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Shiqi Yang; Yaxing Wang; Kai Wang; Shangling Jui; Joost Van de Weijer |
![download PDF file pdf](img/file_PDF.gif)
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Local Prediction Aggregation: A Frustratingly Easy Source-free Domain Adaptation Method |
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2022 |
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Arxiv |
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We propose a simple but effective source-free domain adaptation (SFDA) method. Treating SFDA as an unsupervised clustering problem and following the intuition that local neighbors in feature space should have more similar predictions than other features, we propose to optimize an objective of prediction consistency. This objective encourages local neighborhood features in feature space to have similar predictions while features farther away in feature space have dissimilar predictions, leading to efficient feature clustering and cluster assignment simultaneously. For efficient training, we seek to optimize an upper-bound of the objective resulting in two simple terms. Furthermore, we relate popular existing methods in domain adaptation, source-free domain adaptation and contrastive learning via the perspective of discriminability and diversity. The experimental results prove the superiority of our method, and our method can be adopted as a simple but strong baseline for future research in SFDA. Our method can be also adapted to source-free open-set and partial-set DA which further shows the generalization ability of our method. Code is available in this https URL. |
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LAMP; 600.147 |
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Admin @ si @ YWW2022b |
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3815 |
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Jaime Moreno; Xavier Otazu; Maria Vanrell |
![find book details (via ISBN) isbn](img/isbn.gif)
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Local Perceptual Weighting in JPEG2000 for Color Images |
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2010 |
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5th European Conference on Colour in Graphics, Imaging and Vision and 12th International Symposium on Multispectral Colour Science |
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255–260 |
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The aim of this work is to explain how to apply perceptual concepts to define a perceptual pre-quantizer and to improve JPEG2000 compressor. The approach consists in quantizing wavelet transform coefficients using some of the human visual system behavior properties. Noise is fatal to image compression performance, because it can be both annoying for the observer and consumes excessive bandwidth when the imagery is transmitted. Perceptual pre-quantization reduces unperceivable details and thus improve both visual impression and transmission properties. The comparison between JPEG2000 without and with perceptual pre-quantization shows that the latter is not favorable in PSNR, but the recovered image is more compressed at the same or even better visual quality measured with a weighted PSNR. Perceptual criteria were taken from the CIWaM (Chromatic Induction Wavelet Model). |
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Joensuu, Finland |
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9781617388897 |
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CGIV/MCS |
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CIC |
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CAT @ cat @ MOV2010a |
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1307 |
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Oriol Ramos Terrades; Ernest Valveny |
![find record details (via OpenURL) openurl](img/xref.gif)
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Local Norm Features based on ridgelets Transform |
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2005 |
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8th International Conference on Document Analysis and Recognition (ICDAR´05), 700–704 |
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DAG |
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DAG @ dag @ RaV2005d |
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642 |
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Jose Antonio Rodriguez; Florent Perronnin |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Local Gradient Histogram Features for Word Spotting in Unconstrained Handwritten Documents |
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2008 |
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Graphics Recognition: Recent Advances and New Opportunities |
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5046 |
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188–198 |
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W. Liu, J. Llados, J.M. Ogier |
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Admin @ si @ RoP2008a |
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992 |
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Jose Antonio Rodriguez; Florent Perronnin |
![find record details (via OpenURL) openurl](img/xref.gif)
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Local Gradient Histogram Features for Word Spotting in Unconstrained Handwritten Documents |
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2008 |
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International Conference on Frontiers in Handwriting Recognition |
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7–12 |
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Montreal (Canada) |
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ICFHR |
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no |
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Admin @ si @ RoP2008b |
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1066 |
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Author |
Cristhian Aguilera |
![find book details (via ISBN) isbn](img/isbn.gif)
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Local feature description in cross-spectral imagery |
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2017 |
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PhD Thesis, Universitat Autonoma de Barcelona-CVC |
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Over the last few years, the number of consumer computer vision applications has increased dramatically. Today, computer vision solutions can be found in video game consoles, smartphone applications, driving assistance – just to name a few. Ideally, we require the performance of those applications, particularly those that are safety critical to remain constant under any external environment factors, such as changes in illumination or weather conditions. However, this is not always possible or very difficult to obtain by only using visible imagery, due to the inherent limitations of the images from that spectral band. For that reason, the use of images from different or multiple spectral bands is becoming more appealing.
