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Author Bojana Gajic; Eduard Vazquez; Ramon Baldrich edit  url
openurl 
  Title Evaluation of Deep Image Descriptors for Texture Retrieval Type (up) Conference Article
  Year 2017 Publication Proceedings of the 12th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP 2017) Abbreviated Journal  
  Volume Issue Pages 251-257  
  Keywords Texture Representation; Texture Retrieval; Convolutional Neural Networks; Psychophysical Evaluation  
  Abstract The increasing complexity learnt in the layers of a Convolutional Neural Network has proven to be of great help for the task of classification. The topic has received great attention in recently published literature.
Nonetheless, just a handful of works study low-level representations, commonly associated with lower layers. In this paper, we explore recent findings which conclude, counterintuitively, the last layer of the VGG convolutional network is the best to describe a low-level property such as texture. To shed some light on this issue, we are proposing a psychophysical experiment to evaluate the adequacy of different layers of the VGG network for texture retrieval. Results obtained suggest that, whereas the last convolutional layer is a good choice for a specific task of classification, it might not be the best choice as a texture descriptor, showing a very poor performance on texture retrieval. Intermediate layers show the best performance, showing a good combination of basic filters, as in the primary visual cortex, and also a degree of higher level information to describe more complex textures.
 
  Address Porto, Portugal; 27 February – 1 March 2017  
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  Language Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference VISIGRAPP  
  Notes CIC; 600.087 Approved no  
  Call Number Admin @ si @ Serial 3710  
Permanent link to this record
 

 
Author Marcos V Conde; Javier Vazquez; Michael S Brown; Radu TImofte edit   pdf
url  openurl
  Title NILUT: Conditional Neural Implicit 3D Lookup Tables for Image Enhancement Type (up) Conference Article
  Year 2024 Publication 38th AAAI Conference on Artificial Intelligence Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract 3D lookup tables (3D LUTs) are a key component for image enhancement. Modern image signal processors (ISPs) have dedicated support for these as part of the camera rendering pipeline. Cameras typically provide multiple options for picture styles, where each style is usually obtained by applying a unique handcrafted 3D LUT. Current approaches for learning and applying 3D LUTs are notably fast, yet not so memory-efficient, as storing multiple 3D LUTs is required. For this reason and other implementation limitations, their use on mobile devices is less popular. In this work, we propose a Neural Implicit LUT (NILUT), an implicitly defined continuous 3D color transformation parameterized by a neural network. We show that NILUTs are capable of accurately emulating real 3D LUTs. Moreover, a NILUT can be extended to incorporate multiple styles into a single network with the ability to blend styles implicitly. Our novel approach is memory-efficient, controllable and can complement previous methods, including learned ISPs.  
  Address  
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  Area Expedition Conference AAAI  
  Notes CIC; MACO Approved no  
  Call Number Admin @ si @ CVB2024 Serial 3872  
Permanent link to this record
 

 
Author Marcos V Conde; Florin Vasluianu; Javier Vazquez; Radu Timofte edit   pdf
url  openurl
  Title Perceptual image enhancement for smartphone real-time applications Type (up) Conference Article
  Year 2023 Publication Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision Abbreviated Journal  
  Volume Issue Pages 1848-1858  
  Keywords  
  Abstract Recent advances in camera designs and imaging pipelines allow us to capture high-quality images using smartphones. However, due to the small size and lens limitations of the smartphone cameras, we commonly find artifacts or degradation in the processed images. The most common unpleasant effects are noise artifacts, diffraction artifacts, blur, and HDR overexposure. Deep learning methods for image restoration can successfully remove these artifacts. However, most approaches are not suitable for real-time applications on mobile devices due to their heavy computation and memory requirements. In this paper, we propose LPIENet, a lightweight network for perceptual image enhancement, with the focus on deploying it on smartphones. Our experiments show that, with much fewer parameters and operations, our model can deal with the mentioned artifacts and achieve competitive performance compared with state-of-the-art methods on standard benchmarks. Moreover, to prove the efficiency and reliability of our approach, we deployed the model directly on commercial smartphones and evaluated its performance. Our model can process 2K resolution images under 1 second in mid-level commercial smartphones.  
  Address Waikoloa; Hawai; USA; January 2023  
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  ISSN ISBN Medium  
  Area Expedition Conference WACV  
  Notes MACO; CIC Approved no  
  Call Number Admin @ si @ CVV2023 Serial 3900  
Permanent link to this record
 

