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In this paper, the authors propose a novel method to measure the perceived picture quality of H.264 coded video based on hybrid no reference framework. The latter term means that the proposed model uses only receiver-side information for objective video quality assessment, but analyzes both the compressed bitstream and baseband signals of the decoded picture to improve the estimation accuracy of the...
The US military will use digital video compression for many different operations and applications. System requirements result in the need to transmit video streams within limited bandwidth, and often over harsh transmission environments. To deliver video with sufficient quality, the most modern video encoders and decoders (codecs) need to be employed with parameters optimized for high compression...
This paper proposes a fragile watermarking algorithm named compression watermarking algorithm (CWA) which provides compression and authentication functions to apply in MJPEG of video surveillance system. The watermark information is embedded into every 8 times 8 block in the coefficient domain in encoding process and extracted watermark from each 8 times 8 block in the coefficient domain in decoding...
This paper analyzes two variants of principal component analysis (PCA) for error-concealment: blockwise PCA and clustered blockwise PCA. Realistic communication channels are not error free. Since the signals transmitted on real-world channels are highly compressed, regardless of cause, the quality of images reconstructed from any corrupted data can be very unsatisfactory. Error concealment is intended...
Under the precondition of guaranteeing the compression ratio, in order to improve the quality of the reconstructed image, a fractal image compression method based on block classification and quadtree partition is proposed. Firstly, the image is partitioned through adaptive quadtree method. Then, the subblocks in each level are classified, according to the statistical characteristics of the subblocks...
Video data compression uses interframe coding to remove temporal redundancy and motion compensation plays a vital role in it. Generally, the block matching techniques are used for motion compensation and the matching criterions used are mean absolute difference (MAD) and mean square error (MSE). MSE has more computation than MAD and therefore, MAD is the most preferred block matching criterion for...
The H.264 encoder has input parameters that determine the bit rate and distortion of the compressed video and the encoding complexity. A set of encoder parameters is referred to as a parameter setting. We previously proposed two offline algorithms for choosing H.264 encoder parameter settings that have distortion-complexity performance close to the parameter settings obtained from an exhaustive search,...
A fast wavelet based low memory embedded block coding algorithm in image compression is presented in this paper. Several new technical measures are proposed to improve coding efficiency and reduce memory occupancy during the process of coding. The new technical measures include: first, code LLn sub-band separately; second, create block bit-length chart in terms of bit-length defined by the author;...
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