Method of measuring shading characteristics in image information

Details Method of measuring shading characteristics in image information Method of measuring shading characteristics in image information

1988-10-13

1989-08-22

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358443, 358464, 358494, H04N 140

Patent

active

048601160

ABSTRACT:
Test image information is recorded on a test recording medium and the test recording medium is scanned with a light beam to produce an image signal in each of two modes in which the test recording medium is oriented such that a prescribed line on the test recording medium extends in a main scanning direction and an auxiliary scanning direction substantially normal to the main scanning direction respectively in the two modes. A signal level distribution A(x) is determined along the prescribed line of a signal indicative of a logarithmic function of an output signal from a light detector when the prescribed line extends along the main scanning direction, and a signal level distribution B(x) along the prescribed line of a signal indicative of a logarithmic function of an output signal from the light detector when the prescribed line extends along the auxiliary scanning direction (x indicates a pixel position on the prescribed line). Shading characteristics of an image information reading apparatus along the main scanning direction are determined based on the difference A(x)-B(x) between the signal level distributions A(x) and B(x).

REFERENCES:
patent: 4513325 (1985-04-01), Itoh
patent: 4661699 (1987-04-01), Welmers et al.
patent: 4751377 (1988-06-01), Ishizaka et al.

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