Method of reducing digital images

Details Method of reducing digital images Method of reducing digital images

1989-05-01

1990-06-05

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358454, H04N 140

Patent

active

049318810

ABSTRACT:
An image binarization system in which the threshold value used for the binarization process can be adjusted to thereby enable the process to be made more accurate and avoid loss of black areas in characters in the process of digitizing and conversion. The threshold value is based on the average value of pixel density values around the pixels to be binarized, and is corrected downward when the average density value of the surrounding pixels is larger than a specific boundary value, and upward when the average value is smaller than the said boundary value.

REFERENCES:
patent: 4554593 (1985-11-01), Fox
patent: 4570186 (1986-02-01), Kurata
patent: 4656665 (1987-04-01), Pennebaker
patent: 4710822 (1987-12-01), Matsunawa
patent: 4742399 (1988-05-01), Kitamura
patent: 4751585 (1988-06-01), Shibazaki

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