Image processing apparatus

Details Image processing apparatus Image processing apparatus

1998-04-23

2000-04-25

Nguyen, Madeleine

Image analysis

Histogram processing

358521, G03F 308, G06K 900

Patent

active

060553316

ABSTRACT:
During pre-scanning, a CPU calculates a gradation data width corresponding to the number of pixels which are 0.3% of the total pixels from a minimum value in a frequency distribution curve of gradation data of all pixels; calculates effective minimum and maximum values from the minimum and maximum values of the gradation data of all pixels and the gradation data width. A gradation correction i performed in a gradation correcting device during main scanning using following equation:

REFERENCES:
patent: 4969053 (1990-11-01), Outa et al.
patent: 5321767 (1994-06-01), Murase
patent: 5748336 (1998-05-01), Kakutani
patent: 5841899 (1998-11-01), Ide et al.

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