Image signal processor and image signal processing method

Abstract

Provided is a video signal processing device in which a cross color generated by the leakage of a brightness signal component into a color picture signal component is reduced, and a resolution in an oblique direction is improved even when not only a narrow oblique line but brightness signals correlated with an oblique direction are continuously inputted, and to provide a method therefor. This device comprises: an oblique component detection circuit for detecting an oblique component from an inputted composite video signal; a delay circuit for delaying an output signal of a color separator circuit by a time period of a half cycle; an inverting circuit for alternately inverting with an output signal of a center point of the delay circuit as a reference; a minimum value circuit for comparing output signals different from each other out of the output signal of the delay circuit and that of the inverting circuit to select a minimum value; and a maximum value circuit for selecting a maximum value from output signals of the minimum value circuit. By switching a horizontal correlation detection range, the cross color is reduced and the resolution is improved.

Description

technical field [0001] The present invention relates to a device and method for separating luminance signal (Y) and / or chrominance signal (C) from full television signal. Background technique [0002] In recent years, with the increase in the size of television receivers and the development of high-quality images, more and more attention has been paid to the Y / C separation device (luminance signal / chrominance signal) that separates the luminance signal and chrominance signal Degree signal separation device) high performance. [0003] Next, a conventional Y / C separator will be described. [0004] Figure 11 It is a block diagram showing the structure of the Y / C separator disclosed in JP-A-5-111051. exist Figure 11 Among them, the input terminal 31 is an input part of a band-limited chrominance signal to be output from the interline comb filter. Delay circuits 32 to 35 are connected in series to the input terminal 31 . Delay circuits 32 to 35 delay the input signal by a h...

AI Technical Summary

Problems solved by technology

Therefore, it is possible to remove the signal in the case of inputting a minute slant of 1 wavelength or less (including 1 wavelength), but it cannot remove the signal when the slash is continuously input, and as a result, the color caused by cross-modulation distortion in the channel is suppressed. The effects of distortion and brightness cross color (cross·colour) are very small

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