The aforementioned possible advantages of using images from multiples spectral bands on various vision applications make multi-spectral image processing a relevant topic for research and development. Like in visible image processing, multi-spectral image processing needs tools and algorithms to handle information from various spectral bands. Furthermore, traditional tools such as local feature detection, which is the basis of many vision tasks such as visual odometry, image registration, or structure from motion, must be adjusted or reformulated to operate under new conditions. Traditional feature detection, description, and matching methods tend to underperform in multi-spectral settings, in comparison to mono-spectral settings, due to the natural differences between each spectral band.
The work in this thesis is focused on the local feature description problem when cross-spectral images are considered. In this context, this dissertation has three main contributions. Firstly, the work starts by proposing the usage of a combination of frequency and spatial information, in a multi-scale scheme, as feature description. Evaluations of this proposal, based on classical hand-made feature descriptors, and comparisons with state of the art cross-spectral approaches help to find and understand limitations of such strategy. Secondly, different convolutional neural network (CNN) based architectures are evaluated when used to describe cross-spectral image patches. Results showed that CNN-based methods, designed to work with visible monocular images, could be successfully applied to the description of images from two different spectral bands, with just minor modifications. In this framework, a novel CNN-based network model, specifically intended to describe image patches from two different spectral bands, is proposed. This network, referred to as Q-Net, outperforms state of the art in the cross-spectral domain, including both previous hand-made solutions as well as L2 CNN-based architectures. The third contribution of this dissertation is in the cross-spectral feature description application domain. The multispectral odometry problem is tackled showing a real application of cross-spectral descriptors
In addition to the three main contributions mentioned above, in this dissertation, two different multi-spectral datasets are generated and shared with the community to be used as benchmarks for further studies. |
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October 2017 |
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Ph.D. thesis |
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Ediciones Graficas Rey |
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Angel Sappa |
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978-84-945373-6-3 |
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ADAS; 600.118 |
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no |
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Admin @ si @ Agu2017 |
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3020 |
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Author |
David Guillamet; Jordi Vitria |
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Local Discriminant Regions Using Support Vector Machines for Object Recognition. |
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Miscellaneous |
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2000 |
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Advances in Pattern Recognition, Lecture Notes in Computer Science 1876: 550–559, Springer Verlag. |
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OR;MV |
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BCNPCL @ bcnpcl @ GuV2000 a |
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240 |
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Author |
Sounak Dey; Anguelos Nicolaou; Josep Llados; Umapada Pal |
![download PDF file pdf](img/file_PDF.gif)
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Local Binary Pattern for Word Spotting in Handwritten Historical Document |
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Conference Article |
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2016 |
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Joint IAPR International Workshops on Statistical Techniques in Pattern Recognition (SPR) and Structural and Syntactic Pattern Recognition (SSPR) |
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574-583 |
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Local binary patterns; Spatial sampling; Learning-free; Word spotting; Handwritten; Historical document analysis; Large-scale data |
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Digital libraries store images which can be highly degraded and to index this kind of images we resort to word spotting as our information retrieval system. Information retrieval for handwritten document images is more challenging due to the difficulties in complex layout analysis, large variations of writing styles, and degradation or low quality of historical manuscripts. This paper presents a simple innovative learning-free method for word spotting from large scale historical documents combining Local Binary Pattern (LBP) and spatial sampling. This method offers three advantages: firstly, it operates in completely learning free paradigm which is very different from unsupervised learning methods, secondly, the computational time is significantly low because of the LBP features, which are very fast to compute, and thirdly, the method can be used in scenarios where annotations are not available. Finally, we compare the results of our proposed retrieval method with other methods in the literature and we obtain the best results in the learning free paradigm. |
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Merida; Mexico; December 2016 |
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S+SSPR |
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DAG; 600.097; 602.006; 603.053 |
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Admin @ si @ DNL2016 |
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2876 |
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B. Moghaddam; David Guillamet; Jordi Vitria |
![find record details (via OpenURL) openurl](img/xref.gif)
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Local Appearance-Based Models using High-Order Statistics of Image Features |
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2003 |
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Mitsubishi Electrical Reasearch Lab Technical Report |
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OR;MV |
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BCNPCL @ bcnpcl @ TR2003-85 |
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396 |
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Patricia Marquez; Debora Gil; R.Mester; Aura Hernandez-Sabate |
![download PDF file pdf](img/file_PDF.gif)
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Local Analysis of Confidence Measures for Optical Flow Quality Evaluation |
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2014 |