 
Author Danna Xue; Luis Herranz; Javier Vazquez; Yanning Zhang edit  url
doi  openurl
  Title Burst Perception-Distortion Tradeoff: Analysis and Evaluation Type (up) Conference Article
  Year 2023 Publication IEEE International Conference on Acoustics, Speech and Signal Processing Abbreviated Journal  
  Volume Issue Pages  
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  Abstract Burst image restoration attempts to effectively utilize the complementary cues appearing in sequential images to produce a high-quality image. Most current methods use all the available images to obtain the reconstructed image. However, using more images for burst restoration is not always the best option regarding reconstruction quality and efficiency, as the images acquired by handheld imaging devices suffer from degradation and misalignment caused by the camera noise and shake. In this paper, we extend the perception-distortion tradeoff theory by introducing multiple-frame information. We propose the area of the unattainable region as a new metric for perception-distortion tradeoff evaluation and comparison. Based on this metric, we analyse the performance of burst restoration from the perspective of the perception-distortion tradeoff under both aligned bursts and misaligned bursts situations. Our analysis reveals the importance of inter-frame alignment for burst restoration and shows that the optimal burst length for the restoration model depends both on the degree of degradation and misalignment.  
  Address Rodhes Islands; Greece; June 2023  
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  Area Expedition Conference ICASSP  
  Notes CIC; MACO Approved no  
  Call Number Admin @ si @ XHV2023 Serial 3909  
Permanent link to this record
 

 
Author Yawei Li; Yulun Zhang; Radu Timofte; Luc Van Gool; Zhijun Tu; Kunpeng Du; Hailing Wang; Hanting Chen; Wei Li; Xiaofei Wang; Jie Hu; Yunhe Wang; Xiangyu Kong; Jinlong Wu; Dafeng Zhang; Jianxing Zhang; Shuai Liu; Furui Bai; Chaoyu Feng; Hao Wang; Yuqian Zhang; Guangqi Shao; Xiaotao Wang; Lei Lei; Rongjian Xu; Zhilu Zhang; Yunjin Chen; Dongwei Ren; Wangmeng Zuo; Qi Wu; Mingyan Han; Shen Cheng; Haipeng Li; Ting Jiang; Chengzhi Jiang; Xinpeng Li; Jinting Luo; Wenjie Lin; Lei Yu; Haoqiang Fan; Shuaicheng Liu; Aditya Arora; Syed Waqas Zamir; Javier Vazquez; Konstantinos G. Derpanis; Michael S. Brown; Hao Li; Zhihao Zhao; Jinshan Pan; Jiangxin Dong; Jinhui Tang; Bo Yang; Jingxiang Chen; Chenghua Li; Xi Zhang; Zhao Zhang; Jiahuan Ren; Zhicheng Ji; Kang Miao; Suiyi Zhao; Huan Zheng; YanYan Wei; Kangliang Liu; Xiangcheng Du; Sijie Liu; Yingbin Zheng; Xingjiao Wu; Cheng Jin; Rajeev Irny; Sriharsha Koundinya; Vighnesh Kamath; Gaurav Khandelwal; Sunder Ali Khowaja; Jiseok Yoon; Ik Hyun Lee; Shijie Chen; Chengqiang Zhao; Huabin Yang; Zhongjian Zhang; Junjia Huang; Yanru Zhang edit  url
doi  openurl
  Title NTIRE 2023 challenge on image denoising: Methods and results Type (up) Conference Article
  Year 2023 Publication Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops Abbreviated Journal  
  Volume Issue Pages 1904-1920  
  Keywords  
  Abstract This paper reviews the NTIRE 2023 challenge on image denoising (σ = 50) with a focus on the proposed solutions and results. The aim is to obtain a network design capable to produce high-quality results with the best performance measured by PSNR for image denoising. Independent additive white Gaussian noise (AWGN) is assumed and the noise level is 50. The challenge had 225 registered participants, and 16 teams made valid submissions. They gauge the state-of-the-art for image denoising.  
  Address Vancouver; Canada; June 2023  
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  Area Expedition Conference CVPRW  
  Notes MACO; CIC Approved no  
  Call Number Admin @ si @ LZT2023 Serial 3910  
Permanent link to this record
 

 
Author Justine Giroux; Mohammad Reza Karimi Dastjerdi; Yannick Hold-Geoffroy; Javier Vazquez; Jean François Lalonde edit   pdf
url  openurl
  Title Towards a Perceptual Evaluation Framework for Lighting Estimation Type (up) Conference Article
  Year 2024 Publication Arxiv Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract rogress in lighting estimation is tracked by computing existing image quality assessment (IQA) metrics on images from standard datasets. While this may appear to be a reasonable approach, we demonstrate that doing so does not correlate to human preference when the estimated lighting is used to relight a virtual scene into a real photograph. To study this, we design a controlled psychophysical experiment where human observers must choose their preference amongst rendered scenes lit using a set of lighting estimation algorithms selected from the recent literature, and use it to analyse how these algorithms perform according to human perception. Then, we demonstrate that none of the most popular IQA metrics from the literature, taken individually, correctly represent human perception. Finally, we show that by learning a combination of existing IQA metrics, we can more accurately represent human preference. This provides a new perceptual framework to help evaluate future lighting estimation algorithms.  
  Address Seattle; USA; June 2024  
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  Area Expedition Conference CVPR  
  Notes MACO; CIC Approved no  
  Call Number Admin @ si @ GDH2024 Serial 3999  
Permanent link to this record
 

