Adaptive, Hybrid, And Multi-Threshold CAQ Algorithms

J. J. Pearson; R. M. Simonds

doi:10.1117/12.954977

13 December 1976 Adaptive, Hybrid, And Multi-Threshold CAQ Algorithms

J. J. Pearson, R. M. Simonds

Proceedings Volume 0087, Advances in Image Transmission Techniques; (1976) https://doi.org/10.1117/12.954977
Event: 20th Annual Technical Symposium, 1976, San Diego, United States

Abstract

Three modifications of the Constant Area Quantization (CAQ) image bandwidth compression technique have been developed and tested in order to broaden the range of compression ratios obtainable with acceptable image quality. The first modification involved the introduction of an adaptive area threshold, the second was a two-threshold algorithm and the third was a hybrid of the CAQ with a Hadamard transform technique. Using these three algorithms together with the basic CAQ, images spanning the range from 0. 2 to 2 bits per picture element were obtained from an 8 bit original.

Citation Download Citation

J. J. Pearson and R. M. Simonds "Adaptive, Hybrid, And Multi-Threshold CAQ Algorithms", Proc. SPIE 0087, Advances in Image Transmission Techniques, (13 December 1976); https://doi.org/10.1117/12.954977

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