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Autore: Grafiati

Pubblicato: 8 giugno 2024

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1

Hands, D. S., M. D. Brotherton, A. Bourret e D. Bayart. "Subjective quality assessment for objective quality model development". Electronics Letters 41, n. 7 (2005): 408. http://dx.doi.org/10.1049/el:20058339.

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Orwig, Russell L., e Michael D. Fimmen. "Quality of Life Comparison: Objective Assessment versus Subjective Assessment". Journal of Baccalaureate Social Work 11, n. 1 (1 settembre 2005): 30–39. http://dx.doi.org/10.18084/1084-7219.11.1.30.

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Abstract (sommario):

Quality of life assessment has been proposed as a possible research tool for evaluating the life experiences of individuals in different cultures. The bulk of the literature on quality of life recognizes the existence of two separate but related measures of quality of life: objective measures (tangible and observable measures) and subjective measures (cognitive assessment or satisfaction with existing tangibles). The question is whether the subjective and objective measure of general quality of life of one culture can be used to assess or predict the quality of life in another. The current investigation suggests quality of life is best assessed within the context of the culture in which the individual resides and makes recommendations for social work education to reinforce cultural sensitivity through study abroad in order to prepare future social workers to meet the social service demands in a globalized world.

3

Dumic, Emil, e Luis A. da Silva Cruz. "Point Cloud Coding Solutions, Subjective Assessment and Objective Measures: A Case Study". Symmetry 12, n. 12 (26 novembre 2020): 1955. http://dx.doi.org/10.3390/sym12121955.

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This paper presents a summary of recent progress in compression, subjective assessment and objective quality measures of point cloud representations of three dimensional visual information. Different existing point cloud datasets, as well as discusses the protocols that have been proposed to evaluate the subjective quality of point cloud data. Several geometry and attribute point cloud data objective quality measures are also presented and described. A case study on the evaluation of subjective quality of point clouds in two laboratories is presented. Six original point clouds degraded with G-PCC and V-PCC point cloud compression and five degradation levels were subjectively evaluated, showing high inter-laboratory correlation. Furthermore, performance of several geometry-based objective quality measures applied to the same data are described, concluding that the highest correlation with subjective scores is obtained using point-to-plane measures. Finally, several current challenges and future research directions on point clouds compression and quality evaluation are discussed.

4

Park, Hyung-Ju, e Dong-Hwan Har. "Correlation Research between Objective and Subjective Image Quality Assessment". Journal of the Korea Contents Association 11, n. 8 (28 agosto 2011): 68–76. http://dx.doi.org/10.5392/jkca.2011.11.8.068.

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5

Shrestha, Prarthana, Rik Kneepkens, Gijs van Elswijk, Jeroen Vrijnsen, Roxana Ion, Dirk Verhagen, Esther Abels, Dirk Vossen e and Bas Hulsken. "Objective and Subjective Assessment of Digital Pathology Image Quality". AIMS Medical Science 2, n. 1 (2015): 65–78. http://dx.doi.org/10.3934/medsci.2015.1.65.

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6

Zerman, Emin, Pan Gao, Cagri Ozcinar e Aljosa Smolic. "Subjective and Objective Quality Assessment for Volumetric Video Compression". Electronic Imaging 2019, n. 10 (13 gennaio 2019): 323–1. http://dx.doi.org/10.2352/issn.2470-1173.2019.10.iqsp-323.

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7

Mytiai, Yurii Oleksandrovych, Kseniia Serhiivna Zamsha, Bohdan Valentynovych Lozinskyi, Olena Stepanivna Stepanovska e Arkadii Mykolaiovych Prodeus. "Objective and subjective assessment of bandlimited signaling speech quality". Electronics and Communications 21, n. 1 (16 novembre 2016): 18–26. http://dx.doi.org/10.20535/2312-1807.2016.21.1.82250.

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8

Cheng, Shan, Huanqiang Zeng, Jing Chen, Junhui Hou, Jianqing Zhu e Kai-Kuang Ma. "Screen Content Video Quality Assessment: Subjective and Objective Study". IEEE Transactions on Image Processing 29 (2020): 8636–51. http://dx.doi.org/10.1109/tip.2020.3018256.

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9

Duanning Zhou, Jian Ma e E. Turban. "Journal quality assessment: an integrated subjective and objective approach". IEEE Transactions on Engineering Management 48, n. 4 (2001): 479–90. http://dx.doi.org/10.1109/17.969425.

