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检索条件"任意字段=Visual Communications and Image Processing 2004"

共 107 条记录，以下是31-40 订阅

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Y/C separation of composite color video signals using samples with non-opposite sub-carrier phases

Y/C separation of composite color video signals using sample...

引用

Conference on visual communications and image processing 2004

作者： Cordes, N de Haan, G Philips Res Labs Video Proc & Visual Percept Grp Eindhoven Netherlands

ISBN: (纸本)0819452114

For analog color television standards such as PAL and NTSC, the transmission of color (C) takes place within the band available for the luminance (Y). At the television receiver, the required separation of Y and C can only be imperfect as both components now share the same frequency space. Modern televisions apply so-called combfilters that exploit the opposite sub-carrier phase of correlated samples to separate both components. However, cross-talk artifacts and loss of resolution will occur in situations where no sufficiently correlated samples meet the strict opposite phase requirement. In this paper, a novel Y/C separation method is presented that is able to use samples with non-opposite sub-carrier phases.

关键词： luminance chrominance separation y/c separation comb filters composite video video signal processing

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image enhancement circuit using non-linear processing curve and constrained histogram range equalization

Image enhancement circuit using non-linear processing curve ...

引用

Conference on visual communications and image processing 2004

作者： Cvetkovic, SD de With, PHN Bosch Secur Syst NL-5616 LW Eindhoven Netherlands

ISBN: (纸本)0819452114

For real-time imaging in surveillance applications. image fidelity is of primary importance to ensure customer confidence. The obtained image fidelity is a result from amongst others dynamic range expansion and video signal enhancement. The dynamic range of the signal needs adaptation. because the sensor signal has a much larger range than the standard CRT display. The signal enhancement should accommodate for the widely varying light and scene conditions and user scenarios of the equipment. This paper proposes a new system to combine dynamic range and enhancement processing, offering a strongly improved picture quality for surveillance applications. The key to Our Solution is that we use Non-Linear processing (NLP) with a so-called Constrained Histogram Range Equalization (CHRE). The NLP transforms the digitized high-dynarnic lurninance sensor Signal such that details of' the low-luminance parts arc enhanced, while avoiding detail losses in the high-luminance areas. The CHRE technique enhances visibility of the global contrast for the camera signal Without significant information loss in the statistically less relevant areas. Evaluations of this proposal have shown clear improvements of the perceptual image quality. An additional advantage is that the new scheme is adaptable and allows the concatenation of further enhancement techniques without sacrificing the obtained picture quality improvement.

关键词： video signal enhancement dynamic range expansion contrast enhancement histogram equalization

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Progressive compression of PointTexture images

Progressive compression of PointTexture images

引用

Conference on visual communications and image processing 2004

作者： Song, IW Kim, CS Lee, SU Seoul Natl Univ Signal Proc Lab Sch Elect Engn & Comp Sci Seoul South Korea

ISBN: (纸本)0819452114

In this paper, we develop a tree-structured predictive partial matching (PPM) scheme for progressive compression of PointTexture images. By incorporating PPM with tree-structured coding, the proposed algorithm can compress 3D depth information progressively into a single bitstream. Also, the proposed algorithm compresses color information using a differential pulse coding modulation (DPCM) coder and interweaves the compressed depth and color information efficiently. Thus, the decoder can reconstruct 3D models from the coarsest resolution to the highest resolution from a single bitstream. Simulation results demonstrate that the proposed algorithm provides much better compression performance than a universal Lempel-Ziv coder, WinZip.

关键词： 3D compression progressive compression octree structure layered depth images Point-Texture depth image based rendering

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Universal motion prediction

Universal motion prediction

引用

Conference on visual communications and image processing 2004

作者： Li, Z Delp, EJ Purdue Univ Sch Elect & Comp Engn VIPER Video & Image Proc Lab W Lafayette IN 47907 USA

ISBN: (纸本)0819452114

This paper investigates the motion prediction techniques used in hybrid video coding. We first present a unified interpretation of motion prediction in terms of the prediction of motion threads. It is demonstrated that most current motion prediction techniques can be regarded as linear predictors of motion threads. Based on this new interpretation of motion prediction, we discuss the optimal motion predictor in the framework of Markov universal prediction. We define Markov predictability in a way that it upper bounds the optimal prediction performance in perfect reconstruction scenario. Since most current video applications use lossy coding, this results in imperfect reconstructions of the motion threads used in prediction. However, the optimality with the above perfect reconstruction scenario still holds in this case in an almost sure sense.

