Television – Special applications – Film – disc or card scanning
Patent
1994-07-05
1995-12-26
Kuntz, Curtis
Television
Special applications
Film, disc or card scanning
348 97, 348255, 348223, H04N 964
Patent
active
054792045
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
Fuji Photo Film Co. , Ltd.
Kuntz Curtis
Oh Minsun
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