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Author | Mikhail Mozerov; Joost Van de Weijer | ||||
Title | Global Color Sparseness and a Local Statistics Prior for Fast Bilateral Filtering | Type | Journal Article | ||
Year | 2015 | Publication ![]() |
IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 24 | Issue | 12 | Pages | 5842-5853 |
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Abstract | The property of smoothing while preserving edges makes the bilateral filter a very popular image processing tool. However, its non-linear nature results in a computationally costly operation. Various works propose fast approximations to the bilateral filter. However, the majority does not generalize to vector input as is the case with color images. We propose a fast approximation to the bilateral filter for color images. The filter is based on two ideas. First, the number of colors, which occur in a single natural image, is limited. We exploit this color sparseness to rewrite the initial non-linear bilateral filter as a number of linear filter operations. Second, we impose a statistical prior to the image values that are locally present within the filter window. We show that this statistical prior leads to a closed-form solution of the bilateral filter. Finally, we combine both ideas into a single fast and accurate bilateral filter for color images. Experimental results show that our bilateral filter based on the local prior yields an extremely fast bilateral filter approximation, but with limited accuracy, which has potential application in real-time video filtering. Our bilateral filter, which combines color sparseness and local statistics, yields a fast and accurate bilateral filter approximation and obtains the state-of-the-art results. | ||||
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ISSN | 1057-7149 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | LAMP; 600.079;ISE | Approved | no | ||
Call Number | Admin @ si @ MoW2015b | Serial | 2689 | ||
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Author | Mikhail Mozerov; Joost Van de Weijer | ||||
Title | Improved Recursive Geodesic Distance Computation for Edge Preserving Filter | Type | Journal Article | ||
Year | 2017 | Publication ![]() |
IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 26 | Issue | 8 | Pages | 3696 - 3706 |
Keywords | Geodesic distance filter; color image filtering; image enhancement | ||||
Abstract | All known recursive filters based on the geodesic distance affinity are realized by two 1D recursions applied in two orthogonal directions of the image plane. The 2D extension of the filter is not valid and has theoretically drawbacks, which lead to known artifacts. In this paper, a maximum influence propagation method is proposed to approximate the 2D extension for the
geodesic distance-based recursive filter. The method allows to partially overcome the drawbacks of the 1D recursion approach. We show that our improved recursion better approximates the true geodesic distance filter, and the application of this improved filter for image denoising outperforms the existing recursive implementation of the geodesic distance. As an application, we consider a geodesic distance-based filter for image denoising. Experimental evaluation of our denoising method demonstrates comparable and for several test images better results, than stateof-the-art approaches, while our algorithm is considerably fasterwith computational complexity O(8P). |
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Notes | LAMP; ISE; 600.120; 600.098; 600.119 | Approved | no | ||
Call Number | Admin @ si @ Moz2017 | Serial | 2921 | ||
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Author | Xinhang Song; Shuqiang Jiang; Luis Herranz | ||||
Title | Multi-Scale Multi-Feature Context Modeling for Scene Recognition in the Semantic Manifold | Type | Journal Article | ||
Year | 2017 | Publication ![]() |
IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 26 | Issue | 6 | Pages | 2721-2735 |
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Abstract | Before the big data era, scene recognition was often approached with two-step inference using localized intermediate representations (objects, topics, and so on). One of such approaches is the semantic manifold (SM), in which patches and images are modeled as points in a semantic probability simplex. Patch models are learned resorting to weak supervision via image labels, which leads to the problem of scene categories co-occurring in this semantic space. Fortunately, each category has its own co-occurrence patterns that are consistent across the images in that category. Thus, discovering and modeling these patterns are critical to improve the recognition performance in this representation. Since the emergence of large data sets, such as ImageNet and Places, these approaches have been relegated in favor of the much more powerful convolutional neural networks (CNNs), which can automatically learn multi-layered representations from the data. In this paper, we address many limitations of the original SM approach and related works. We propose discriminative patch representations using neural networks and further propose a hybrid architecture in which the semantic manifold is built on top of multiscale CNNs. Both representations can be computed significantly faster than the Gaussian mixture models of the original SM. To combine multiple scales, spatial relations, and multiple features, we formulate rich context models using Markov random fields. To solve the optimization problem, we analyze global and local approaches, where a top-down hierarchical algorithm has the best performance. Experimental results show that exploiting different types of contextual relations jointly consistently improves the recognition accuracy. | ||||
