Academic literature on the topic 'Pixels – Mouvements'
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Journal articles on the topic "Pixels – Mouvements":
Maurial, Sandrine. "Les virtus de l’image ou les puissances du pixel." Figures de l'Art. Revue d'études esthétiques 11, no. 1 (2006): 187–96. http://dx.doi.org/10.3406/fdart.2006.1411.
Daval, Vincent, Lâmân Lelégard, and Mathieu Bredif. "Correction du flou de mouvement sur des images prises de nuit depuis un véhicule de numérisation terrestre." Revue Française de Photogrammétrie et de Télédétection, no. 215 (August 16, 2017): 53–64. http://dx.doi.org/10.52638/rfpt.2017.354.
Dissertations / Theses on the topic "Pixels – Mouvements":
Ammour, Luis. "Développement d'une sonde intracérébrale à pixels actifs pour l'imagerie bêta du cerveau du rat libre de ses mouvements." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS497/document.
Over the last 20 years, many animal models have emerged, allowing the development of new approaches for the preclinical study of the healthy and pathological brain. Rodents have become key players in therapeutic advances. In this context, radioisotope imaging, which quantifies radioactive tracers with excellent sensitivity, is a prime tool for the study of brain processes in vivo. But so far, the most common radioimaging techniques require anesthesia or immobilization of the animal. However, anesthetics affect the biological processes studied. In addition, there is a keen interest in the simultaneous study of the behavior of the animal. The acquisition of a dynamic image of brain processes concomitant with the behavior of the awake and freely moving animal is valuable information for the study of addiction, memory, etc.At IMNC lab, we have approached behavioral neuroimaging with an original method based on intracerebral probes that measure the concentration of the radioactive tracer by direct detection of positrons in situ. The PIXSIC probe, based on a pixelized sensor with silicon diodes, demonstrated their relevance in the context of pharmacological studies with completely freely moving animals. However, PIXSIC has shown some limitations for its longitudinal use: a high level of noise due to electromagnetic perturbations, a high sensitivity to annihilation gamma radiation and a high mechanical fragility of the implant thinned to 200 microns.Based on the advent of CMOS technologies for the detection of charged particles in high energy physics, our ambition is to design MAPSSIC, a probe that responds to the difficulties highlighted by PIXSIC. CMOS sensors allows amplification at the pixel level, thus limiting electromagnetic noise. The sensitive volume can be reduced to a thickness of a few tens of microns, thus greatly reducing the sensitivity to gammas and allowing the increase of its total thickness to ensure its mechanical robustness. Finally, CMOS sensors allows us to design a highly pixelated detector to reach new imaging capabilities. This thesis aims to develop an optimized version of the probe. We imagined a first prototype CMOS sensor and we developed a Monte Carlo model to estimate its detection properties. We were able to show that his performances qualified it for the intended use, in terms of sensitivity, isoefficiency volume and deposited energy. We have also been able to explore several optimization parameters, the pixel dimensions and the thickness of the sensitive area, which allow us to consider MAPSSIC beyond the first prototype. With these theoretical bases we have produced several copies of the sensor. The developments that were established during the thesis then focused on a set of methodological tools, software and hardware to allow the physical characterization of the sensor using radioactive sources. We have been able to establish the uniformity of the pixel response and the event rate range ensuring the linearity of the count rate.These elements allowed us to conclude on the relevance of this sensor for the design of an autonomous imaging device. This consists of an implant made of two back-to-back sensors, an electronic system providing sensor control, signal reading and wireless communication and an acquisition station. In the context of the thesis, we have shown its suitability for the evaluation of the variations of the activity of a liquid beta+ radioactive source in which the implant has been immersed
Chabib, Ahmed. "Optical flow methods for the pixel-wise measurement of fields in solid mechanics." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILN003.
