Perceptually tuned low-bit-rate video codec for ATM networks

Chun-Hsien Chou

doi:10.1117/12.233298

27 February 1996 Perceptually tuned low-bit-rate video codec for ATM networks

Chun-Hsien Chou

Proceedings Volume 2727, Visual Communications and Image Processing '96; (1996) https://doi.org/10.1117/12.233298
Event: Visual Communications and Image Processing '96, 1996, Orlando, FL, United States

Abstract

In order to maintain high visual quality in transmitting low bit-rate video signals over asynchronous transfer mode (ATM) networks, a layered coding scheme that incorporates the human visual system (HVS), motion compensation (MC), and conditional replenishment (CR) is presented in this paper. An empirical perceptual model is proposed to estimate the spatio- temporal just-noticeable distortion (STJND) profile for each frame, by which perceptually important (PI) prediction-error signals can be located. Because of the limited channel capacity of the base layer, only coded data of motion vectors, the PI signals within a small strip of the prediction-error image and, if there are remaining bits, the PI signals outside the strip are transmitted by the cells of the base-layer channel. The rest of the coded data are transmitted by the second-layer cells which may be lost due to channel error or network congestion. Simulation results show that visual quality of the reconstructed CIF sequence is acceptable when the capacity of the base-layer channel is allocated with 2 multiplied by 64 kbps and the cells of the second layer are all lost.

Citation Download Citation

Chun-Hsien Chou "Perceptually tuned low-bit-rate video codec for ATM networks", Proc. SPIE 2727, Visual Communications and Image Processing '96, (27 February 1996); https://doi.org/10.1117/12.233298

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KEYWORDS

Video

Distortion

Visualization

Asynchronous transfer mode

Photonic integrated circuits

Quantization

Video coding

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