Data filter and compression apparatus and method

Details Data filter and compression apparatus and method Data filter and compression apparatus and method

1982-09-30

1985-07-30

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358284, G06K 936

Patent

active

045326517

ABSTRACT:
A gray scale filter for image data is described which forces a least significant bit of a current pel equal to a most significant bit of the current pel when the most significant bit of the current pel is equal to the most significant bit of a previous and a next pel on a scan line of an image. The invention is embodied in a logic structure employing exclusive ORs to make comparisons between the previous, next and current pels and logic gates to gate the value of the most significant bit of the most current pel to an output representing a filtered least significant bit of the current pel. It should be noted that the value of the most significant bit of the current pel is not changed since only changes between gray-white and white or gray-black and black are filtered by the present invention.

REFERENCES:
patent: 4280144 (1981-07-01), Bacon
patent: 4301443 (1981-11-01), Sternberg et al.

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