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Notes | LAMP; 600.120 | Approved | no | ||
Call Number | Admin @ si @ SJH2017a | Serial | 2963 | ||
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Author | Mikhail Mozerov; Joost Van de Weijer | ||||
Title | One-view occlusion detection for stereo matching with a fully connected CRF model | Type | Journal Article | ||
Year | 2019 | Publication ![]() |
IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 28 | Issue | 6 | Pages | 2936-2947 |
Keywords | Stereo matching; energy minimization; fully connected MRF model; geodesic distance filter | ||||
Abstract | In this paper, we extend the standard belief propagation (BP) sequential technique proposed in the tree-reweighted sequential method [15] to the fully connected CRF models with the geodesic distance affinity. The proposed method has been applied to the stereo matching problem. Also a new approach to the BP marginal solution is proposed that we call one-view occlusion detection (OVOD). In contrast to the standard winner takes all (WTA) estimation, the proposed OVOD solution allows to find occluded regions in the disparity map and simultaneously improve the matching result. As a result we can perform only
one energy minimization process and avoid the cost calculation for the second view and the left-right check procedure. We show that the OVOD approach considerably improves results for cost augmentation and energy minimization techniques in comparison with the standard one-view affinity space implementation. We apply our method to the Middlebury data set and reach state-ofthe-art especially for median, average and mean squared error metrics. |
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Notes | LAMP; 600.098; 600.109; 602.133; 600.120 | Approved | no | ||
Call Number | Admin @ si @ MoW2019 | Serial | 3221 | ||
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Author | Lichao Zhang; Abel Gonzalez-Garcia; Joost Van de Weijer; Martin Danelljan; Fahad Shahbaz Khan | ||||
Title | Synthetic Data Generation for End-to-End Thermal Infrared Tracking | Type | Journal Article | ||
Year | 2019 | Publication ![]() |
IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 28 | Issue | 4 | Pages | 1837 - 1850 |
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Abstract | The usage of both off-the-shelf and end-to-end trained deep networks have significantly improved the performance of visual tracking on RGB videos. However, the lack of large labeled datasets hampers the usage of convolutional neural networks for tracking in thermal infrared (TIR) images. Therefore, most state-of-the-art methods on tracking for TIR data are still based on handcrafted features. To address this problem, we propose to use image-to-image translation models. These models allow us to translate the abundantly available labeled RGB data to synthetic TIR data. We explore both the usage of paired and unpaired image translation models for this purpose. These methods provide us with a large labeled dataset of synthetic TIR sequences, on which we can train end-to-end optimal features for tracking. To the best of our knowledge, we are the first to train end-to-end features for TIR tracking. We perform extensive experiments on the VOT-TIR2017 dataset. We show that a network trained on a large dataset of synthetic TIR data obtains better performance than one trained on the available real TIR data. Combining both data sources leads to further improvement. In addition, when we combine the network with motion features, we outperform the state of the art with a relative gain of over 10%, clearly showing the efficiency of using synthetic data to train end-to-end TIR trackers. | ||||
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Notes | LAMP; 600.141; 600.120 | Approved | no | ||
Call Number | Admin @ si @ YGW2019 | Serial | 3228 | ||
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Author | Xinhang Song; Shuqiang Jiang; Luis Herranz; Chengpeng Chen | ||||
Title | Learning Effective RGB-D Representations for Scene Recognition | Type | Journal Article | ||
Year | 2019 | Publication ![]() |
IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 28 | Issue | 2 | Pages | 980-993 |
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Abstract | Deep convolutional networks can achieve impressive results on RGB scene recognition thanks to large data sets such as places. In contrast, RGB-D scene recognition is still underdeveloped in comparison, due to two limitations of RGB-D data we address in this paper. The first limitation is the lack of depth data for training deep learning models. Rather than fine tuning or transferring RGB-specific features, we address this limitation by proposing an architecture and a two-step training approach that directly learns effective depth-specific features using weak supervision via patches. The resulting RGB-D model also benefits from more complementary multimodal features. Another limitation is the short range of depth sensors (typically 0.5 m to 5.5 m), resulting in depth images not capturing distant objects in the scenes that RGB images can. We show that this limitation can be addressed by using RGB-D videos, where more comprehensive depth information is accumulated as the camera travels across the scenes. Focusing on this scenario, we introduce the ISIA RGB-D video data set to evaluate RGB-D scene recognition with videos. Our video recognition architecture combines convolutional and recurrent neural networks that are trained in three steps with increasingly complex data to learn effective features (i.e., patches, frames, and sequences). Our approach obtains the state-of-the-art performances on RGB-D image (NYUD2 and SUN RGB-D) and video (ISIA RGB-D) scene recognition. | ||||
