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In multi-view video, illumination and color inconsistency among different views always exist because of imperfect camera calibration, CCD noise, camera positions and orientations, etc. Since illumination and color inconsistency greatly reduce the coding efficiency and rendering quality of multiview video, effective illumination and color correction modules are necessary for practical multi-view video...
Reverse playback is one of the most common video cassette recording (VCR) functions for video streaming systems. However, the predictive processing techniques employed in traditional hybrid video coding schemes severely complicate the reverse-play operation. In this paper, we enhance our previously proposed bidirectionally decodable Wyner-Ziv video coding scheme which supports both forward decoding...
Inter frame prediction technique significantly improves the compression efficiency in the hybrid video coding schemes. However, this technique causes the decoding dependency of each inter frame on all of its reference frames. This dependency complicates the reverse play operation which is the most common video cassette recording (VCR) functions. This dependency also causes error propagation when the...
In Wyner-Ziv video coding system, motion estimation efficiency is much lower than that in conventional video coding system because current frame is not available when doing motion estimation. In this paper, we propose a successive resolution refinement algorithm to improve motion estimation efficiency. Based on our rate distortion analysis, we derive optimal down-sample ratio for two-stage successive...
Due to the storage limit, the original raw video may not exist after compressing it into multiple video bitstreams using different compression parameters. In this paper, we suggest a least square error (LSE) algorithm to jointly decode the multiple video bitstreams, aiming to achieve better quality of the reconstructed video. The experimental results by joint decoding of multiple H.263 streams show...
In this paper, a maximum a posteriori based (MAP-based) video denoising algorithm is proposed. According to the Bayes rule, the MAP estimate is determined by two terms: noise conditional density model and priori conditional density model. Based on the assumptions that the noise satisfies Gaussian distribution and the priori model is measured by the bit rate, the MAP estimate can be expressed as a...
This paper addresses the security issues of the multimedia encryption schemes based on multiple Huffman table (MHT). A detailed analysis of known-plaintext attack is presented to show that the Huffman tables used for encryption should be carefully selected to avoid the weak keys problem. Further, we propose an efficient chosen-plaintext attack on the basic MHT method as well as the enhanced scheme...
In this paper, a novel spatial error concealment algorithm, which adaptively switches between directional interpolation and region matching, is proposed. Different from the previous spatial error concealment methods, which just utilize smooth property, the algorithm exploits both smooth property and texture information to recover the lost blocks. Based on the DCT coefficients in the available neighboring...
In this paper, a novel temporal error concealment algorithm, called spatio-temporal boundary matching algorithm (STBMA), is proposed to recover the information lost in the video transmission. Different from the classical boundary matching algorithm (BMA), which just considers the spatial smoothness property, the proposed algorithm introduces a new distortion function to exploit both the spatial and...
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