3D wavelet based video codec with human perceptual model

Details 3D wavelet based video codec with human perceptual model 3D wavelet based video codec with human perceptual model

2006-02-28

2006-02-28

An, Shawn S. (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240210, C375S240030, C375S240260, C375S240240, C375S244000, C386S349000, C348S472000, C382S239000, C382S240000, C382S251000

Reexamination Certificate

active

07006568

ABSTRACT:
A video encoding/decoding system based on 3D wavelet decomposition and the human perceptual model is implemented. JND is applied in quantizer design to improve the subjective quality of compressed video. The 3D wavelet decomposition helps to remove spatial and temporal redundancy and provides scalability of video quality. In order to conceal the errors that may, occur under bad wireless channel conditions, a slicing method and a joint source channel coding scenario, that combines RCPC with CRC and utilizes the distortion information to allocate convolutional coding rates are proposed. A new subjective quality index based on JND is presented and used to evaluate the overall system performance at different signal to noise rations (SNR) and at different compression ratios. Due to the wide use of arithmetic coding (AC) in data compression, it is considered as a readily available unit in the video codec system for broadcasting. A new scheme for conditional access (CA) sub-system is designed based on the compression graphic property of arithmetic coding. Its performance is analyzed along with its application in a multi-resolution video compression system. This scheme simplifies the conditional access sub-system and provides satisfactory system reliability.

REFERENCES:
patent: 5241382 (1993-08-01), Paik et al.
patent: 5822493 (1998-10-01), Uehara et al.
patent: 6211919 (2001-04-01), Zink et al.

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