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10

Beerends, John G., Niels M. P. Neumann, Egon L. van den Broek, Anna Llagostera Casanovas, Jovana Torres Menendez, Christian Schmidmer e Jens Berger. "Subjective and Objective Assessment of Full Bandwidth Speech Quality". IEEE/ACM Transactions on Audio, Speech, and Language Processing 28 (2020): 440–49. http://dx.doi.org/10.1109/taslp.2019.2957871.

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11

Dziedzoave, N. T., W. O. Ellis, J. H. Oldham e A. Osei-Yaw. "Subjective and objective assessment of `agbelima' (cassava dough) quality". Food Control 10, n. 2 (aprile 1999): 63–67. http://dx.doi.org/10.1016/s0956-7135(98)00153-4.

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Emiya, Valentin, Emmanuel Vincent, Niklas Harlander e Volker Hohmann. "Subjective and Objective Quality Assessment of Audio Source Separation". IEEE Transactions on Audio, Speech, and Language Processing 19, n. 7 (settembre 2011): 2046–57. http://dx.doi.org/10.1109/tasl.2011.2109381.

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Seshadrinathan, Kalpana, Rajiv Soundararajan, Alan Conrad Bovik e Lawrence K. Cormack. "Study of Subjective and Objective Quality Assessment of Video". IEEE Transactions on Image Processing 19, n. 6 (giugno 2010): 1427–41. http://dx.doi.org/10.1109/tip.2010.2042111.

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14

Kosztyła-Hojna, Bożena, Anna Łobaczuk-Sitnik, Jolanta Biszewska e Diana Moskal-Jasińska. "Subjective and objective assessment of voice quality in pregnancy". Otolaryngologia Polska 72, n. 6 (14 dicembre 2018): 1–5. http://dx.doi.org/10.5604/01.3001.0012.7856.

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Abstract (sommario):

During pregnancy, voice quality disorders may occur in form of: edema, dryness, nervousness. The aim of the study is subjective and objective evaluation of voice quality in pregnant women. The study included 20 women in the third trimester of pregnancy, age of 20-31 diagnosed at the Department of Clinical Phonoaudiology and Logopedics, Medical University of Bialystok. Subjective assessment has been based on the GRBAS scale. Objective assessment of the vocal organ used the HSDI technique (High Speed Digital Imaging). In the laryngeal visualization, high-speed camera (HS) using rigid endoscope with 90 ° optics has been used. Vibration of vocal folds has been recorded during phonation of vowel "e" at 4000 frames / sec. The glottal closure (GTs), symmetry, regularity and synchronization of vocal folds vibration have been assessed. In estimating the degree of glottal insufficiency, kymography of the larynx has been performed by analyzing the value of Open Quotient (OQ). Objective acoustic evaluation of voice has been also conducted using DiagnoScope Specjalista Program. Hoarseness has been observed in 15 pregnant women, whereas voice fatigability in 20 patients. Using HSDI, the edema of vocal folds in part of the group has been observed. Decreased MPT has been found in all examined women in the third trimester of pregnancy. Hoarseness and fatigability of voice are the most frequent subjective symptoms of voice organ in the third trimester of pregnancy. Decreased MPT is recorded objectively, as well as edema and insufficiency of vocal folds using HSDI technique.

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Shahkolaei, Atena, Hossein Ziaei Nafchi, Somaya Al-Maadeed e Mohamed Cheriet. "Subjective and objective quality assessment of degraded document images". Journal of Cultural Heritage 30 (marzo 2018): 199–209. http://dx.doi.org/10.1016/j.culher.2017.10.001.

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Good, Walter F., David Gur, John H. Feist, F. Leland Thaete, Carl R. Fuhrman, Cynthia A. Britton e B. Simon Slasky. "Subjective and objective assessment of image quality—A comparison". Journal of Digital Imaging 7, n. 2 (maggio 1994): 77–78. http://dx.doi.org/10.1007/bf03168426.

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Park, Hyung-ju, e Dong-hwan Har. "Subjective image quality assessment based on objective image quality measurement factors". IEEE Transactions on Consumer Electronics 57, n. 3 (agosto 2011): 1176–84. http://dx.doi.org/10.1109/tce.2011.6018872.

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Zhang, Huiqing, Donghao Li, Yibing Yu e Nan Guo. "Subjective and Objective Quality Assessments of Display Products". Entropy 23, n. 7 (26 giugno 2021): 814. http://dx.doi.org/10.3390/e23070814.

