发明名称 |
CIRCUIT FOR DETECTING CLEAR RED COLOR AND CIRCUIT FOR COLOR COMPENSATION EMPLOYING THE CIRCUIT FOR DETECTING THE CLEAR RED COLOR |
摘要 |
<p>Red color saturation is increased and red color with higher purity can be reproduced by composing: a red color detection circuit 1 for detecting a red color signal having higher purity by inputting color differential signals (R-Y) and (B-Y) modulated by color subcarrier, subtracting the absolute value of the (B-Y) signal from the positive polarity component of the (R-Y) signal and removing the negative part of the subtracted signal; Y signal compensation block including: first gain controller 50b for controlling the output signal amplitude of red color detection circuit 1 and a subtracter 50a for subtracting the output signal of first gain controller 50b from a luminance signal Y; an (R-Y) signal compensation block including: second gain controller 51b for controlling the output signal amplitude of red color detection circuit 1 and an adder 51a for adding the output signal of second gain controller 51b and the input (R-Y) signal; and a (B-Y) signal compensation block including: third gain controller 52b for controlling the output signal amplitude of red color detection circuit 1, a polarity inverter 52c for inverting the output signal polarity of third gain controller 52b, a switch circuit 52d for selecting either input signal or output signal of polarity inverter 52c, a polarity discriminater 52e for discriminating the polarity of the input (B-Y) signal and controlling switch circuit 52d and an adder 52e for adding the output signal of switch circuit 52d and the input (B-Y) signal.</p> |
申请公布号 |
CZ9803537(A3) |
申请公布日期 |
1999.03.17 |
申请号 |
CZ19980003537 |
申请日期 |
1998.03.05 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO. |
发明人 |
SUGIMOTO HIROKO;KAGEYAMA ATSUHISA;TAKESHIMA MASAHIRO;KAWABATA MINORU |
分类号 |
H04N9/64;G09G1/28;G09G5/02;H04N9/68;(IPC1-7):H04N9/64 |
主分类号 |
H04N9/64 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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