Grey value correction method for binary image data

Details Grey value correction method for binary image data Grey value correction method for binary image data

2011-04-26

2011-04-26

Bhatnagar, Anand (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S274000

Reexamination Certificate

active

07933466

ABSTRACT:
A method of gray value correction for binary image data, preferably screened image data, with a local gray value by a desired correction magnitude includes filtering the image data quantized with n bits with an asymmetrical low-pass filter whose filter window is smaller than a screen cell. By a threshold value operation, corrected binary image data is obtained from the filtered image data. Optimum threshold values are selected from a threshold value table as a function of the local gray value and of the desired correction magnitude.

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