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Abstract (sommario):

In recent years, people’s daily lives have become inseparable from a variety of electronic devices, especially mobile phones, which have undoubtedly become necessity in people’s daily lives. In this paper, we are looking for a reliable way to acquire visual quality of the display product so that we can improve the user’s experience with the display product. This paper proposes two major contributions: the first one is the establishment of a new subjective assessment database (DPQAD) of display products’ screen images. Specifically, we invited 57 inexperienced observers to rate 150 screen images showing the display product. At the same time, in order to improve the reliability of screen display quality score, we combined the single stimulation method with the stimulation comparison method to evaluate the newly created display products’ screen images database effectively. The second one is the development of a new no-reference image quality assessment (IQA) metric. For a given image of the display product, first our method extracts 27 features by analyzing the contrast, sharpness, brightness, etc., and then uses the regression module to obtain the visual quality score. Comprehensive experiments show that our method can evaluate natural scene images and screen content images at the same time. Moreover, compared with ten state-of-the-art IQA methods, our method shows obvious superiority on DPQAD.

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Deb, Saikat, e Mokaddes Ali Ahmed. "Quality assessment of city bus service based on subjective and objective service quality dimensions". Benchmarking: An International Journal 26, n. 2 (4 marzo 2019): 567–89. http://dx.doi.org/10.1108/bij-11-2017-0309.

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PurposeThe purpose of this paper is to estimate and compare the service quality of the city bus service measured by two different approaches which are subjective service quality dimensions and objective service quality dimensions.Design/methodology/approachThe objective service quality dimensions have been estimated based on the benchmarking technique provided by the Ministry of Urban Development, India. For the analysis of subjective service quality dimensions, a questionnaire survey has been conducted to measure the users’ satisfaction and dissatisfaction about the service. The questionnaire consists of users’ socioeconomic characteristics and 23 questions related to city bus service quality dimensions. Questionnaire data have been analyzed by factor analysis, regression analysis and path analysis to find out the indicators representing subjective service quality dimensions. Finally, the overall service quality of the bus service has been determined based on both the measures.FindingsThe study indicates that the overall service quality of the bus service is different for subjective and objective analyses. While the objective measures show that the service quality is very good, the subjective measures indicate that the service is not doing well.Research limitations/implicationsThe analysis of the subjective dimensions is complicated. Analysis of the subjective dimensions needed more expertise and resources than the objective analysis.Originality/valueIn this study, the estimated service quality of the bus service is more reliable than the other methods as it comprises of both operators’ perspective and passengers’ expectations from the service.

20

Shi, Ran, Jing Ma, King Ngi Ngan, Jian Xiong e Tong Qiao. "Objective Object Segmentation Visual Quality Evaluation: Quality Measure and Pooling Method". ACM Transactions on Multimedia Computing, Communications, and Applications 18, n. 3 (31 agosto 2022): 1–19. http://dx.doi.org/10.1145/3491229.

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Objective object segmentation visual quality evaluation is an emergent member of the visual quality assessment family. It aims to develop an objective measure instead of a subjective survey to evaluate the object segmentation quality in agreement with human visual perception. It is an important benchmark for assessing and comparing the performances of object segmentation methods in terms of visual quality. Despite its essential role, sufficient study compared with other visual quality evaluation studies is still lacking. In this article, we propose a novel full-reference objective measure that includes a two-level single object segmentation visual quality measure and a pooling method for multiple object segmentation overall visual quality. The single object segmentation visual quality measure combines a pixel-level sub-measure and a region-level sub-measure for evaluating the similarity of area, shape, and object completeness between the segmentation result and the ground truth in terms of human visual perception. For the proposed multiple object segmentation overall visual quality pooling method, the rank of each object’s segmentation quality as a novel factor is integrated into the weighted harmonic mean to evaluate the overall quality. To evaluate the performance of our proposed measure, we tested it on an object segmentation subjective visual quality assessment database. The experimental results demonstrate that our proposed two-level measure and pooling method with good robustness perform better in matching subjective assessments compared with other state-of-the-art objective measures.

21

Stewart, Michael G., e Timothy L. Smith. "Objective versus Subjective Outcomes Assessment in Rhinology". American Journal of Rhinology 19, n. 5 (settembre 2005): 529–35. http://dx.doi.org/10.1177/194589240501900518.

