Image compression device

Details Image compression device Image compression device

1989-12-28

1991-09-03

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

3582611, 3582613, 341 87, 341 95, G06K 948, H04N 140

Patent

active

050461222

ABSTRACT:
This invention is an image compression device which includes a means to rearrange binary image data in a unit of pixel in accordance with a first conversion table, and a means to encode said rearranged data in accordance with a second conversion table, and which is characterized in that the second conversion table contains a data comprising a code which is added to a predetermined code used for the case where the same logical value continues in the rearranged data and which is based on the number of continuous pixels, a code having the same bit at the leading edge thereof as the leading bit of the predetermined code for the case where the same logical value continues up to the trailing end of the rearranged data, and a code having at its leading edge of a bit different from the leading bit of the predetermined code which is to be used for the data other than above. The above device according to this invention can compress any binary data including line images and dot images at high efficiency and high speed.

REFERENCES:
patent: 3624637 (1971-11-01), Irwin
patent: 3902008 (1975-08-01), Ogawa
patent: 4301479 (1981-11-01), Fukinuki et al.
patent: 4626829 (1986-12-01), Hauck
patent: 4757552 (1988-07-01), Asano et al.

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