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检索条件"主题词=transform coding"

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Two-pass reconstruction in distributed video coding

Two-pass reconstruction in distributed video coding

引用

Picture coding Symposium, PCS

作者： Hongbin Liu Yongpeng Li Xianming Liu Siwei Ma Debin Zhao Wen Gao Department of Computer Science and Technology P.R. Harbin Institute of Technology Harbin China Chinese Academy of Sciences Beijing China Department of Computer Science and Technology Harbin Institute of Technology Harbin China Institute of Digital Media School of Electronic Engineering and Computer Science Peking University Beijing China

In this paper, we propose a novel two-pass reconstruction algorithm for the Wyner-Ziv (WZ) frames in distributed video coding (DVC), in which the traditional reconstructed WZ frame is utilized to perform motion estimation to obtain a more accurate motion field. During the motion estimation, the block, as well as its neighboring pixels are concerned. An overlapped block motion compensation is subsequently performed with the help of the motion field, consequently, an enhanced prediction for the WZ frame can be obtained, based on which an improved reconstruction can be achieved. Simulation results show that both the objective and subjective quality of WZ frames can be improved significantly.

关键词： Video coding Decoding Motion estimation Codecs Computer science Video compression Reconstruction algorithms Motion compensation Computational modeling transform coding

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A joint layered coding scheme for unified reliable and secure media transmission with implementation on JPEG 2000 images

A joint layered coding scheme for unified reliable and secur...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Xinglei Zhu Zhishou Zhang Chang Wen Chen Department of Computer Science and Engineering State University of New York Buffalo Buffalo NY USA Hewlett-Packard China Zhangjiang Hi-Tech Park Shanghai China

This paper presents a novel stream-level joint layered coding scheme for unified reliable and secure media transmission over wireless networks. The proposed scheme simultaneously protects both compressed media content and the authentication data from wireless channel impairments. Therefore, the media quality degradation incurred by both channel noise and authentication constraints can be minimized. With a prior knowledge of source coding and channel coding, the proposed joint system integrates authentication into the media error protection components to ensure 100% effective verification probability, i.e. every source decodable media unit is authenticable. In particular, by utilizing the contextual relationship, such as coding dependency and content importance between media slices for authentication hash appending, the proposed scheme generates an extremely low authentication overhead. The proposed authentication scheme is fundamentally different from many existing systems that consider the problem of authenticating media content separately from the other operations in the media transmission system. Under this joint layered coding framework, an optimal rate allocation algorithm for source coding, channel coding and media authentication is developed to guarantee the end-to-end media quality. Experiment results on JPEG 2000 images validate the proposed scheme and demonstrate that the performance of the proposed approach is approaching its upper bound, in which case no authentication is applied to the media stream.

关键词： Image coding Authentication Streaming media Protection Source coding Channel coding transform coding Wireless networks Communication system security Degradation

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Information Synthesis Algorithm Based on ROI coding Method of JPEG2000

Information Synthesis Algorithm Based on ROI Coding Method o...

引用

International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Xin-lin Huang Gang Wang Quan-rui Liao Chun-gang Liu Communication Research Center Harbin Institute of Technology Harbin China

In the date-link transmission systems, especially video-guided systems, information data and image data are transmitted among the communication units. A kind of synthesis algorithm is proposed based on region of interesting (ROI) coding method of JPEG2000. Since the algorithm is based on pixel data level, it is easy to realize for application. The simulation results show that reconstructed image quality decays ldB under low compression rate, while almost 0 dB under compression rate larger than 0.3 bpp.

关键词： Image coding transform coding Image quality Decoding Image reconstruction Streaming media TV Missiles Narrowband Layout

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Simple bit-plane coding for lossless image compression and extended functionalities

Simple bit-plane coding for lossless image compression and e...

