Patent ID: 7428343

Claim:
An apparatus to measure noise in video signals comprising: a high-frequency component determination part that detects a high-frequency component value of a first image to measure noise in a blockwise unit, the high-frequency component value indicating an amount of the high-frequency component in the first image; a spatial filter that filters the first image in the blockwise unit by applying different filtering methods according to the high frequency component value and outputs the filtered image as a second image; a motion compensation error determination part that determines a presence of a motion compensation error by comparing a first difference between corresponding pixel values of the first image and the second image with a second difference between corresponding pixel values of the first image and a third image which is motion-compensated from the first image; and a noise calculator that measures noise with reference to the second difference between the corresponding pixel values of the first image and the third image of pixels determined by the motion compensation error determination part to have no motion compensation error.