This paper proposes a rate controlled redundancy-adaptive multiple description video coding method. The method adjusts the level of redundancy allocated to each macroblock based on an end to end distortion model that ...
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This paper proposes a rate controlled redundancy-adaptive multiple description video coding method. The method adjusts the level of redundancy allocated to each macroblock based on an end to end distortion model that takes into account the effects of error propagation and concealment. Rate control at the macroblock level ensures that the total bit rate of all descriptions does not exceed the target rate. Results show that the proposed MDC codec can adapt very well to changing transmission conditions. Gains of up to 14 dB at high packet error rates (low SNR) were recorded when coupled with a MIMO architecture, with no perceptible performance deficit at low packet error rates (high SNR). 2011 Elsevier B.V. All rights reserved.
This paper describes a videoconferencing system that meets performance constraints and functional requirements for use in consumer homes. Our system improves existing home technologies (such as video chat) by providin...
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This paper describes a videoconferencing system that meets performance constraints and functional requirements for use in consumer homes. Our system improves existing home technologies (such as video chat) by providing high-quality audiovisual communication, efficient encoding mechanisms, and low end-to-end delay. Moreover, the system includes a control interface that is capable of dynamically manipulating and compositing audiovisual content streams. This innovative architectural component is required for a domestic setting, where the television acts as the main screen and multiple people gather around it. Apart from the requirements and architecture, this paper analyses the performance of our system. The results validate our architectural decisions and provide a valuable input for further research in domestic videoconferencing.
The Conference on Human Vision and Electronic Imaging had its origins as three sessions in the 1988 SPIE/SPSE Symposium on Electronic Imaging Devices and Systems. These sessions brought together visual psychophysicist...
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ISBN:
(纸本)081942739X
The Conference on Human Vision and Electronic Imaging had its origins as three sessions in the 1988 SPIE/SPSE Symposium on Electronic Imaging Devices and Systems. These sessions brought together visual psychophysicists and imaging scientists and engineers to explore the relevance of human vision to the design of imaging systems. In the early years of the conference, the focus was on display technology and low-level image coding and rendering. The scope of the conference has grown with the evolution of electronic imaging technology, and the conference today includes papers on visualization, machine vision, digital image libraries, and art. Over the years, the conference has become more focused on truly integrating perception and engineering. We have been proud to see how our community has applied knowledge of perceptual systems to create novel engineering designs, and how knowledge of engineering challenges has led to the identification of novel directions for vision research. This paper will examine the progress of this multidisciplinary field as seen through the lens of this conference, and will speculate on where we are headed.
An improved compression method of color digital hologram by using wavelet transform is proposed, and the image without color aliasing and distortion can be reconstructed from compressed digital hologram. With the pres...
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An improved compression method of color digital hologram by using wavelet transform is proposed, and the image without color aliasing and distortion can be reconstructed from compressed digital hologram. With the presented method, wavelet decomposition, threshold, and quantization are used in the spectrum of hologram to reduce redundancy, then quantization and entropy coding are used in the spatial domain of hologram to remove coding redundancy further. Three different threshold methods for decomposition coefficients are used, and the high compression ratio as 83, 75 and 87 can be obtained respectively with the encoded color digital hologram. Meanwhile, the quality of the images reconstructed from digital hologram is minimally lost visually.
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