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9th International Conference on Computer Vision Theory and Applications |
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3 |
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450-457 |
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Optical Flow; Confidence Measure; Performance Evaluation. |
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Optical Flow (OF) techniques facing the complexity of real sequences have been developed in the last years. Even using the most appropriate technique for our specific problem, at some points the output flow might fail to achieve the minimum error required for the system. Confidence measures computed from either input data or OF output should discard those points where OF is not accurate enough for its further use. It follows that evaluating the capabilities of a confidence measure for bounding OF error is as important as the definition
itself. In this paper we analyze different confidence measures and point out their advantages and limitations for their use in real world settings. We also explore the agreement with current tools for their evaluation of confidence measures performance. |
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Lisboa; January 2014 |
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VISAPP |
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IAM; ADAS; 600.044; 600.060; 600.057; 601.145; 600.076; 600.075 |
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Admin @ si @ MGM2014 |
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2432 |
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J.M. Sanchez; X. Binefa; Jordi Vitria; Petia Radeva |
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Local Analysis for Scene Break Detection Applied to TV Commercials Recognition. |
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1999 |
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Visual information and information systems, 237–244, Springer– Verlag. |
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BCNPCL @ bcnpcl @ SBV1999 |
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Ozan Caglayan; Adrien Bardet; Fethi Bougares; Loic Barrault; Kai Wang; Marc Masana; Luis Herranz; Joost Van de Weijer |
![download PDF file pdf](img/file_PDF.gif)
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
LIUM-CVC Submissions for WMT18 Multimodal Translation Task |
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2018 |
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3rd Conference on Machine Translation |
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This paper describes the multimodal Neural Machine Translation systems developed by LIUM and CVC for WMT18 Shared Task on Multimodal Translation. This year we propose several modifications to our previou multimodal attention architecture in order to better integrate convolutional features and refine them using encoder-side information. Our final constrained submissions
ranked first for English→French and second for English→German language pairs among the constrained submissions according to the automatic evaluation metric METEOR. |
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Brussels; Belgium; October 2018 |
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WMT |
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LAMP; 600.106; 600.120 |
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Admin @ si @ CBB2018 |
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3240 |
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Ozan Caglayan; Walid Aransa; Adrien Bardet; Mercedes Garcia-Martinez; Fethi Bougares; Loic Barrault; Marc Masana; Luis Herranz; Joost Van de Weijer |
![download PDF file pdf](img/file_PDF.gif)
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Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
LIUM-CVC Submissions for WMT17 Multimodal Translation Task |
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2017 |
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2nd Conference on Machine Translation |
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This paper describes the monomodal and multimodal Neural Machine Translation systems developed by LIUM and CVC for WMT17 Shared Task on Multimodal Translation. We mainly explored two multimodal architectures where either global visual features or convolutional feature maps are integrated in order to benefit from visual context. Our final systems ranked first for both En-De and En-Fr language pairs according to the automatic evaluation metrics METEOR and BLEU. |
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WMT |
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LAMP; 600.106; 600.120 |
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Admin @ si @ CAB2017 |
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3035 |
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X. Binefa; J.M. Sanchez; Petia Radeva; Jordi Vitria |
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Linking Visual Cues and Semantic Terms Under Specific Digital Video Domains. |
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Miscellaneous |
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2000 |
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Journal of Visual Languages and Computing, 11(3):253–271. |
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OR;MILAB;MV |
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BCNPCL @ bcnpcl @ BRS2000 |
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337 |
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Armin Mehri; Parichehr Behjati Ardakani; Angel Sappa |
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LiNet: A Lightweight Network for Image Super Resolution |
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2021 |
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25th International Conference on Pattern Recognition |
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7196-7202 |
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This paper proposes a new lightweight network, LiNet, that enhancing technical efficiency in lightweight super resolution and operating approximately like very large and costly networks in terms of number of network parameters and operations. The proposed architecture allows the network to learn more abstract properties by avoiding low-level information via multiple links. LiNet introduces a Compact Dense Module, which contains set of inner and outer blocks, to efficiently extract meaningful information, to better leverage multi-level representations before upsampling stage, and to allow an efficient information and gradient flow within the network. Experiments on benchmark datasets show that the proposed LiNet achieves favorable performance against lightweight state-of-the-art methods. |
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Virtual; January 2021 |
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MSIAU; 600.130; 600.122 |
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Admin @ si @ MAS2021a |
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3583 |
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