Image processing apparatus capable of properly determining densi

Details Image processing apparatus capable of properly determining densi Image processing apparatus capable of properly determining densi

1995-11-21

1999-07-20

Boudreau, Leo H.

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

358466, 382270, G06K 938

Patent

active

059265795

ABSTRACT:
Density data produced by an image reading unit is input to a surface density detection unit, which detects a surface density by averaging density data of pixels within a predetermined density range. A period setting unit sets a period of sampling density data of pixels to be used for calculation of the surface density. A surface reference density generation unit generates a surface reference density by adding an offset to the detected surface density. A surface color elimination unit corrects density data of a pixel lower than the surface reference density to the white level to eliminate a surface color.

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