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Background Prior studies on the relationship between computed tomography scan findings and patient-based quality of life in chronic rhinosinusitis (CRS) have found very low correlations. Whereas surprising, similar findings have been noted in other diseases. Methods We performed a cross-sectional analysis of the association between objective and subjective findings in nasal septal deformity and a systematic review and synthesis of the literature on CRS and other diseases. Results We found no association between objective anatomic findings and subjective symptoms in nasal obstruction (R = 0.03; Kruskal–Wallis test, p = 0.97). Multiple studies in CRS and other diseases—sleep apnea, hearing loss, asthma, etc.—have found similarly low correlations between objective and subjective testing. Conclusion For nasal septal deviation and CRS, the patient's subjective perception of disease severity has, at best, a very weak association with objective assessment of severity. Patient-based outcomes assessment remains important; these instruments apparently quantify an aspect of disease not detected by objective testing.

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Madhusudana, Pavan C., Xiangxu Yu, Neil Birkbeck, Yilin Wang, Balu Adsumilli e Alan C. Bovik. "Subjective and Objective Quality Assessment of High Frame Rate Videos". IEEE Access 9 (2021): 108069–82. http://dx.doi.org/10.1109/access.2021.3100462.

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Guo, Jinjiang, Vincent Vidal, Irene Cheng, Anup Basu, Atilla Baskurt e Guillaume Lavoue. "Subjective and Objective Visual Quality Assessment of Textured 3D Meshes". ACM Transactions on Applied Perception 14, n. 2 (20 febbraio 2017): 1–20. http://dx.doi.org/10.1145/2996296.

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Wang, Shiqi, Ke Gu, Xiang Zhang, Weisi Lin, Li Zhang, Siwei Ma e Wen Gao. "Subjective and Objective Quality Assessment of Compressed Screen Content Images". IEEE Journal on Emerging and Selected Topics in Circuits and Systems 6, n. 4 (dicembre 2016): 532–43. http://dx.doi.org/10.1109/jetcas.2016.2598756.

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Xiang, Tao, Ying Yang e Shangwei Guo. "Blind Night-Time Image Quality Assessment: Subjective and Objective Approaches". IEEE Transactions on Multimedia 22, n. 5 (maggio 2020): 1259–72. http://dx.doi.org/10.1109/tmm.2019.2938612.

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Chen, Shouning, Baoyu Zheng e Yujuan Zhao. "Hierarchical Objective Quality Assessment for CS Video in WMSN". International Journal of Distributed Sensor Networks 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/237565.

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Abstract (sommario):

Compressive sensing (CS) is a sub-Nyquist sampling way while still enabling exact reconstruction, which is applicable to WMSN. In this paper, based on the characteristic of CS video in WMSN, we proposed a hierarchical objective CS video quality assessment (HOCSVQA) approach to get CS video quality index (CSVQI) from three levels, measurement level, stream level, and packet level, respectively. This approach cannot only keep the convenience and real-time characteristic of objective video assessment, but also reflect the QoE to a certain extent due to the coefficients regressed from subjective video assessment experiments. A set of experiments on subjective CS video quality assessment and another set of verification experiments are designed and settled. The CS video quality index, CSVQI, assessed by the model we proposed maintained a high correlation with data from verification experiments under statistical correlation measure.

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Stanojevic, Danilo, Boban Bondzulic, Boban Pavlovic e Vladimir Petrovic. "The impact of quality of service parameters to the subjective and objective video quality assessment". Serbian Journal of Electrical Engineering 15, n. 1 (2018): 97–114. http://dx.doi.org/10.2298/sjee1801097s.

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This paper deals with the delay, delay variation - jitter, packet loss rate and bandwidth as quality of service parameters, in the form of four types of video quality degradations. The impact of defined levels of degradation on subjective impressions (given as mean opinion scores) is analyzed. ReTRiEVED video dataset with publicly available subjective scores is used in the analysis. Three full-reference measures are used for objective assessment of video quality. The degree of consistency of subjective and objective quality scores is shown through scatter plots and quantitative measures (linear correlation coefficient and correlation of the ranks). Based on the interpolation functions, quality of service parameters are mapped to subjective experience. We show that jitter is a much more destructive effect than other degradation types.

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Yang, Yang, Jun Ming e Nenghai Yu. "Color Image Quality Assessment Based on CIEDE2000". Advances in Multimedia 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/273723.

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Combining the color difference formula of CIEDE2000 and the printing industry standard for visual verification, we present an objective color image quality assessment method correlated with subjective vision perception. An objective score conformed to subjective perception (OSCSP)Qwas proposed to directly reflect the subjective visual perception. In addition, we present a general method to calibrate correction factors of color difference formula under real experimental conditions. Our experiment results show that the present DE2000-based metric can be consistent with human visual system in general application environment.

