Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1993-05-10
1994-10-25
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348565, H04N 557
Patent
active
053593693
ABSTRACT:
A gradation correcting apparatus, which can be effectively incorporated into various video devices, enables the display of a sub-display within the domain of main-display (i.e. Picture in Picture) and also enables automatic adjustment of each gradation of the display dependent on the characteristics of the respective input signal. By using both a window pulse and a main- and sub-display switching signal, gradation corrections of the displays are carried out such that either no gradation correction is applied to the sub-display or a proper correction is applied according only to the sub-display signal. In this apparatus, the luminance information related to the sub-display and the luminance information related to the main-display excluding that of the sub-display are independently inputted into a signal correction system, thereby allowing individual processing of this information. Moreover, since the signal delay caused by the arithmetic processing can be precisely compensated for by a delay device, the gradation corrections for the main- and sub-displays are exactly executed according to the respective luminance level information, thus realizing an easy-to-see Picture in a Picture.
REFERENCES:
patent: 4367484 (1982-01-01), Kuroyanagi et al.
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patent: 4855825 (1989-08-01), Santamaki et al.
patent: 5239378 (1993-08-01), Tsuji et al.
patent: 5241386 (1993-08-01), Tsuji et al.
Izawa Yosuke
Okumura Naoji
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
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