Search results for: M. Gabbouj
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The link between the Teager energy (TE) operator and the Wigner distribution (WD) is established in this paper. This link results in a simple way to calculate the second conditional moment in frequency of a Wigner distribution. Furthermore, this link helps explain the negative ‘energy’ via the Teager operator, and the negative conditional second moment via the Wigner distribution. We present the similarity...
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The combined use of bilinear and vector rational interpolation for motion field estimation of erroneously received MPEG-2 video bitstreams is reported. Motion vector rational interpolation is capable of adapting its behaviour with respect to neighbouring motion information. Bilinear interpolation, operating on a finer interpolation grid, takes neighbouring spatial correlations into account. Thus,...
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First version of the latest video coding standard, High Efficiency Video Coding (HEVC), only supports coding of video in YUV 4:2:0 chroma format. An extension of the standard that will support other chroma formats is currently under development, however, version 1 decoders will not be able to handle the bitstreams created using this extension. In this paper, we propose a novel method to create scalable...
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In multiview coding, motion information of different views forming the multiview video is correlated. The multiview extension of High Efficiency Video Coding (MV-HEVC) that is currently under development is defined to allow multi-view coding with minimal changes to HEVC. This is realized by simply adding the reconstructed base view picture to the reference picture list of the dependent views. MV-HEVC...
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This paper presents our system designed for MSR-Bing Image Retrieval Challenge @ ICME 2014. The core of our system is formed by a text processing module combined with a module performing PCA-assisted perceptron regression with random sub-space selection (P2R2S2). P2R2S2 uses Over-Feat features as a starting point and transforms them into more descriptive features via unsupervised training. The relevance...
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Automatic Control and Computer Sciences > 2014 > 48 > 6 > 345-357
Since video traffic is resource intensive, it is a challenging issue to stream video over low bandwidth networks, whereas video communication over LTE becomes an open research topic nowadays due to LTE’s high throughput capabilities. Indeed, video transmission requires low delay, and wireless channel is time-varying, which result in a scenario when a layer-separated design is replaced by a Cross-Layer...
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As a crucial security problem, anti-spoofing in biomet-rics, and particularly for the face modality, has achieved great progress in the recent years. Still, new threats arrive in form of better, more realistic and more sophisticated spoofing attacks. The objective of the 2nd Competition on Counter Measures to 2D Face Spoofing Attacks is to challenge researchers to create counter measures effectively...
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Automatic face recognition in unconstrained environments is a challenging task. To test current trends in face recognition algorithms, we organized an evaluation on face recognition in mobile environment. This paper presents the results of 8 different participants using two verification metrics. Most submitted algorithms rely on one or more of three types of features: local binary patterns, Gabor...
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High Efficiency Video Coding (HEVC) standard introduced an increased number of intra prediction directions in order to improve intra prediction performance by efficiently modeling the directional structures found in typical video contents. Efficient coding of intra prediction mode information is realized through a Most Probable Mode (MPM) list approach. In a scalable system, due to high correlation...
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The improved reversible data hiding scheme which is a part of JPEG coding process is introduced. Generally, one of the common constraints imposed on digital watermarking in frequency domain is a small payload that can be embedded without causing high degradation of a JPEG stego image. Moreover, even at small hidden payload the stego image file size will increase to some extent. In no existing data...
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2011 Joint Urban Remote Sensing Event > 245 - 248
In this paper, we propose the application of collective network of (evolutionary) binary classifiers (CNBC) to address the problems of feature/class scalability and classifier evolution, to achieve a high classification performance over full polarimetric SAR images even though the training (ground truth) data may not be entirely accurate. The CNBC basically adopts a “Divide and Conquer” type approach...
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In this paper, we propose an incremental evolution scheme within collective network of (evolutionary) binary classifiers (CNBC) framework to address the problem of incremental learning and to achieve a high retrieval performance for content-based image retrieval (CBIR). The proposed CNBC framework can still function even though the training (ground truth) data may not be entirely present from the...
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Local image features around interest-points have been widely used in order to exploit the similarities between different views of an object in different images. While there are numerous algorithms on detecting the interest-points and defining the local features, few have focused on the importance of the matching process. In this paper, we presented a method that matches interest-points detected via...
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IEEE Transactions on Broadcasting > 2011 > 57 > 2-1 > 231 - 245
Zapping-delay is an important factor contributing to the quality-of-experience (QoE) of any multimedia service; the longer the zapping-delay, the worse is the QoE. Therefore, for a good QoE, it is necessary to bind zapping-delay within acceptable bounds. Coded video uses a motion compensated prediction structure that contributes to the zapping-delay. In DVB-H, zapping-delay is further increased because...
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In this paper, we present a multi-form image representation and adaptive weighting approach for image browsing and retrieval systems. To support the development of the multi-form representation with understanding on users' image searching behavior, we conducted an interview study with users of various image browsing and retrieval systems. Based on the insights gained from the user study we propose...
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2010 IEEE International Conference on Image Processing > 2257 - 2260
In this paper, we focus on advanced classification and data retrieval schemes that are instrumental when processing large taxonomical image datasets. With large number of classes, classification and an efficient retrieval of a particular benthic macroinvertebrate image within a dataset will surely pose a severe problem. To address this, we propose a novel network of evolutionary binary classifiers,...
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2010 IEEE International Conference on Image Processing > 2929 - 2932
In packet-oriented networks, packet losses occur mainly due to queue overflows in congested network elements. An increase of the packet rate therefore raises the likelihood of congestion and expected number of lost packets. However, an increase of the packet size has typically a negligible impact on the packet loss rate or congestion in wired packet-switched networks. Scalable Video Coding (SVC),...
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Visual attention is an important attribute of the human visual system (HVS), while it has not been explored in image quality assessment adequately. This paper investigates the capabilities of visual attention models for image quality assessment in different scenarios: two-dimensional images, stereoscopic images, and Digital Cinema setup. Three bottom-up attention models are employed to detect attention...
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Directional Adaptive Interpolation Filtering (DAIF) is a novel interpolation technique that was proposed recently for hybrid video coding. It was reported, that this technique outperforms the standard H.264/AVC interpolation in terms of coding gain whereas requiring smaller number of arithmetic operations. In this publication we present an optimized implementation of DAIF on a modern computing platform...
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Recent advances in scalable video coding have paved the way for the development of flexible and adaptive media streaming applications. In order to support rate adaptation, 3GPP Packet-Switched Streaming Service (PSS) has specified a feedback mechanism that includes transmitting information about the status of the client buffer. This paper presents a novel Multiple Virtual Client Buffer Feedback (MVCBF)...
