Coding For Machine Readable-Human Readable Pictures

Robert A. Gonsalves; Alicia Shea

doi:10.1117/12.956664

7 December 1978 Coding For Machine Readable-Human Readable Pictures

Robert A. Gonsalves, Alicia Shea

Proceedings Volume 0149, Digital Image Processing II; (1978) https://doi.org/10.1117/12.956664
Event: 22nd Annual Technical Symposium, 1978, San Diego, United States

Abstract

If a picture is oversampled by a factor of N in both x and y directions, the resulting subarray for each original pixel contains up to N² log₂L bits of information, where L is the number of grey levels in each element of the subarray. The original pixel needs to be recorded at only about 8 bits for human viewing so the subarray can carry additional information. For example, a terrain map can be coded to include the x-y coordinates, the terrain height, and a geological descriptor. We describe a simple binary code (L=2) in which each 10 by 10 subarray (N=10) has its weight (the number of ones) constrained to yield 9 decimal descriptors. The code is self-synchronous so that no elaborate positioning techniques are required to read out the data.

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Robert A. Gonsalves and Alicia Shea "Coding For Machine Readable-Human Readable Pictures", Proc. SPIE 0149, Digital Image Processing II, (7 December 1978); https://doi.org/10.1117/12.956664

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KEYWORDS

Binary data

Digital image processing

Computer programming

Image retrieval

Analog electronics

Digital recording

Feature extraction

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