| 摘要 |
PURPOSE:To shorten the chromaticity calculation time of a color image by outputting a parallel image signal by delaying a serial image signal, and calculating chromaticity based on the signal. CONSTITUTION:A delay circuit D1 delays a (N-1)th video signal from a pre- amplifier 5 by a time T i.e. one horizontal scanning period 1H, and a delay circuit DN-2 delays a second video signal from the pre-amplifier 5 by a time (N-2T), and a delay circuit DN-1 delays a first video signal from the pre-amplifier 5 by a time (N-1T). A division circuit S1 calculates VN-1/VN, and a division circuit SN-2 calculates V2/VN, and a division circuit SN-1 calculates V1/VN. Where, (V1-VN-1) represent video signal levels in each color spectrum, and VN represents the video signal level in the reference spectrum of white light, etc. Therefore, first to (N-1)th video signals are outputted simultaneously from the delay circuits (D1-DN-1). In such a way, it is possible to shorten the calculation time of the chromaticity of the color image. |
