167/6.6.870.

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44

Chappel, Roger, Belinda Schwerin e Kuldip Paliwal. "Phase distortion resulting in a just noticeable difference in the perceived quality of speech". Speech Communication 81 (luglio 2016): 138–47. http://dx.doi.org/10.1016/j.specom.2016.04.005.

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45

Shaffer, Dennis M., e Michael K. McBeath. "Naive Beliefs in Baseball: Systematic Distortion in Perceived Time of Apex for Fly Balls." Journal of Experimental Psychology: Learning, Memory, and Cognition 31, n. 6 (2005): 1492–501. http://dx.doi.org/10.1037/0278-7393.31.6.1492.

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46

Carkeet, Andrew, Joanne M. Wood, Kylie M. McNeill, Hamish J. McNeill, Joanna A. James e Leigh S. Holder. "The Enright phenomenon. Stereoscopic distortion of perceived driving speed induced by monocular pupil dilation". Journal of Optometry 10, n. 4 (ottobre 2017): 233–41. http://dx.doi.org/10.1016/j.optom.2016.08.001.

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47

Matamala-Gomez, Marta, Birgit Nierula, Tony Donegan, Mel Slater e Maria V. Sanchez-Vives. "Manipulating the Perceived Shape and Color of a Virtual Limb Can Modulate Pain Responses". Journal of Clinical Medicine 9, n. 2 (21 gennaio 2020): 291. http://dx.doi.org/10.3390/jcm9020291.

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Abstract (sommario):

Changes in body representation may affect pain perception. The effect of a distorted body image, such as the telescoping effect in amputee patients, on pain perception, is unclear. This study aimed to investigate whether distorting an embodied virtual arm in virtual reality (simulating the telescoping effect in amputees) modulated pain perception and anticipatory responses to pain in healthy participants. Twenty-seven right-handed participants were immersed in virtual reality and the virtual arm was shown with three different levels of distortion with a virtual threatening stimulus either approaching or contacting the virtual hand. We evaluated pain/discomfort ratings, ownership, and skin conductance responses (SCRs) after each condition. Viewing a distorted virtual arm enhances the SCR to a threatening event with respect to viewing a normal control arm, but when viewing a reddened-distorted virtual arm, SCR was comparatively reduced in response to the threat. There was a positive relationship between the level of ownership over the distorted and reddened-distorted virtual arms with the level of pain/discomfort, but not in the normal control arm. Contact with the threatening stimulus significantly enhances SCR and pain/discomfort, while reduced SCR and pain/discomfort were seen in the simulated-contact condition. These results provide further evidence of a bi-directional link between body image and pain perception.

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48

Borgmann, B., M. Hebel, M. Arens e U. Stilla. "USAGE OF MULTIPLE LIDAR SENSORS ON A MOBILE SYSTEM FOR THE DETECTION OF PERSONS WITH IMPLICIT SHAPE MODELS". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2 (30 maggio 2018): 125–31. http://dx.doi.org/10.5194/isprs-archives-xlii-2-125-2018.

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Abstract (sommario):

The focus of this paper is the processing of data from multiple LiDAR (light detection and ranging) sensors for the purpose of detecting persons in that data. Many LiDAR sensors (e.g., laser scanners) use a rotating scan head, which makes it difficult to properly timesynchronize multiple of such LiDAR sensors. An improper synchronization between LiDAR sensors causes temporal distortion effects if their data are directly merged. A merging of data is desired, since it could increase the data density and the perceived area. For the usage in person and object detection tasks, we present an alternative which circumvents the problem by performing the merging of multi-sensor data in the voting space of a method that is based on Implicit Shape Models (ISM). Our approach already assumes that there exist some uncertainties in the voting space. Therefore it is robust against additional uncertainties induced by temporal distortions. Unlike many existing approaches for object detection in 3D data, our approach does not rely on a segmentation step in the data preprocessing. We show that our merging of multi-sensor information in voting space has its advantages in comparison to a direct data merging, especially in situations with a lot of distortion effects.

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de Minzi, Maria Cristina Richaud. "Childrens' Perceptions of Parents' and Peers' Behavior". Perceptual and Motor Skills 86, n. 1 (febbraio 1998): 289–90. http://dx.doi.org/10.2466/pms.1998.86.1.289.

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Abstract (sommario):

A significant association between the way 70 5-yr.-old children perceived relations with their parents and the distortion of perception of feeling accepted or rejected by the peers makes evident the necessity to analyze the perception of interpersonal relationships in childhood from the perspective of all persons involved.

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50

Yamashita, Hirofumi, Tomohiko Nishigami, Akira Mibu, Katsuyoshi Tanaka, Masahiro Manfuku, Hikaru Fukuhara, Koichi Yoshino, Yoichi Seto e Benedict M. Wand. "Perceived Body Distortion Rather Than Actual Body Distortion Is Associated With Chronic Low Back Pain in Adults With Cerebral Palsy: A Preliminary Investigation". Pain Practice 19, n. 8 (14 ottobre 2019): 826–35. http://dx.doi.org/10.1111/papr.12815.

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