Patent ID: 7817209

Claim:
A video signal processing device to remove a dot interference signal from a luminance signal obtained by separating a video signal having luminance and color signals multiplexed therein, comprising: a buffer section which delays an input luminance signal by a 1-frame period; a screen unit motion detection section which detects motion in an image indicated by the input luminance signal based on the input luminance signal and the luminance signal delayed by the 1-frame period, determines whether the image is a moving image or a static image by a screen unit, and outputs a gradual determination result from the static image to the moving image; a subtraction section which outputs a differential signal obtained by subtracting the input luminance signal from the luminance signal delayed by the 1-frame period; a pixel unit motion detection section which detects motion of a pixel unit in one screen based on the differential signal output from the subtraction section and a determination result of the screen unit motion detection section, and outputs a detection result by using a plurality of level values within a predetermined range; a limiting section which limits the differential signal output from the subtraction section in accordance with the determination result of the screen unit motion detection section; a multiplication section which multiplies an output signal of the limiting section by a detection result of the pixel unit motion detection section; and an adder which adds an output signal of the multiplication section and the input luminance signal together.