关键词： motion threading universal motion prediction optimal motion predictor Markov predictability

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Automated classification of female facial beauty by image analysis and supervised learning

Automated classification of female facial beauty by image an...

引用

Conference on visual communications and image processing 2004

作者： Gunes, H Piccardi, M Jan, T Univ Technol Sydney Comp Vis Res Grp Broadway NSW 2007 Australia

ISBN: (纸本)0819452114

The fact that perception of facial beauty may be a universal concept has long been debated amongst psychologists and anthropologists. In this paper, we performed experiments to evaluate the extent of beauty universality by asking a number of diverse human referees to grade a same collection of female facial images. Results obtained show that the different individuals gave similar votes, thus well supporting the concept of beauty universality. We then trained an automated classifier using the human votes as the ground truth and used it to classify an independent test set of facial images. The high accuracy achieved proves that this classifier can be used as a general, automated tool for objective classification of female facial beauty. Potential applications exist in the entertainment industry and plastic surgery.

关键词： facial beauty classification golden proportion facial features supervised learning performance evaluation

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Motion detection in color image sequence and shadow elimination

Motion detection in color image sequence and shadow eliminat...

引用

Conference on visual communications and image processing 2004

作者： Shen, J Univ Bordeaux 3 Inst EGID Bordeaux 3 F-33607 Pessac France

ISBN: (纸本)0819452114

Most of the researches are concentrated on motion detection in gray value image sequences and the methods for motion detection are based on background subtraction or on temporal gray value derivatives. The methods based on background subtraction, including auto-adaptive ones, meet difficulties in presence of illumination changes and of slowly moving objects and need to be re-initialized from time to time. The methods based on temporal derivatives are in general sensible to noise. Color images containing much richer information than the gray value ones, it would be interesting to use them to better detect moving objects. In this paper, we address the problem of motion detection in color image sequences and the problems of illumination changes and shadow elimination. Our motion detection method is based on fuzzy segmentation of the color difference image in help of non-symmetrical pi membership functions. The elimination of false moving objects detected due to illumination change is realized by combining the background subtraction method with the temporal derivative method and motion continuity. Shadows are removed by comparing the color of mobile pixels detected in the current frame with that in the precedent frame in HSL color space. Experimental results are reported.

关键词： color image sequence motion detection fuzzy deduction illumination change shadow elimination

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Motion blur reduction for liquid crystal displays: Motion compensated inverse filtering

Motion blur reduction for liquid crystal displays: Motion co...

引用

Conference on visual communications and image processing 2004

作者： Klompenhouwer, MA Velthoven, LJ Philips Res Labs NL-5656 AA Eindhoven Netherlands

ISBN: (纸本)0819452114

Flat panel displays, such as liquid crystal displays (LCDs), typically emit light during the whole frame time. In contrast, traditional cathode ray tubes (CRTs) emit light as very short pulses, which gives the CRT a better dynamic resolution. As a consequence, LCDs suffer from motion artifacts, which are visible as a blurring of moving objects. Based on a straightforward frequency domain analysis that takes into account the eye tracking of the viewer, we propose a method for reducing these artifacts. This method, 'motion compensated inverse filtering', uses motion vectors to apply a pre-correction to the video data. As such, we are able to recover the sharpness of moving images on LCDs to a large extent.

