Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1998-06-16
2000-01-11
Williams, Kimberly A.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358505, 358474, 358475, H04N 104, H04N 146, G03F 308
Patent
active
060142340
ABSTRACT:
An image reader has an image sensor for sensing an image, as a series of pixel signals, by exposing the sensor to light rays. The sensor exhibits a characteristic curve, having at least a partial linear section, describing a relationship between a level-value of a pixel signal and an exposure period over which the sensor is exposed to the light rays. First and second effective maximum level-values are determined from first and second series of pixel signals, obtained by exposing the sensor to the light rays, over first and second exposure periods, respectively. The second exposure period is longer than the first exposure period. The exposure periods are encompassed within the partial linear section of the characteristic curve, and an optimal exposure period of the image is determined based on the first and second effective maximum level-values corresponding to the first and second exposure periods, and an effective maximum level-value corresponding to the optimal exposure period.
REFERENCES:
patent: 4843474 (1989-06-01), Suzuki
patent: 4881127 (1989-11-01), Isoguchi et al.
patent: 4963985 (1990-10-01), Isoguchi et al.
patent: 5510623 (1996-04-01), Sayag et al.
patent: 5929908 (1999-07-01), Takahashi et al.
Browne, M.;Brown, A., "A smart high resolution scanning CCD camera", Engineering in Medicine and Biology Society, 1988., Proceeding of the Annual International Conference of the IEEE, pp. 384-385 vol. 1.
Asahi Kogaku Kogyo Kabushiki Kaisha
Williams Kimberly A.
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