During mechanical tests, the materials undergo strain, often non-uniform and complex to measure precisely. This is particularly the case when the material under study shows local variations in its properties, as is the case with composite materials, or in the presence of singularity like cracks. The optical methods for the full-field measurement such as the Digital Image Correlation (DIC) widely used in mechanics help to overcome this lack. The community of Optical Flow in image analysis shares the same objective as the DIC by targeting the motion of each pixel, but these methods are rarely used in our community. This dissertation work aims to prove the efficiency and the relevance of some optical flow configurations for estimating quantities of interest in mechanics, in particular the strain.In the first stage, we present the interest of Optical Flow which will be repositioned in relation to the existing methods of DIC. If L2 is omnipresent in DIC, several metrics have been studied in the optical flow for the calculation of the displacement field. The objective is to avoid the over-smoothing effect on discontinuities. This dissertation inspects the effect of some of these metrics (Charbonier and Lorentz) over the restitution of discontinuities and strain. We show that Lorentz function can provide satisfactory results while the Charbonnier encourages the appearance of some parasitic cracks in the fields. With the help of an image mask containing different values of regularization, we show that we can force the emergence of local phenomenons while maintaining the homogeneity of the solution.The rapid acquisition of kinematic fields holds paramount importance, as we aim to advance towards 'smart testing' for instance. Thus, the last purpose of this dissertation is the generation of a pixel-wise code of image correlation, GPU-accelerated and easy to understand and modify. Our open source code was used for different applications such as the calibration of a stereo-correlation system.Finally, efforts have been made to improve the Conjugate Gradient, a linear solver of Krylov essential for solving large-scale symmetric and positive-definite systems, by employing a preconditionner guided by the regularization of Tikhonov and by taking the advantage of Ritz values for filtering and recycling the digital information in order to adjust regularization
Tran, Thi Thuy Ha. "Interpolation temporelle des images avec estimation de mouvement raffinée basée pixel et réduction de l'effet de halo." Thèse, Université de Sherbrooke, 2010. http://savoirs.usherbrooke.ca/handle/11143/1954.
Ionescu, Rǎzvan Andrei. "Détection et rehaussement des informations par réalignement et interpolation en imagerie médicale : application pour des séquences d'images cérébrales vasculaires en IRM." Compiègne, 2002. http://www.theses.fr/2002COMP1403.
Navarro, David. "Architecture et Conception de Rétines Silicium CMOS : Application à la mesure du flot optique." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2003. http://tel.archives-ouvertes.fr/tel-00164035.
d'une recherche de ce codage dans une fenêtre de destination potentielle. Cette approche est novatrice car elle propose une rétine CMOS pouvant traiter (électroniquement) des scènes fortement texturées, et à luminosité changeante, en s'appuyant sur une méthode jusqu'alors réservée aux approches numériques (FPGA, DSP) ou logicielles.
Nawaf, Mohamad Motasem. "3D structure estimation from image stream in urban environment." Thesis, Saint-Etienne, 2014. http://www.theses.fr/2014STET4024/document.
In computer vision, the 3D structure estimation from 2D images remains a fundamental problem. One of the emergent applications is 3D urban modelling and mapping. Here, we are interested in street-level monocular 3D reconstruction from mobile vehicle. In this particular case, several challenges arise at different stages of the 3D reconstruction pipeline. Mainly, lacking textured areas in urban scenes produces low density reconstructed point cloud. Also, the continuous motion of the vehicle prevents having redundant views of the scene with short feature points lifetime. In this context, we adopt the piecewise planar 3D reconstruction where the planarity assumption overcomes the aforementioned challenges.In this thesis, we introduce several improvements to the 3D structure estimation pipeline. In particular, the planar piecewise scene representation and modelling. First, we propose a novel approach that aims at creating 3D geometry respecting superpixel segmentation, which is a gradient-based boundary probability estimation by fusing colour and flow information using weighted multi-layered model. A pixel-wise weighting is used in the fusion process which takes into account the uncertainty of the computed flow. This method produces non-constrained superpixels in terms of size and shape. For the applications that imply a constrained size superpixels, such as 3D reconstruction from an image sequence, we develop a flow based SLIC method to produce superpixels that are adapted to reconstructed points density for better planar structure fitting. This is achieved by the mean of new distance measure that takes into account an input density map, in addition to the flow and spatial information. To increase the density of the reconstructed point cloud used to performthe planar structure fitting, we propose a new approach that uses several matching methods and dense optical flow. A weighting scheme assigns a learned weight to each reconstructed point to control its impact to fitting the structure relative to the accuracy of the used matching method. Then, a weighted total least square model uses the reconstructed points and learned weights to fit a planar structure with the help of superpixel segmentation of the input image sequence. Moreover, themodel handles the occlusion boundaries between neighbouring scene patches to encourage connectivity and co-planarity to produce more realistic models. The final output is a complete dense visually appealing 3Dmodels. The validity of the proposed approaches has been substantiated by comprehensive experiments and comparisons with state-of-the-art methods
Books on the topic "Pixels – Mouvements":
Jähne, Bernd. Digital image processing: Concepts, algorithms, and scientific applications. Berlin: Springer-Verlag, 1991.
Jähne, Bernd. Digital image processing. 6th ed. Berlin: Springer, 2005.
Jähne, Bernd. Digital image processing: Concepts, algorithms, and scientific applications. 4th ed. Berlin: Springer, 1997.
Jähne, Bernd. Digital image processing: Concepts, algorithms, and scientific applications. 3rd ed. Berlin: Springer-Verlag, 1995.
Jähne, Bernd. Digital image processing: Concepts, algorithms, and scientific applications. 2nd ed. Berlin: Springer-Verlag, 1993.