Image enhancing method using mean-matching histogram equalizatio

Details Image enhancing method using mean-matching histogram equalizatio Image enhancing method using mean-matching histogram equalizatio

1997-03-17

1999-01-19

Boudreau, Leo H.

Image analysis

Histogram processing

382274, G06K 900

Patent

active

058622543

ABSTRACT:
A histogram-equalization method and circuit for enhancing an image signal represented by a predetermined number of gray levels is presented. The method calculates a cumulative density function and a mean level in a unit of a picture, and maps an input sample into a new gray level according to a transform function which is defined by use of the cumulative density function and the mean level. The method may also include a step of obtaining a compensated mean level by adding to the mean brightness level, so that the input sample is mapped into the compensated mean level according to the mean level. Thus, a brightness compensation may be carried out along with the contrast enhancement of the image.

REFERENCES:
patent: 5341142 (1994-08-01), Reis et al.
patent: 5675624 (1997-10-01), Relihan et al.

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