Method for processing image signals so as to color correct them

Details Method for processing image signals so as to color correct them Method for processing image signals so as to color correct them

1988-08-03

1990-04-24

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, G03F 308, H04N 146

Patent

active

049204114

ABSTRACT:
An image signal processing method for a picture output device converts three color separation signals of an original into digital signals, color corrects the digital signals and records a color image using the color corrected signals. According to one embodiment, the multiplied result of three color separation signals and corresponding predetermined coefficients are stored in a memory as a data table. The multiplied results are sequentially read out from the memory and added together. Color corrected signals are outputted in accordance with the added result for recording of the color images. Acording to another embodiment, the color distribution of the three color separation signals is discriminated to obtain a specific color distribution signal. The specific color distribution signal is then inputted as an address signal into a color conversion table via an address editing circuit. According to yet another embodiment, the number of output colors of the color image is set in advance. The number of quantization levels for digitizing the three color separation signals is then set in accordance with the set number of output colors.

REFERENCES:
patent: 4591904 (1986-05-01), Urabe et al.
patent: 4734763 (1988-03-01), Urabe et al.
patent: 4745466 (1988-05-01), Yoshida et al.
patent: 4845550 (1989-07-01), Urabe et al.

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