Patent ID: 7477803

Claim:
An image processing apparatus comprising: an input device adapted to input an image signal obtained with offset sampling per pixel; a correlation detecting device adapted to detect, based on the input image signal, degrees of correlation in horizontal and vertical directions for a target pixel to be interpolated, and to obtain correlation values representing the detected correlation degrees; a coefficient producing device adapted to produce a coefficient based on the correlation value in the horizontal direction and the correlation value in the vertical direction obtained by the correlation detecting device; an interpolation device adapted to produce an interpolation image signal in accordance with the coefficient produced by the coefficient producing device, and interpolate the image signal input from the input device by using the interpolation image signal, wherein the coefficient producing device produces the coefficient based on a differential between the correlation value in the horizontal direction and the correlation value in the vertical direction when both the correlation value in the horizontal direction and the correlation value in the vertical direction are smaller than a first threshold value, and produces the coefficient based on a ratio of the correlation value in the horizontal direction to the correlation value in the vertical direction when at least one of the correlation value in the horizontal direction and the correlation value in the vertical direction is not smaller than the first threshold value.