Image signal processing apparatus

Details Image signal processing apparatus Image signal processing apparatus

1984-10-11

1987-05-19

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 32, H04N 1387, H04N 5202

Patent

active

046672281

ABSTRACT:
An image signal processing apparatus has a color decorder for preparing a histogram for the brightness level of each color signal of an input image signal such as an NTSC signal, and an image process circuit for calculating a cumulative brightness distribution curve of the histogram and for performing gamma-correction of the input image signal in accordance with the cumulative brightness distribution curve. A CPU in the image process circuit can calculate upper and/or lower extremities of each cumulative distribution curve and perform normalization of each color signal within the range defined by the calculated upper and/or lower extremity.

REFERENCES:
patent: 4335399 (1982-06-01), Matsumoto
patent: 4371260 (1983-02-01), Yoshimoto et al.
patent: 4410909 (1983-10-01), Ueda et al.

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