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| Author |
Yasuko Sugito; Trevor Canham; Javier Vazquez; Marcelo Bertalmio |
| Title |
A Study of Objective Quality Metrics for HLG-Based HDR/WCG Image Coding |
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| Year |
2021 |
Publication |
SMPTE Motion Imaging Journal |
Abbreviated Journal |
SMPTE |
| Volume |
130 |
Issue |
4 |
Pages |
53 - 65 |
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| Abstract |
In this work, we study the suitability of high dynamic range, wide color gamut (HDR/WCG) objective quality metrics to assess the perceived deterioration of compressed images encoded using the hybrid log-gamma (HLG) method, which is the standard for HDR television. Several image quality metrics have been developed to deal specifically with HDR content, although in previous work we showed that the best results (i.e., better matches to the opinion of human expert observers) are obtained by an HDR metric that consists simply in applying a given standard dynamic range metric, called visual information fidelity (VIF), directly to HLG-encoded images. However, all these HDR metrics ignore the chroma components for their calculations, that is, they consider only the luminance channel. For this reason, in the current work, we conduct subjective evaluation experiments in a professional setting using compressed HDR/WCG images encoded with HLG and analyze the ability of the best HDR metric to detect perceivable distortions in the chroma components, as well as the suitability of popular color metrics (including ΔITPR , which supports parameters for HLG) to correlate with the opinion scores. Our first contribution is to show that there is a need to consider the chroma components in HDR metrics, as there are color distortions that subjects perceive but that the best HDR metric fails to detect. Our second contribution is the surprising result that VIF, which utilizes only the luminance channel, correlates much better with the subjective evaluation scores than the metrics investigated that do consider the color components. |
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SCV2021 |
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3671 |
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| Author |
A. Pujol; Juan J. Villanueva |
| Title |
A supervised Modification of the Hausdorff distance for visual shape classification |
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| Year |
2002 |
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International Journal of Pattern Recognition and Artificial Intelligence |
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16 |
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3 |
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349-359 |
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(IF: 0.359) |
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no |
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PuV2002 |
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273 |
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| Author |
Javier Varona; Antoni Jaume-i-Capo; Jordi Gonzalez; Francisco Jose Perales |
| Title |
Toward Natural Interaction through Visual Recognition of Body Gestures in Real-Time |
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| Year |
2008 |
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Interacting with Computers, diu 10,1016/j.intcom.2008.10.001, available on line |
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ISE @ ise @ VJG2008 |
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1022 |
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| Author |
Javier Varona; Jordi Gonzalez; Ignasi Rius; Juan J. Villanueva |
| Title |
Importance of Detection for Video Surveillance Applications |
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2008 |
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Optical Engineering, vol. 47(8), 087201/1–9 |
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ISE @ ise @ VGR2008 |
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998 |
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| Author |
Ignasi Rius; Jordi Gonzalez; Mikhail Mozerov; Xavier Roca |
| Title |
Automatic Learning of 3D Pose Variability in Walking Performances for Gait Analysis |
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| Year |
2008 |
Publication |
International Journal for Computational Vision and Biomechanics |
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1 |
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1 |
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33–43 |
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ISE |
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no |
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ISE @ ise @ RGM2008 |
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1020 |
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| Author |
Mikhail Mozerov; V. Kober |
| Title |
Impulse Noise Removal with Gradient Adaptive Neighborhoods |
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| Year |
2006 |
Publication |
Optical Engineering, 45: 67003 |
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ISE |
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no |
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ISE @ ise @ MoK2006 |
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676 |
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| Author |
Mikhail Mozerov; V. Kober; I.A. Ovseyevich |
| Title |
Robust Dynamic Programming Algorithm for Motion Detection and Estimation |
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2007 |
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ISE |
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no |
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ISE @ ise @ MKO2007 |
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810 |
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| Author |
Mikhail Mozerov; Ariel Amato; Xavier Roca; Jordi Gonzalez |
| Title |
Solving the Multi Object Occlusion Problem in a Multiple Camera Tracking System |
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Journal |
| Year |
2009 |
Publication |
Pattern Recognition and Image Analysis |
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19 |
Issue |
1 |
Pages |
165-171 |
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An efficient method to overcome adverse effects of occlusion upon object tracking is presented. The method is based on matching paths of objects in time and solves a complex occlusion-caused problem of merging separate segments of the same path. |
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1054-6618 |
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ISE |
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no |
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ISE @ ise @ MAR2009a |