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Jamil, Sonain. "Review of Image Quality Assessment Methods for Compressed Images". Journal of Imaging 10, n. 5 (8 maggio 2024): 113. http://dx.doi.org/10.3390/jimaging10050113.

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Abstract (sommario):

The compression of images for efficient storage and transmission is crucial in handling large data volumes. Lossy image compression reduces storage needs but introduces perceptible distortions affected by content, compression levels, and display environments. Each compression method generates specific visual anomalies like blocking, blurring, or color shifts. Standardizing efficient lossy compression necessitates evaluating perceptual quality. Objective measurements offer speed and cost efficiency, while subjective assessments, despite their cost and time implications, remain the gold standard. This paper delves into essential research queries to achieve visually lossless images. The paper describes the influence of compression on image quality, appropriate objective image quality metrics (IQMs), and the effectiveness of subjective assessment methods. It also provides an overview of the existing literature, surveys, and subjective and objective image quality assessment (IQA) methods. Our aim is to offer insights, identify challenges in existing methodologies, and assist researchers in selecting the most effective assessment approach for their needs.

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Afnan, Afnan, Faiz Ullah, Yaseen Yaseen, Jinhee Lee, Sonain Jamil e Oh-Jin Kwon. "Subjective Assessment of Objective Image Quality Metrics Range Guaranteeing Visually Lossless Compression". Sensors 23, n. 3 (23 gennaio 2023): 1297. http://dx.doi.org/10.3390/s23031297.

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Abstract (sommario):

The usage of media such as images and videos has been extensively increased in recent years. It has become impractical to store images and videos acquired by camera sensors in their raw form due to their huge storage size. Generally, image data is compressed with a compression algorithm and then stored or transmitted to another platform. Thus, image compression helps to reduce the storage size and transmission cost of the images and videos. However, image compression might cause visual artifacts, depending on the compression level. In this regard, performance evaluation of the compression algorithms is an essential task needed to reconstruct images with visually or near-visually lossless quality in case of lossy compression. The performance of the compression algorithms is assessed by both subjective and objective image quality assessment (IQA) methodologies. In this paper, subjective and objective IQA methods are integrated to evaluate the range of the image quality metrics (IQMs) values that guarantee the visually or near-visually lossless compression performed by the JPEG 1 standard (ISO/IEC 10918). A novel “Flicker Test Software” is developed for conducting the proposed subjective and objective evaluation study. In the flicker test, the selected test images are subjectively analyzed by subjects at different compression levels. The IQMs are calculated at the previous compression level, when the images were visually lossless for each subject. The results analysis shows that the objective IQMs with more closely packed values having the least standard deviation that guaranteed the visually lossless compression of the images with JPEG 1 are the feature similarity index measure (FSIM), the multiscale structural similarity index measure (MS-SSIM), and the information content weighted SSIM (IW-SSIM), with average values of 0.9997, 0.9970, and 0.9970 respectively.

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Chen, Zhenzhong, e Han Zhu. "Visual Quality Evaluation for Semantic Segmentation: Subjective Assessment Database and Objective Assessment Measure". IEEE Transactions on Image Processing 28, n. 12 (dicembre 2019): 5785–96. http://dx.doi.org/10.1109/tip.2019.2922072.

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Zelmati, Omar, Boban Bondžulić, Boban Pavlović, Ivan Tot e Saad Merrouche. "Study of subjective and objective quality assessment of infrared compressed images". Journal of Electrical Engineering 73, n. 2 (1 aprile 2022): 73–87. http://dx.doi.org/10.2478/jee-2022-0011.

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Abstract Given the lack of accessible infrared compressed images’ benchmarks annotated by human subjects, this work presents a new database with the aim of studying both subjective and objective image quality assessment (IQA) on compressed long wavelength infrared (LWIR) images. The database contains 20 reference (pristine) images and 200 distorted (degraded) images obtained by application of the most known compression algorithms used in multimedia and communication fields, namely: JPEG and JPEG-2000. Each compressed image is evaluated by 31 subjects having different levels of experience in LWIR images. Mean opinion scores (MOS) and natural scene statistics (NSS) of pristine and compressed images are elaborated to study the performance of the database. Five analyses are conducted on collected images and subjective scores, namely: analysis by compression type, analysis by file size, analysis by reference image, analysis by quality level and analysis by subject. Moreover, a wide set of objective IQA metrics is applied on the images and the obtained scores are compared with the collected subjective scores. Results show that objective IQA measures correlate with human subjective results with a degree of agreement up to 95 %, so this benchmark is promising to improve existing and develop new IQA measures for compressed LWIR images. Thanks to a real-world surveillance original images based on which we analyze how image compression and quality level affect the quality of compressed images, this database is primarily suitable for (military and civilian) surveillance applications. The database is accessible via the link: https://github.com/azedomar/compressed-LWIR-images-IQA-database. As a follow-up to this work, an extension of the database is underway to study other types of distortion in addition to compression.

