Image processing method for color scanner

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Details

364518, 340706, 358 75, G06F 305

Patent

active

050620584

ABSTRACT:
An image processing method in a color scanner which includes an original base adapted to receive therein an original cassette that accomodate a color original, a light source for linearly radiating the original cassette as received in the original base, image sensors for color separating a transmitting or reflected light in a linear region of the color original into R, G and B for detection, a signal processing section for processing RGB image signals outputted from the image sensors by linearly scanning the color original to output four color image data such as C, M, Y and black, a color monitor connected to the signal processing section for displaying images of the four color image data, a data input device for inputting data required for the signal processing section and for designating a position where the color monitor displays and an output device for half-toning the four color image data to prepare a printing color separating block, which comprises the steps of: preparing a density cumulated histogram of the color original by using the RGB image signals, obtaining highlight point candidates and shadow point candidates of the color original due to the density cumulated histogram, displaying the highlight point candidates and the shadow point candidates on the image displayed on the color monitor, designating a highlight point and a shadow point by using the data input device, and setting condition data for the signal processing section in accordance with image data of the designated highlight point and shadow point.

REFERENCES:
patent: 4654720 (1987-03-01), Tozawa
patent: 4717967 (1988-01-01), Yoshida
patent: 4745576 (1988-05-01), Hasegawa et al.
patent: 4791589 (1988-12-01), Blazo et al.
patent: 4794382 (1988-12-01), Lai et al.
patent: 4879595 (1989-11-01), Niki et al.
patent: 4955680 (1990-09-01), Froese-Peeck et al.

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