Gain-adaptive trained transform trellis code for images

Dong-Youn Kim; William A. Pearlman

doi:10.1117/12.24275

1 September 1990 Gain-adaptive trained transform trellis code for images

Dong-Youn Kim, William A. Pearlman

Proceedings Volume 1360, Visual Communications and Image Processing '90: Fifth in a Series; (1990) https://doi.org/10.1117/12.24275
Event: Visual Communications and Image Processing '90, 1990, Lausanne, Switzerland

Abstract

There exists a transform trellis code that is optimal for stationary Gaussian sources and the squared- error distortion measure at all rates. In this paper, we train an asymptotically optimal version of such a code to obtain one which is matched better to the statistics of real world data. The training algorithm uses the M-algorithm to search the trellis codebook and the LBG-algorithm to update the trellis codebook. To adapt the codebook for the varying input data, we use two gain-adaptive methods. The gain-adaptive sheme 1, which normalizes input block data by its gain factor, is applied to images at rate 0.5 bits/pixel. When each block is encoded at the same rate, the nonstationarity among the block variances leads to a variation in the resulting distortion from one block to another. To alleviate the non-uniformity among the encoded image, we design four clusters from the block power, in which each cluster has its own trellis codebook and different rates. The rate of each cluster is assigned through requiring a constant distortion per-letter. This gain-adaptive scheme 2 produces good visual and measurable quality at low rates.

Citation Download Citation

Dong-Youn Kim and William A. Pearlman "Gain-adaptive trained transform trellis code for images", Proc. SPIE 1360, Visual Communications and Image Processing '90: Fifth in a Series, (1 September 1990); https://doi.org/10.1117/12.24275

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