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Azevedo, Roberto G. de A., Neil Birkbeck, Ivan Janatra, Balu Adsumilli e Pascal Frossard. "Subjective and Viewport-based Objective Quality Assessment of 360-degree videos". Electronic Imaging 2020, n. 9 (26 gennaio 2020): 284–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.9.iqsp-284.

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Visual distortions in processed 360-degree visual content and consumed through head-mounted displays (HMDs) are perceived very differently when compared to traditional 2D content. To better understand how compression-related artifacts affect the overall perceived quality of 360-degree videos, this paper presents a subjective quality assessment study and analyzes the performance of objective metrics to correlate with the gathered subjective scores. In contrast to previous related work, the proposed study focuses on the equiangular cubemap projection and includes specific visual distortions (blur, blockiness, H.264 compression, and cubemap seams) on both monoscopic and stereoscopic sequences. The objective metrics performance analysis is based on metrics computed in both the projection domain and the viewports, which is closer to what the user sees. The results show that overall objective metrics computed on viewports are more correlated with the subjective scores in our dataset than the same metrics computed in the projection domain. Moreover, the proposed dataset and objective metrics analysis serve as a benchmark for the development of new perception-optimized quality assessment algorithms for 360-degree videos, which is still a largely open research problem.

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Wilson, Julie C., Corrine N. Seehusen, Stacey L. Simon e David R. Howell. "Title: CHANGES IN SUBJECTIVE AND OBJECTIVE SLEEP MEASURES DURING RECOVERY IN PEDIATRIC CONCUSSION". Orthopaedic Journal of Sports Medicine 9, n. 7_suppl3 (1 luglio 2021): 2325967121S0006. http://dx.doi.org/10.1177/2325967121s00060.

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Background: Sleep problems after concussion have been associated with longer recovery times and more severe symptoms. Early research has primarily evaluated sleep via subjective measures; however, actigraphy data may help objectively understand sleep patterns after pediatric concussion. Purposes: Our study examined changes in subjective and objective sleep measures during pediatric concussion recovery. We also evaluated whether sleep measures at initial assessment predict concussion symptom resolution time. Methods: Pediatric patients evaluated within 14 days of concussion were given a commercial activity tracker to be worn full-time, including during sleep, through return-to-play (RTP) clearance. During the initial and RTP assessments, patients completed the Pittsburgh Sleep Quality Index (PSQI), self-reporting sleep duration, time spent in bed, and sleep quality. PSQI score >5 indicates poor sleep quality. Activity tracker-recorded sleep duration and time spent in bed from the first 3 nights after initial assessment and 3 nights prior to the RTP clearance assessment were also used for analysis. Results: Patients (n=32, 15.1±1.7 years, 41% female) completed initial and RTP clearance assessments (Table 1). On the PSQI, patients reported significantly worse overall sleep quality despite longer sleep duration and more time in bed at initial assessment relative to RTP assessment (Table 2). A majority of patients reported PSQI score >5 at both initial and RTP assessments (Table 2). There were no significant differences across time for sleep duration or time in bed as measured by actigraphy (Table 2). Patients perceived that they spent longer in bed compared to objective measures with initial assessment, and perceived longer sleep duration compared to objective measures for both initial and RTP assessments (Table 3). In each regression model, higher symptom severity was significantly associated with longer symptom resolution time (Table 4). In addition, longer time in bed after the initial assessment measured by actigraphy was significantly associated with longer symptom resolution time (Table 4). Conclusion: Patients reported obtaining more sleep and spending longer time in bed at the initial assessment compared to actigraphy measures, and a majority of patients reported poor sleep quality throughout recovery. Concussion symptom duration increased by 1 day for every 13 additional minutes spent in bed, as measured by actigraphy. Increased time in bed may indicate poor sleep habits during recovery. Both subjective and objective assessment of sleep following concussion offer valuable, yet differing, information. Future research assessing the impact of sleep intervention after concussion on symptom resolution should be considered. [Table: see text][Table: see text][Table: see text][Table: see text]

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Madhusudana, Pavan Chennagiri, e Rajiv Soundararajan. "Subjective and Objective Quality Assessment of Stitched Images for Virtual Reality". IEEE Transactions on Image Processing 28, n. 11 (novembre 2019): 5620–35. http://dx.doi.org/10.1109/tip.2019.2921858.