引用

Picture coding Symposium, PCS

作者： Hisakazu Kikuchi Kunio Funahashi Shogo Muramatsu Department of Electrical and Electronic Engineering Niigata University Nishi Niigata Japan

A simple lossy-to-lossless bit-plane coding of still images is presented to integrate several functionality extension including selective tile partitioning, progressive transmission, ROI transmission, accuracy scalability, and others. The mean squared error between the original image and a decoded image at any progression level is known prior to encoding/decoding. The proposed bit-plane codec is competitive with JPEG-LS and JPEG 2000 in the lossless compression of 8-bit grayscale and 24-bit color images. The codec outperforms the existing standards in 8-bit color-quantized image compression.

关键词： Image coding Decoding Codecs Propagation losses Tiles Scalability transform coding Gray-scale Color Code standards

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Simple and efficient lossless coding for continuous tone color images

Simple and efficient lossless coding for continuous tone col...

引用

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Poonlap Lamsrichan Electrical Engineering Department Kasetsart University Bangkok Thailand

A simple lossless color image compression scheme is proposed. It utilizes integer color transform and integer wavelet transform to ensure complete reversibility with fixed-point implementation. In the encoding process, the wavelet coefficients are divided into smaller block in order to increase the performance of arithmetic coding which is applied to the actual values of transform coefficients. Without any prediction or other model in the process, this very simple coder has low complexity along with promising compression efficiency in continuous tone image. The comparison with lossless JPEG 2000 and JPEG-LS reveals that it has almost the same performance as the state-of-the-art standards. With its fast and low complexity algorithm, the proposed coder is suitable to be used within wireless sensor nodes in wireless sensor network.

关键词： Image coding Color Continuous wavelet transforms Wavelet transforms Wireless sensor networks Wavelet coefficients Arithmetic Predictive models transform coding Performance loss

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Panorama video coding for user-driven interactive video application

Panorama video coding for user-driven interactive video appl...

引用

IEEE International Symposium on Consumer Electronics (ISCE)

作者： Hideaki Kimata Shinya Shimizu Yutaka Kunita Megumi Isogai Yoshimitsu Ohtani NTT Cyber Space Laboratories NTT Corporation Yokosuka Japan

Panoramic video is efficient for user-driven interactive video application, so as the user can change his/her view angle. To achieve such interactivity, the efficient video coding method which supports high compression efficiency as well as key feature, such as spatially partial area decoding and smooth change of its position is proposed. In the proposed method, MVC video coding standard is used for compression, and the efficient control method of decoding and rendering of panoramic video is exploited.

关键词： Video coding Decoding Streaming media Video compression Navigation Rendering (computer graphics) Tiles Displays Image coding transform coding

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Lossy coding of ordered dither images -- Comparison of dispersed dither and clusterd dither --

Lossy coding of ordered dither images -- Comparison of dispe...

引用

Picture coding Symposium, PCS

作者： Fumitaka Ono Makoto Kitamura Tokyo Polytechnic University Japan

The lossy compression performance of two different ordering schemes: dispersed dither type and clustered dither type, are studied and compared. For lossy coding of ordered dither images, two methods; multi-level lossy image coding (LML) with post-processing of ordered dithering and transmission of the number of black pixels in a block of bi-level pixels (BPN), with two kind of bit rates, corresponding to two block sizes (2 times 2 pixels and 4 times 4 pixels) are examined. Concerning dither types, not much difference was found in entropy and also in image quality for 4 times 4 lossy case, but Bayer dithering works slightly better than screen dithering for 2 times 2 cases. Concerning the comparison of LML and BPN, BPN shows subjectively better picture quality than LML in 2 times 2 cases and the PSNR of Inverse Halftone (IH) images of restored bi-level images to the IH images of lossless halftone images is found to well reflect the subjective impression.

关键词： Image coding Propagation losses Entropy Image quality Pixel Bit rate Image restoration transform coding Transmitters Size control

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A new image compression scheme using repeat reduction and arithmetic coding

A new image compression scheme using repeat reduction and ar...

