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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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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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Rate distortion analysis of layered video coding by leaky prediction

Rate distortion analysis of layered video coding by leaky pr...

引用

Conference on visual communications and image processing 2004

作者： Liu, YX Salama, P Cook, GW Delp, EJ Purdue Univ Video & Image Proc Lab VIPER Sch Elect & Comp Engn W Lafayette IN 47907 USA

ISBN: (纸本)0819452114

Leaky prediction layered video coding (LPLC) partially includes the enhancement layer in the motion compensated prediction loop, by using a leaky factor between 0 and 1, to balance the coding efficiency and error resilience performance. In this paper., rate distortion functions are derived for LPLC from rate distortion theory. Closed form expressions are obtained for two scenarios of LPLC, one where the enhancement layer stays intact and the other where the enhancement layer suffers from data rate truncation. The rate distortion performance of LPLC is then evaluated with respect to different choices of the leaky factor, demonstrating that the theoretical analysis well conforms with the operational results.

关键词： rate distortion theory layered video coding leaky prediction error resilience

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Hybrid image coding for real-time computer screen video transmission

Hybrid image coding for real-time computer screen video tran...

引用

Conference on visual communications and image processing 2004

作者： Lin, T Hao, PW Xu, C Feng, JF Peking Univ Natl Lab Machine Percept Beijing 100871 Peoples R China

ISBN: (纸本)0819452114

In this paper, we present a novel hybrid image coding scheme for real-time applications of computer screen video transmission. Based on the Mixed Raster Content (MRC) multilayer imaging model, the background picture is compressed with lossy JPEG, and the foreground layer consisting of text and graphics is compressed with a block-based lossless coding algorithm, which integrates shape-based coding, palette-based coding, palette reuse, and LZW algorithm. The key technique is to extract text and graphics from background pictures accurately and with low complexity. Shape primitives, such as lines, rectangles, and isolated pixels with prominent colors, are found to be significant clues for textual and graphical contents. The shape-based coding in our lossless algorithm provides intelligence to extract the computer-generated text and graphics elegantly and easily. Experimental results demonstrate the efficiency and low complexity of our proposed hybrid image coding scheme.

关键词： hybrid image coding shape-based coding palette-based coding mixed raster content content adaptivity

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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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Coding-adaptive transforms

Coding-adaptive transforms

引用

Conference on visual communications and image processing 2004

作者： Lelescu, D Bossen, F DoCoMo Commun Labs USA San Jose CA USA

ISBN: (纸本)0819452114

Transform coding plays a central role in image and video coding technologies. Various transforms. whether fixed or adaptive, have been utilized for video compression. However, these transforms are inherently suboptimal in a coding-efficiency sense, given that their design does not explicitly take into account the entire transform coding model. Thus, commonly used transforms such as the DCT have desirable properties, but were designed without the full consideration of the other transform coding elements including quantization and entropy coding. Although these transforms have good performance in a rate-distortion sense, as demonstrated by today's image and video coding standards, we show that superior transforms can be designed based on the complete transform coding model. We present a new class of transforms called coding-adaptive transforms, that are derived under an optimality criterion which incorporates the elements of transform coding and is formulated for coding efficiency. Additionally characteristics of the new transforms such as adaptivity, generalization, and robustness are discussed.

关键词： Transform theory Video coding Video Quantization Computed tomography Computer programming image compression Algorithm development Motion models Performance modeling

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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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Optimization of the predict operator in lifting-based motion compensated temporal filtering

Optimization of the predict operator in lifting-based motion...

引用

Conference on visual communications and image processing 2004

作者： Pau, G Tillier, C Pesquet-Popescu, B ENST Signal & Image Proc Dept F-75634 Paris 13 France

ISBN: (纸本)0819452114

The motion-compensated temporal filtering is an essential part of a scalable wavelet-based video coding scheme, which applies a temporal wavelet transform in the motion direction over the frames of a video sequence. The lifting structure of the temporal filter bank tackled in this paper involves a predict operator which makes use of two motion vector fields to bidirectionally predict frames from their neighbouring ones. We show in this paper that there exists an optimal algorithm allowing to estimate jointly these two motion vector fields subject to an optimization criterion directly related to the coding of the detail subbands. We provide an iterative suboptimal form of this algorithm implementing this approach. We show that this algorithm provides substantial gains in terms of PSNR, with the same complexity as a separate estimation of the two motion vector fields.

关键词： wavelet video coding temporal lifting MCTF optimized prediction

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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...

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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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