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Min, Xiongkuo, Guangtao Zhai, Jiantao Zhou, Mylene C. Q. Farias e Alan Conrad Bovik. "Study of Subjective and Objective Quality Assessment of Audio-Visual Signals". IEEE Transactions on Image Processing 29 (2020): 6054–68. http://dx.doi.org/10.1109/tip.2020.2988148.

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Dixon, Timothy D., Eduardo Fernández Canga, Stavri G. Nikolov, Tom Troscianko, Jan M. Noyes, C. Nishan Canagarajah e Dave R. Bull. "Selection of image fusion quality measures: objective, subjective, and metric assessment". Journal of the Optical Society of America A 24, n. 12 (11 ottobre 2007): B125. http://dx.doi.org/10.1364/josaa.24.00b125.

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Wu, Qingbo, Lei Wang, King Ngi Ngan, Hongliang Li, Fanman Meng e Linfeng Xu. "Subjective and Objective De-Raining Quality Assessment Towards Authentic Rain Image". IEEE Transactions on Circuits and Systems for Video Technology 30, n. 11 (novembre 2020): 3883–97. http://dx.doi.org/10.1109/tcsvt.2020.2972566.

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Moorthy, Anush Krishna, Lark Kwon Choi, Alan Conrad Bovik e Gustavo de Veciana. "Video Quality Assessment on Mobile Devices: Subjective, Behavioral and Objective Studies". IEEE Journal of Selected Topics in Signal Processing 6, n. 6 (ottobre 2012): 652–71. http://dx.doi.org/10.1109/jstsp.2012.2212417.

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Maksimović-Moićević, Sanja, Željko Lukač e Miodrag Temerinac. "Objective estimation of subjective image quality assessment using multi-parameter prediction". IET Image Processing 13, n. 13 (14 novembre 2019): 2428–35. http://dx.doi.org/10.1049/iet-ipr.2018.6143.

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Torkhani, Fakhri, Kai Wang e Jean-Marc Chassery. "Perceptual quality assessment of 3D dynamic meshes: Subjective and objective studies". Signal Processing: Image Communication 31 (febbraio 2015): 185–204. http://dx.doi.org/10.1016/j.image.2014.12.008.

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Hu, Bo, Leida Li, Jinjian Wu e Jiansheng Qian. "Subjective and objective quality assessment for image restoration: A critical survey". Signal Processing: Image Communication 85 (luglio 2020): 115839. http://dx.doi.org/10.1016/j.image.2020.115839.

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Cao, Yuqin, Xiongkuo Min, Wei Sun e Guangtao Zhai. "Subjective and Objective Audio-Visual Quality Assessment for User Generated Content". IEEE Transactions on Image Processing 32 (2023): 3847–61. http://dx.doi.org/10.1109/tip.2023.3290528.

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Oszust, Mariusz. "No-Reference Image Quality Assessment with Local Gradient Orientations". Symmetry 11, n. 1 (16 gennaio 2019): 95. http://dx.doi.org/10.3390/sym11010095.

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Abstract (sommario):

Image processing methods often introduce distortions, which affect the way an image is subjectively perceived by a human observer. To avoid inconvenient subjective tests in cases in which reference images are not available, it is desirable to develop an automatic no-reference image quality assessment (NR-IQA) technique. In this paper, a novel NR-IQA technique is proposed in which the distributions of local gradient orientations in image regions of different sizes are used to characterize an image. To evaluate the objective quality of an image, its luminance and chrominance channels are processed, as well as their high-order derivatives. Finally, statistics of used perceptual features are mapped to subjective scores by the support vector regression (SVR) technique. The extensive experimental evaluation on six popular IQA benchmark datasets reveals that the proposed technique is highly correlated with subjective scores and outperforms related state-of-the-art hand-crafted and deep learning approaches.

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Zhang, Chun E., Fan Ci Guo e Ke Xiong. "Towards Subjective Consistency: An Effective Objective Quality Assessment Algorithm for Binary Image". Key Engineering Materials 474-476 (aprile 2011): 143–50. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.143.