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International Conference on Computer and Information Technology (ICCIT)

作者： Md. Rafiqul Islam Abdullah-Al Baki Md. Shahidul Haque Palash Computer Science and Engineering Discipline Khulna University Khulna Bangladesh Khulna University Khulna BD

Based on some simple arithmetic operation, an efficient lossless image compression technique is proposed. We use repeat reduction and arithmetic coding to improve the results of compression. We get better results than log-exp based compression and arithmetic modulo based compression. From the experimental results, it can be seen that the performance of proposed method is better for all standard images. The complexity of our proposed method with respect to compression ratio has also been analyzed. The proposed method is most applicable for those images where lossy compression is to be avoided.

关键词： Image coding transform coding Image reconstruction Digital arithmetic Pixel Discrete cosine transforms Multimedia databases Internet Image quality Redundancy

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JPEG2000 ROI coding method with perfect fine-grain accuracy and lossless recovery

JPEG2000 ROI coding method with perfect fine-grain accuracy ...

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Asilomar Conference on Signals, Systems & Computers

作者： Joan Bartrina-Rapesta Joan Serra-Sagristà Francesc Aulí-Llinàs Juan Muñoz Gómez Department of Information and Communications Engineering Universitat Autònoma de Barcelona Spain

ISBN: (纸本)9781424458257

Medical images have high spatial and high bit-depth resolution (12 bits per sample or more). These high resolutions allow computer-aided diagnosis, which are exploited by radiologists to identify relevant medical areas, known as Regions of Interest (ROI). In image compression, ROI coding allows to recover the ROI earlier than the rest of the image. In JPEG2000, ROI coding may be provided through two different mechanisms: either by modifying wavelet coefficients, or by rate-distortion optimization techniques. The former obtains an excellent accuracy to delimit ROIs, but, in some cases, the ROI and the background can not be encoded losslessly; the latter is usually not able to achieve the intended fine-grain accuracy, but it overcomes the lossless encoding shortcoming. This article introduces a ROI coding method based on rate-distortion optimization techniques that recovers the ROI and the background losslessly, regardless of the high bit-depth resolution, and that yields an accuracy equivalent to MaxShift and Scaling, the two compliant JPEG2000 ROI coding methods based on modifying wavelet coefficients. The proposed method is JPEG2000 compliant.

关键词： Image coding transform coding Biomedical imaging Medical diagnostic imaging Spatial resolution Wavelet coefficients Rate-distortion Image resolution Computer aided diagnosis Optimization methods

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Improved quality multiple description 3D mesh coding with optimal filtering

Improved quality multiple description 3D mesh coding with op...

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IEEE International Conference on Image Processing

作者： Begüm Demir Sarp Ertürk Oğuzhan Urhan Electronic and Telecommunication Engineering Department Laboratory of Image and Signal Processing (KULIS) Kocaeli Turkey

A wavelet subdivision surfaces based multiple description 3D model coding with optimal reconstruction filtering approach is proposed in this paper to transmit 3D models over mediums with possible packet loss with higher quality. The proposed method is based on the wavelet subdivision surfaces strategy for 3D model coding and introduces optimal reconstruction filtering. Initially, remeshing is performed for any 3D model to obtain a semi-regular mesh structure which includes an irregular base mesh and regular wavelet (detail) coefficients of finer levels. Next, multiple descriptions of detail coefficients are obtained using Multiple Description Scalar Quantization (MDSQ) to be encoded using SPIHT. In the proposed approach, reconstructed multiple descriptions are applied to optimal filters, that are obtained at the encoder so as to reduce the reconstruction error between the original model and encoded model. Each transmitted description therefore includes encoded 3D data as well as optimal reconstruction filter coefficients. Experimental results show that the optimal reconstruction filtering approach reduces the distortion of standard MDSQ based 3D model coding.

关键词： Image reconstruction Filtering Wavelet coefficients Geometry Image coding Surface waves Surface reconstruction Filters transform coding Animation

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