 
Author Xavier Otazu; M. Ribo; M. Peracaula; J.M. Paredes; J. Nuñez edit  openurl
  Title Detection of superimposed periodic signals using wavelets Type (up) Journal
  Year 2002 Publication Monthly Notices of the Royal Astronomical Society, 333, 2: 365–372 (IF: 4.671) Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ ORP2002 Serial 272  
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Author Xavier Otazu; M. Ribo; J.M. Paredes; M. Peracaula; J. Nuñez edit  openurl
  Title Multiresolution approach for period determination on unevenly sampled data Type (up) Journal
  Year 2004 Publication Monthly Notices of the Royal Astronomical Society, 351:251–219 (IF: 5.238) Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ ORP2004 Serial 451  
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Author Maria Vanrell; Ramon Baldrich; Anna Salvatella; Robert Benavente; Francesc Tous edit  openurl
  Title Induction operators for a computational colour-texture representation Type (up) Journal
  Year 2004 Publication Computer Vision and Image Understanding, 94(1–3):92–114, ISSN: 1077–3142 (IF: 0.651) Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ VBS2004 Serial 453  
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Author Robert Benavente; Maria Vanrell; Ramon Baldrich edit  openurl
  Title Estimation of Fuzzy Sets for Computational Colour Categorization Type (up) Journal
  Year 2004 Publication Color Research and Application, 29(5):342–353 (IF: 0.739) Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ BVB2004 Serial 484  
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Author M. Gonzalez-Audicana; Xavier Otazu; O. Fors; A. Seco edit  url
openurl 
  Title Comparison between Mallats and the trous discrete wavelet transform based algorithms for the fusion of multispectral and panchromatic images Type (up) Journal
  Year 2005 Publication International Journal of Remote Sensing, 26(3):595–614 (IF: 0.925) Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ GOF2005 Serial 530  
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Author Xavier Otazu; Maria Vanrell edit  openurl
  Title Perceptual representation of textured images Type (up) Journal
  Year 2005 Publication Journal of Imaging Science and Technology, 49(3):262–271 (IF: 0.522) Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ OtV2005b Serial 542  
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Author Maria Vanrell; Jordi Vitria edit  openurl
  Title Optimal 3x3 decomposable disks for morphological transformations Type (up) Journal
  Year 1997 Publication Image and Vision Computing, 15(2): 845–854 Abbreviated Journal  
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  Notes OR;CIC;MV Approved no  
  Call Number BCNPCL @ bcnpcl @ VaV1997c Serial 543  
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Author Xavier Otazu; M. Gonzalez-Audicana; O. Fors; J. Nuñez edit  openurl
  Title Introduction of Sensor Spectral Response Into Image Fusion Methods. Application to Wavelet-Based Methods Type (up) Journal
  Year 2005 Publication IEEE Transactions on Geoscience and Remote Sensing, 43(10): 2376–2385 (IF: 1.627) Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ OGF2005 Serial 564  
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Author A. Richichi; O. Fors; M.T. Merino; Xavier Otazu; J. Nuñez; A. Prades; U. Thiele; D. Perez-Ramirez; F.J. Montojo edit  openurl
  Title The Calar Alto lunar occultation program: update and new results Type (up) Journal
  Year 2006 Publication Astronomy and Astrophysics (Section ’Stellar structure and evolution’), 445:1081–1088 Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ RFM2006a Serial 589  
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Author Robert Benavente; Maria Vanrell; Ramon Baldrich edit  url
openurl 
  Title A data set for fuzzy colour naming Type (up) Journal
  Year 2006 Publication Color Research & Application, 31(1):48–56 Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ BVB2006 Serial 590  
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Author J. Nuñez; Xavier Otazu; M.T. Merino edit  openurl
  Title A Multiresolution-Based Method for the Determination of the Relative Resolution between Images. First Application to Remote Sensing and Medical Images Type (up) Journal
  Year 2005 Publication International Journal of Imaging Systems and Technology, 15(5): 225–235 (IF: 0.439) Abbreviated Journal  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ NOM2005 Serial 645  
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Author Xavier Otazu; Maria Vanrell edit  openurl
  Title Several lightness induction effects with a computational multiresolution wavelet framework Type (up) Journal
  Year 2006 Publication 29th European Conference on Visual Perception (ECVP’06), Perception Suppl s, 32: 56–56 Abbreviated Journal  
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  Address Saint-Petersburg (Russia)  
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  Notes CIC Approved no  
  Call Number CAT @ cat @ OtV2006 Serial 659  
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