Shading correction method and apparatus

Details Shading correction method and apparatus Shading correction method and apparatus

1993-12-28

1994-09-13

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358433, G06K 902

Patent

active

053473701

ABSTRACT:
Shading correction is effected by partitioning a white standard surface into a plurality of scanning blocks having the same number of scanning lines, scanning the standard surface by block to determine block median values in a first processing stage, determining global median values from the block median values in a second processing stage, and subjecting objective image data read from a given original image to arithmetic such as proportioning calculation. With the two-stage processing, shading distortion caused due to nonuniformity in sensitivity of an image scanning system can be rationally and reliably corrected to a high degree with a simple processing circuit.

REFERENCES:
patent: 4003021 (1977-01-01), Sasaki et al.
patent: 4523229 (1985-06-01), Kanmoto
patent: 4691365 (1987-01-01), Nagashima
patent: 4829379 (1989-05-01), Takaki
patent: 5260809 (1993-11-01), Tachikawa

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