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1160 |
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| Author |
Mikhail Mozerov; Ariel Amato; Xavier Roca; Jordi Gonzalez |
| Title |
Trajectory Occlusion Handling with Multiple View Distance Minimisation Clustering |
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2008 |
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Optical Engineering, vol. 47(04)04702, DOI:10.11781.2909665 |
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ISE |
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no |
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ISE @ ise @ MAR2008c |
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970 |
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| Author |
V. Kober; Mikhail Mozerov; Josue Albarez; I.A. Ovseyevich |
| Title |
Algorithms for Impulse Noise Renoval from Corrupted Color Images |
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2007 |
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ISE |
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no |
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ISE @ ise @ KMA2007 |
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811 |
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| Author |
V. Kober; Mikhail Mozerov; J. Alvarez-Borrego; I.A. Ovseyevich |
| Title |
Adaptive Correlation Filters for Pattern Recognition |
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Journal |
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2006 |
Publication |
Pattern Recognition and Image Analysis |
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16 |
Issue |
3 |
Pages |
425-431 |
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Pattern recognition, Correlation filters, A adaptive filters |
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Adaptive correlation filters based on synthetic discriminant functions (SDFs) for reliable pattern recognition are proposed. A given value of discrimination capability can be achieved by adapting a SDF filter to the input scene. This can be done by iterative training. Computer simulation results obtained with the proposed filters are compared with those of various correlation filters in terms of recognition performance. |
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ISE |
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no |
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ISE @ ise @ KMA2006a |
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673 |
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| Author |
Jordi Gonzalez; Javier Varona; Xavier Roca; Juan J. Villanueva |
| Title |
A Comparison Framework for Walking Performances using aSpaces |
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2005 |
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Electronic Letters on Computer Vision and Image Analysis, Special Issue on articulated Motion, 5(3):105–116 (Electronic Letters: IF: 1.016) |
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no |
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ISE @ ise @ GVR2005 |
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623 |
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| Author |
Carles Fernandez; Xavier Roca; Jordi Gonzalez |
| Title |
Providing Automatic Multilingual Text Generation to Artificial Cognitive Systems |
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2008 |
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ISE @ ise @ FRG2008 |
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1021 |
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| Author |
Carles Fernandez; Pau Baiget; Xavier Roca; Jordi Gonzalez |
| Title |
Interpretation of Complex Situations in a Semantic-based Surveillance Framework |
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2008 |
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Signal Processing: Image Communication, Special Issue on Semantic Analysis for Interactive Multimedia Services |
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23 |
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7 |
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554-569 |
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Cognitive vision system; Situation analysis; Applied ontologies |
| Abstract |
The integration of cognitive capabilities in computer vision systems requires both to enable high semantic expressiveness and to deal with high computational costs as large amounts of data are involved in the analysis. This contribution describes a cognitive vision system conceived to automatically provide high-level interpretations of complex real-time situations in outdoor and indoor scenarios, and to eventually maintain communication with casual end users in multiple languages. The main contributions are: (i) the design of an integrative multilevel architecture for cognitive surveillance purposes; (ii) the proposal of a coherent taxonomy of knowledge to guide the process of interpretation, which leads to the conception of a situation-based ontology; (iii) the use of situational analysis for content detection and a progressive interpretation of semantically rich scenes, by managing incomplete or uncertain knowledge, and (iv) the use of such an ontological background to enable multilingual capabilities and advanced end-user interfaces. Experimental results are provided to show the feasibility of the proposed approach. |
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no |
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ISE @ ise @ FBR2008 |
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954 |
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| Author |
Sergio Vera; Debora Gil; Antonio Lopez; Miguel Angel Gonzalez Ballester |
| Title |
Multilocal Creaseness Measure |
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Journal |
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2012 |
Publication |
The Insight Journal |
Abbreviated Journal |
IJ |
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Ridges, Valley, Creaseness, Structure Tensor, Skeleton, |
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This document describes the implementation using the Insight Toolkit of an algorithm for detecting creases (ridges and valleys) in N-dimensional images, based on the Local Structure Tensor of the image. In addition to the filter used to calculate the creaseness image, a filter for the computation of the structure tensor is also included in this submission. |
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Alma IT Systems |
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english |
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english |
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IAM;ADAS; |
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IAM @ iam @ VGL2012 |
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1840 |
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