Data compression/decompression method, device and resulting data

Details Data compression/decompression method, device and resulting data Data compression/decompression method, device and resulting data

1991-07-12

1992-06-16

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

3582611, G06K 936, G06K 946, H04N 1419

Patent

active

051230615

ABSTRACT:
The invented data compression/decompression methods, device, and resulting data structures, operate by noting likenesses and differences between portions of data, and effecting data storage only with respect to the noted differences. The compression method arranges the data, compares portions of the data, and provides a flag to signal changes between adjacent data portions. The decompression method reads a portion of data, identifies whether the flag signals any changes in the data, and if so, reads a subsequent portion of data; but if no changes are signaled, then the first portion of data is duplicated. The invented device includes memory, a structure for storing data in the memory, data stored in the memory with flags to signal changes in the data, and structure for accessing and using the stored data. The invented data structure includes data divided into predetermined sections, and flags associated with the sections to signal changes within the sections.

REFERENCES:
patent: 3686631 (1972-08-01), Elliot
patent: 4307377 (1981-12-01), Pferd et al.
patent: 4568983 (1986-02-01), Bobick
patent: 4626829 (1986-12-01), Hauck
patent: 4727421 (1988-02-01), Koga
patent: 4876607 (1989-10-01), Tseng

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