Image reading device with digitizing condition adjusting capabil

Details Image reading device with digitizing condition adjusting capabil Image reading device with digitizing condition adjusting capabil

1996-05-30

1999-06-01

Rogers, Scott

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

358445, 358461, 358475, H04N 140

Patent

active

059095172

ABSTRACT:
In an image reading device including an LED array, an image sensor, and an A/D converter, an initial digitizing condition is first set while determining whether or not the initial digitizing condition to be set meets a first criteria. Then, the initial digitizing condition is adjusted so as to meet the second a second criteria. An example of the digitizing condition is a high reference voltage applied to the A/D converter which converts an analog voltage ranging from a low reference voltage to the high reference voltage to a digital value. The second criteria is provided for, for example, reducing an S/N ratio when the image reading device reads half-tone images.

REFERENCES:
patent: 4516174 (1985-05-01), Kammoto
patent: 5111311 (1992-05-01), Yamamoto

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