NASA NTRS · 19780000023
Simplified data compressor
Abstract
Image data are compressed for transmission by simple, economical circuitry. Compressor handles data in blocks of 64 samples. Mean from previous line is subtracted, and pseudo-random sequence of positive and negative 1's multiplies samples of each block. Hadamard transform applied to blocks yields 64 transform coefficients. Each coefficient is compared with approximation to corresponding coefficient of previous line, and difference is quantized. Values are transmitted or stored. Procedure is reversed to reproduce image.
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Rice, R. F., Tyree, V. C., Wu, C.. 1978-06-01. Simplified data compressor. https://ntrs.nasa.gov/citations/19780000023
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