Image quantization and coding based on adaptive threshold

Details Image quantization and coding based on adaptive threshold Image quantization and coding based on adaptive threshold

2007-02-06

2007-02-06

Dang, Duy M. (Department: 2624)

Image analysis

Image compression or coding

Adaptive coding

C382S232000, C382S240000

Reexamination Certificate

active

10077208

ABSTRACT:
A monitoring unit monitors continuously wavelet transform component output from a wavelet transformer. When a condition “make all the components of the HH sub-band0” is applied as a quantization strategy, the monitoring unit detects the maximum value N among the components in the HH sub-band and determines the threshold as N+1. The threshold is then sent to a quantizer.

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Przelaskowski, A., et al., “Effective Wavelet-Based Compression Method with Adaptive Quantization Threshold and Zerotree Coding,”Proceedings of the SPIE 3229:348-356, Nov. 3, 1997, Bellingham, Wash.

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