A New Flatbed Color Scanner With Automatic Operation

Makoto Hirosawa; Shinji Asada; Naokatsu Nishiguchi; Yoshihiro Kishida; Takashi Sakamoto; Noriyuki Shimano

doi:10.1117/12.963905

12 June 1990 A New Flatbed Color Scanner With Automatic Operation

Makoto Hirosawa, Shinji Asada, Naokatsu Nishiguchi, Yoshihiro Kishida, Takashi Sakamoto, Noriyuki Shimano

Proceedings Volume 1184, Neugebauer Memorial Seminar on Color Reproduction; (1990) https://doi.org/10.1117/12.963905
Event: Neugebauer Memorial SPIE Seminar on Color Reproduction, 1989, Tokyo, Japan

Abstract

Color-separated samples of several originals by expert scanner operators were collected and studies were niade into the relevance with the cumulative density histogram (CDH) of the original in order to automate the work of setting up the scanning conditions at a color scanner for prepress which is used for reproducing high-quality color originals. From the scanning results, it was discovered that the highlight and shadow densities to be setup were closely related to the densities in the proximity of the minimum density (Dmin) and maximum density (Dmax) of the CDH, respectively, and that the characteristics of tone reproduction are dependant on the density range of the original. An automatic setup model based on this knowledge was established and experiments have been carried out using a newly developed color flatbed scanner. The experimental results based on the proposed model were satisfactory. The color flatbed scanner houses newly developed CCD sensors and optical system, and high-speed, high-quality processing has been enabled by digital circuits. An easier-to-operate scanner has been achieved through an automatic setup function and easy handling of originals.

Citation Download Citation

Makoto Hirosawa, Shinji Asada, Naokatsu Nishiguchi, Yoshihiro Kishida, Takashi Sakamoto, and Noriyuki Shimano "A New Flatbed Color Scanner With Automatic Operation", Proc. SPIE 1184, Neugebauer Memorial Seminar on Color Reproduction, (12 June 1990); https://doi.org/10.1117/12.963905

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