Image reading apparatus, method and system

Details Image reading apparatus, method and system Image reading apparatus, method and system

1995-03-24

1998-02-10

Vu, Kim

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

358461, 358475, H04N 104

Patent

active

057177902

ABSTRACT:
This image reading apparatus includes: light sources, a line sensor for photoelectrically converting light from an original, a light source control section for controlling the lighting time of each light source; a gamma correction section for converting a photoelectrically converted electric signal to image data with a gamma function and a controller for controlling the light source control section and the gamma correction section. The controller adjusts the lighting time of the light source or the gradient of the gamma function in response to a specified lightness from an external computer so that image data in such specified lightness can be obtained. For example, in the case where the lightness is increased, if the user wishes a high quality image, the lighting time is increased, whereas if the user attaches importance to high speed reading, the gradient of the gamma function is increased. Further, in the case where the lightness is decreased, if the user wishes a high quality image, the gradient of the gamma function is decreased, whereas if the user attaches importance to high speed reading, the lighting time is shortened.

REFERENCES:
patent: 4791493 (1988-12-01), Ogura et al.
patent: 4888616 (1989-12-01), Nanamura et al.
patent: 5038225 (1991-08-01), Maeshima et al.
patent: 5212569 (1993-05-01), Takada et al.
patent: 5550651 (1996-08-01), Terajima

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