关键词： video processing liquid crystal displays LCDs motion blur inverse filtering

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Robust traffic event extraction from surveillance video

Robust traffic event extraction from surveillance video

引用

Conference on visual communications and image processing 2004

作者： Yoneyama, A Yeh, CH Kuo, CCJ Kokusai Denshin Denwa Co Ltd Res & Dev Labs Multimedia Commun Lab Kamifukuoka Saitama 3568502 Japan

ISBN: (纸本)0819452114

An approach to extract traffic events by integrating the low-level, middle-level, and high-level feature extraction modules is developed in this research. To be more specific, the low-level module extracts features such as motion, size, and location. The middle-level module builds a bridge between the road surface plane in the real world and the captured image plane by geometric analysis. Finally, the high-level module looks for traffic events such as "traffic jam", "lane change", and "traffic rule violation", which require the understanding of the video contents in a specific knowledge domain. In the high-level module, various traffic events are related to motion characteristics obtained from the middle-level module. It is demonstrated by experimental results that the proposed system can achieve robust traffic event extraction. The effectiveness of the proposed technique is analyzed. Conventional traffic event extraction methods demand the knowledge of capturing conditions for camera calibration. This requirement can be greatly relaxed in our proposed scheme.

关键词： traffic monitoring image analysis projection object tracking traffic events

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Human visual quality image/video compression techniques based on integer wavelet packet transform and SPIHT, and theirs application to mobile communications

Human visual quality image/video compression techniques base...

引用

Conference on visual Information processing XIII

作者： Asdornwised, W Jitapunkul, S Chulalongkorn Univ Dept Elect Engn Digital Signal Proc Res Lab Bangkok 10330 Thailand

ISBN: (纸本)0819453617

In this paper, we present an efficient compression technique that is suitable for image/video communications over wireless (mobile) channel. Our technique uses basic directional difference operators to estimate corresponding detail subband images/videos from their approximation subband images/videos. We empirically found that the detail subband images/videos can be well approximated by the estimate subband images/videos. In this work, image and video are first decomposed using integer wavelet packet transform. Having established that detail subband images/videos can be estimated from the approximation subbands, the information needed to send over the wireless channel is only the most important subband images/videos, where we selected them via best basis selection algorithm. Next, after best basis selection, the selected subband components are encoded using either SPIHT (JPEG) for image or 3-D SPIHT for video and then the encoded data are sent over the wireless channel. The advantages of our algorithms are two folds. First, most of the computation used in our technique is performed in integer for the purpose of coding speed improvement. Second, the computation of our algorithm either SPIHT (JPEG) or 3-D SPIHT is reduced from its original computation by an order of magnitude. The reason is that in our algorithm either SPIHT (JPEG) or 3-D SPIHT is performed only on the set of important components (two or a few subband images/videos) instead of the whole image/video. Finally, we show that our proposed algorithm using SPIHT (3-D SPIHT) are better than pure JPEG (MPEG-2) both in terms of human visual image quality and computation complexity.

关键词： image compression Wavelets visualization image analysis Mobile communications Video compression 3D image processing Wavelet transforms 3D video compression visual compression

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Distributed single source coding with side information

Distributed single source coding with side information

引用

Conference on visual communications and image processing 2004

作者： Vila-Forcen, JE Koval, O Voloshynovskiy, S Univ Geneva Dept Comp Sci CH-1211 Geneva Switzerland

ISBN: (纸本)0819452114

In the paper we advocate image compression technique in the scope of distributed source coding framework. The novelty of the proposed approach is twofold: classical image compression is considered from the positions of source coding with side information and, contrarily to the existing scenarios, where side information is given explicitly, side information is created based on deterministic approximation of local image features. We consider an image in the transform domain as a realization of a source with a bounded codebook of symbols where each symbol represents a particular edge shape. The codebook is image independent and plays the role of auxiliary source. Due to the partial availability of side information at both encoder and decoder we treat our problem as a modification of Berger-Flynn-Gray problem and investigate a possible gain over the solutions when side information is either unavailable or available only at decoder. Finally. we present a practical compression algorithm for passport photo images based on our concept that demonstrates the superior performance in very low bit rate regime.

关键词： image compression wavelets distributed source coding source coding with side information image enhancement rate-distortion function Markov chain random coding argument Slepian-Wolf coding Wyner-Ziv coding Berger-Flynn-Gray coding Estimation-Quantization

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