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Notes | LAMP; 600.141; 600.120 | Approved | no | ||
Call Number | Admin @ si @ SJH2019 | Serial | 3247 | ||
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Author | Sudeep Katakol; Basem Elbarashy; Luis Herranz; Joost Van de Weijer; Antonio Lopez | ||||
Title | Distributed Learning and Inference with Compressed Images | Type | Journal Article | ||
Year | 2021 | Publication ![]() |
IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 30 | Issue | Pages | 3069 - 3083 | |
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Abstract | Modern computer vision requires processing large amounts of data, both while training the model and/or during inference, once the model is deployed. Scenarios where images are captured and processed in physically separated locations are increasingly common (e.g. autonomous vehicles, cloud computing). In addition, many devices suffer from limited resources to store or transmit data (e.g. storage space, channel capacity). In these scenarios, lossy image compression plays a crucial role to effectively increase the number of images collected under such constraints. However, lossy compression entails some undesired degradation of the data that may harm the performance of the downstream analysis task at hand, since important semantic information may be lost in the process. Moreover, we may only have compressed images at training time but are able to use original images at inference time, or vice versa, and in such a case, the downstream model suffers from covariate shift. In this paper, we analyze this phenomenon, with a special focus on vision-based perception for autonomous driving as a paradigmatic scenario. We see that loss of semantic information and covariate shift do indeed exist, resulting in a drop in performance that depends on the compression rate. In order to address the problem, we propose dataset restoration, based on image restoration with generative adversarial networks (GANs). Our method is agnostic to both the particular image compression method and the downstream task; and has the advantage of not adding additional cost to the deployed models, which is particularly important in resource-limited devices. The presented experiments focus on semantic segmentation as a challenging use case, cover a broad range of compression rates and diverse datasets, and show how our method is able to significantly alleviate the negative effects of compression on the downstream visual task. | ||||
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Notes | LAMP; ADAS; 600.120; 600.118 | Approved | no | ||
Call Number | Admin @ si @ KEH2021 | Serial | 3543 | ||
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Author | Yasuko Sugito; Javier Vazquez; Trevor Canham; Marcelo Bertalmio | ||||
Title | Image quality evaluation in professional HDR/WCG production questions the need for HDR metrics | Type | Journal Article | ||
Year | 2022 | Publication ![]() |
IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 31 | Issue | Pages | 5163 - 5177 | |
Keywords | Measurement; Image color analysis; Image coding; Production; Dynamic range; Brightness; Extraterrestrial measurements | ||||
Abstract | In the quality evaluation of high dynamic range and wide color gamut (HDR/WCG) images, a number of works have concluded that native HDR metrics, such as HDR visual difference predictor (HDR-VDP), HDR video quality metric (HDR-VQM), or convolutional neural network (CNN)-based visibility metrics for HDR content, provide the best results. These metrics consider only the luminance component, but several color difference metrics have been specifically developed for, and validated with, HDR/WCG images. In this paper, we perform subjective evaluation experiments in a professional HDR/WCG production setting, under a real use case scenario. The results are quite relevant in that they show, firstly, that the performance of HDR metrics is worse than that of a classic, simple standard dynamic range (SDR) metric applied directly to the HDR content; and secondly, that the chrominance metrics specifically developed for HDR/WCG imaging have poor correlation with observer scores and are also outperformed by an SDR metric. Based on these findings, we show how a very simple framework for creating color HDR metrics, that uses only luminance SDR metrics, transfer functions, and classic color spaces, is able to consistently outperform, by a considerable margin, state-of-the-art HDR metrics on a varied set of HDR content, for both perceptual quantization (PQ) and Hybrid Log-Gamma (HLG) encoding, luminance and chroma distortions, and on different color spaces of common use. | ||||
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Notes | 600.161; 611.007 | Approved | no | ||
Call Number | Admin @ si @ SVG2022 | Serial | 3683 | ||
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Author | Judit Martinez; F. Thomas | ||||
Title | Efficient Computation of Local Geometric Moments | Type | Journal Article | ||
Year | 2002 | Publication ![]() |
IEEE Transactions on Image Porcessing, (IF: 2.553) | Abbreviated Journal | |
Volume | 11 | Issue | 9 | Pages | 1102-1111 |
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Notes | Approved | no | |||
Call Number | Admin @ si @ MaT2002 | Serial | 271 | ||
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Author | Marc Bolaños; Mariella Dimiccoli; Petia Radeva | ||||
Title | Towards Storytelling from Visual Lifelogging: An Overview | Type | Journal Article | ||
Year | 2017 | Publication ![]() |
IEEE Transactions on Human-Machine Systems | Abbreviated Journal | THMS |
Volume | 47 | Issue | 1 | Pages | 77 - 90 |
