Patent ID: 7750945

Claim:
A video signal processing device, comprising: image data generating means for converting a video signal inputted from an imaging element into image data based on effective pixels contained in said video signal; image compression means for compressing said image data at a predetermined compression ratio; contour correction means for carrying out a contour correction on said image data compressed by said image compression means in accordance with a contour correction gain to output a corrected video signal; contour correction gain calculating means for calculating said contour correction gain based on said compression ratio at which said image compression means compresses said image data and frequency components of said compressed image data; and image frequency component detecting means for detecting said frequency components of said compressed said image, comprising: a low frequency brightness average calculating unit for calculating a low frequency brightness average of said compressed image data, a high frequency brightness average calculating unit for calculating a high frequency brightness average of said compressed image data, and a gain control signal generating unit for comparing said low frequency brightness average calculated by said low frequency brightness average calculating unit and said high frequency brightness average calculated by said high frequency brightness average calculating unit, generating a gain control signal used to decrease said contour correction gain when it is judged that said low frequency brightness average is greater than said high frequency brightness average but lower than a predetermined low frequency brightness reference value, generating a gain control signal used to increase said contour correction gain when it is judged that said high frequency brightness average is greater than both said low frequency brightness average and greater than a predetermined high frequency brightness reference value, and outputting said gain control signal to said contour correction gain calculating means.