Television – Camera – system and detail – Combined image signal generator and general image signal...
Patent
1995-05-24
1996-04-30
Kuntz, Curtis
Television
Camera, system and detail
Combined image signal generator and general image signal...
348254, 348674, 348675, 348690, H04N 5202
Patent
active
055129480
ABSTRACT:
The white peak level and black peak level of each of three types of color signals R, G and B obtained by picking up a negative image are detected. The amplitudes and levels of the signals are adjusted in such a manner that the white peak levels of the color signals R, G and B coincide as well as the black peak levels of these color signals. Signals representing the detected white peak and black peak levels are superimposed in first-half and second-half portions of a blanking interval of each of the color signals R, G and B. The signals that result can be utilized in subsequent signal processing. Also, the input/output characteristics of a gamma correction circuit are represented by an exponential function, which is for a gamma correction, up to a fixed input range, and by a KNEE curve, whose slope is smaller than that of the exponential curve, in a range beyond the fixed input range. Variable-gain amplifier circuits are provided in the front and in the back of the gamma correction circuit, and the range of the input/output characteristic curve used in the gamma correction circuit is adjusted. As a result, video signals having a variety of tone characteristics may be processed and in addition, it is possible to realize a variable gamma for obtaining tone characteristics suited to personal preferences.
REFERENCES:
patent: 4608595 (1986-08-01), Nakayama
patent: 5157498 (1992-10-01), Suga
Fuji Photo Film Co. , Ltd.
Kuntz Curtis
Oh Minsun
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