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Simplified data compressorImage 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.
Document ID
19780000023
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Rice, R. F.
Tyree, V. C.
Wu, C.
Date Acquired
August 9, 2013
Publication Date
June 1, 1978
Publication Information
Publication: NASA Tech Briefs
Volume: 3
Issue: 1
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
NPO-14041
Accession Number
78B10023
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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