| 摘要 |
PROBLEM TO BE SOLVED: To reduce the circuit scale and to obtain the same performance at a low cost by extracting a low frequency component of color difference signals through matrix calculation and low pass filters and using matrix calculation for the replacement between a high frequency component of a 1st luminance signal and a high frequency component of a 2nd luminance signal so as to allow the device to use only the two low pass filters. SOLUTION: RGB signals subject to white balance adjustment are given to an RGB→YC conversion circuit from input terminals 1-3. A luminance signal Y' without loopback is generated by a Y'-MAT circuit 4. Furthermore, color differences Pb, Pr are generated by a C-MAT circuit 5 and given to LPFs 6, 7, from which low frequency signals PbL, PL, are obtained. Through the matrix calculation by a Y-MAT circuit 8, a high frequency component of the luminance signal Y' without loopback is replaced with a high frequency component of the luminance signal without loopback according to the regular luminance formula and the luminance signal Y without loopback in the high frequency component is obtained.
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