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Abstract (sommario):

Image quality assessment plays an important role in various image processing applications. One of the challenges to objectively assess image quality is how to design an effective scheme to achieve high consistency with the classic subjective image assessment criterion, Mean Opinion Score (MOS). This work presents a novel objective assessment algorithm for binary images by considering three factors which have great influences on visual quality of binary images, i.e., structural change caused by noise point, isolated noise points, and gathering noise points. Experimental results show that our algorithm can achieve effective objective assessment results with higher consistency with the MOS criterion.

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ZHUK, Petro. "ASSESSMENT OF ENVIRONMENTAL SAFETY AS A COMPONENT OF QUALITY OF LIFE IN CROSS-BORDER SUBREGIONS". Economy of Ukraine 2021, n. 2 (20 febbraio 2021): 75–88. http://dx.doi.org/10.15407/economyukr.2021.02.075.

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Abstract (sommario):

The results of elaborations of available theoretical-analytical materials on measuring the quality of life are generalized, their orientation mainly on the assessment of the quality of life at the macro level for international comparisons is revealed. Methodical methods for assessing environmental safety as a component of quality of life at the level of administrative subregions of neighboring countries are substantiated and proposed: subjective assessment based on sociological research using questionnaires and objective assessment with a choice of representative, comparative, reliable assessment indicators, substantiation of their standards and calculations of environmental safety indices. The results are given of approbation of the proposed methods with coverage of subjective and obtained on the basis of quantitative indicators adapted to the system of official statistics of Ukraine and Poland objective assessments of the ecological component of quality of life in the studied cross-border subregions: Zhovkva, Sokal, Yavoriv districts of Lviv Oblast of Ukraine and Jaros?aw, Przemy?l, Lubacz?w Counties of the SubcarpathianVoivodeship of Poland. Significant disparities are identified not in favor of domestic subregions in the levels of environmental safety according to the results of objective assessment, which to some extent is smoothed in subjective assessment due to its dependence on the specific values and guidelines and environmental awareness of respondents. Conclusions are made on the complementarity of the results of subjective and objective environmental safety assessment, high value of the importance given by respondents to environmental safety as a component of quality of life, the impact of environmental safety asymmetry on the results of its subjective assessment, in particular, the priority of protection and preservation of certain components natural environment aimed at solving these problems.

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Gilski, Przemysław, e Jacek Stefański. "Subjective and Objective Comparative Study of DAB+ Broadcast System". Archives of Acoustics 42, n. 1 (1 marzo 2017): 3–11. http://dx.doi.org/10.1515/aoa-2017-0001.

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Abstract (sommario):

Abstract Broadcasting services seek to optimize their use of bandwidth in order to maximize user’s quality of experience. They aim to transmit high-quality digital speech and music signals at the lowest bitrate. They intend to offer the best quality under available conditions. Due to bandwidth limitations, audio quality is in conflict with the number of transmitted radio programs. This paper analyzes whether the quality of real-time digital DAB+ broadcasted radio programs surpasses the quality offered by analog FM radio. We also perform a subjective and objective quality assessment comparative study of the HE-AAC v2 audio codec used in DAB+. The subjective studies were carried out using the MOS test methodology, whereas the objective tests were realized using the ViSQOLAudio metric. These studies were followed by a questionnaire concerning the migration from analog to digital radio domain.

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Iai, Satoru, e Nobuhiko Kitawaki. "Special Edition Application for Subjective Asessment and Objective Measurement of Picture Quality. 1. Subjective Assessment Method of Picture Quality." Journal of the Institute of Television Engineers of Japan 46, n. 2 (1992): 129–33. http://dx.doi.org/10.3169/itej1978.46.129.

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Popova, N. V., O. I. Arsenina, M. V. Gavrilova e N. V. Glukhova. "Objective and subjective assessment of the quality and effectiveness of orthodontic treatment". Stomatologiya 100, n. 5 (2021): 82. http://dx.doi.org/10.17116/stomat202110005182.

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Moorthy, Anush Krishna, Kalpana Seshadrinathan, Rajiv Soundararajan e Alan Conrad Bovik. "Wireless Video Quality Assessment: A Study of Subjective Scores and Objective Algorithms". IEEE Transactions on Circuits and Systems for Video Technology 20, n. 4 (aprile 2010): 587–99. http://dx.doi.org/10.1109/tcsvt.2010.2041829.

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