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Abstract | Visual lifelogging consists of acquiring images that capture the daily experiences of the user by wearing a camera over a long period of time. The pictures taken offer considerable potential for knowledge mining concerning how people live their lives, hence, they open up new opportunities for many potential applications in fields including healthcare, security, leisure and
the quantified self. However, automatically building a story from a huge collection of unstructured egocentric data presents major challenges. This paper provides a thorough review of advances made so far in egocentric data analysis, and in view of the current state of the art, indicates new lines of research to move us towards storytelling from visual lifelogging. |
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Notes | MILAB; 601.235 | Approved | no | ||
Call Number | Admin @ si @ BDR2017 | Serial | 2712 | ||
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Author | J. Nuñez; O. Fors; Xavier Otazu; Vicenç Pala; Roman Arbiol; M.T. Merino | ||||
Title | A Wavelet-Based Method for the Determination of the Relative Resolution Between Remotely Sensed Images | Type | Journal | ||
Year | 2006 | Publication ![]() |
IEEE Transactions on Geoscience and Remote Sensing, 44(9): 2539–2548 | Abbreviated Journal | |
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Notes | CIC | Approved | no | ||
Call Number | CAT @ cat @ NFO2006 | Serial | 660 | ||
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Author | Anonymous | ||||
Title | A Low Computational-Cost Method to Fuse IKONOS Images Using the Spectral Response Function of Its Sensors | Type | Journal | ||
Year | 2006 | Publication ![]() |
IEEE Transactions on Geoscience and Remote Sensing, 44(6): 1683–1691 | Abbreviated Journal | |
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Notes | Approved | no | |||
Call Number | CAT @ cat @ GOF2006 | Serial | 650 | ||
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Author | Xavier Otazu; M. Gonzalez-Audicana; O. Fors; J. Nuñez | ||||
Title | Introduction of Sensor Spectral Response Into Image Fusion Methods. Application to Wavelet-Based Methods | Type | 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 | David Geronimo; Joan Serrat; Antonio Lopez; Ramon Baldrich | ||||
Title | Traffic sign recognition for computer vision project-based learning | Type | Journal Article | ||
Year | 2013 | Publication ![]() |
IEEE Transactions on Education | Abbreviated Journal | T-EDUC |
Volume | 56 | Issue | 3 | Pages | 364-371 |
Keywords | traffic signs | ||||
Abstract | This paper presents a graduate course project on computer vision. The aim of the project is to detect and recognize traffic signs in video sequences recorded by an on-board vehicle camera. This is a demanding problem, given that traffic sign recognition is one of the most challenging problems for driving assistance systems. Equally, it is motivating for the students given that it is a real-life problem. Furthermore, it gives them the opportunity to appreciate the difficulty of real-world vision problems and to assess the extent to which this problem can be solved by modern computer vision and pattern classification techniques taught in the classroom. The learning objectives of the course are introduced, as are the constraints imposed on its design, such as the diversity of students' background and the amount of time they and their instructors dedicate to the course. The paper also describes the course contents, schedule, and how the project-based learning approach is applied. The outcomes of the course are discussed, including both the students' marks and their personal feedback. | ||||
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Series Volume | Series Issue | Edition | |||
ISSN | 0018-9359 | ISBN | Medium | ||
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Notes | ADAS; CIC | Approved | no | ||
Call Number | Admin @ si @ GSL2013; ADAS @ adas @ | Serial | 2160 | ||
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Author | Zeynep Yucel; Albert Ali Salah; Çetin Meriçli; Tekin Meriçli; Roberto Valenti; Theo Gevers | ||||
Title | Joint Attention by Gaze Interpolation and Saliency | Type | Journal | ||
Year | 2013 | Publication ![]() |
IEEE Transactions on cybernetics | Abbreviated Journal | T-CIBER |
Volume | 43 | Issue | 3 | Pages | 829-842 |
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Abstract | Joint attention, which is the ability of coordination of a common point of reference with the communicating party, emerges as a key factor in various interaction scenarios. This paper presents an image-based method for establishing joint attention between an experimenter and a robot. The precise analysis of the experimenter's eye region requires stability and high-resolution image acquisition, which is not always available. We investigate regression-based interpolation of the gaze direction from the head pose of the experimenter, which is easier to track. Gaussian process regression and neural networks are contrasted to interpolate the gaze direction. Then, we combine gaze interpolation with image-based saliency to improve the target point estimates and test three different saliency schemes. We demonstrate the proposed method on a human-robot interaction scenario. Cross-subject evaluations, as well as experiments under adverse conditions (such as dimmed or artificial illumination or motion blur), show that our method generalizes well and achieves rapid gaze estimation for establishing joint attention. | ||||
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ISSN | 2168-2267 | ISBN | Medium | ||
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Notes | ALTRES;ISE | Approved | no | ||
Call Number | Admin @ si @ YSM2013 | Serial | 2363 | ||
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