Patent ID: 7847831

Claim:
An image signal processing apparatus which corrects a distortion of an image in a picture in a moving picture including plural pictures that are sequentially inputted, said image signal processing apparatus comprising: a distortion detecting unit operable to detect the distortion of a line in a vertical direction in a distortion detecting picture in which the distortion is detected; and a correcting unit operable to correct an image in a picture to be corrected which is inputted subsequent to the distortion detecting picture, so as to eliminate a horizontal shift of the image corresponding to the distortion of the line in the vertical direction detected by said distortion detecting unit, wherein said distortion detecting unit includes a vertical correlation calculating unit operable to calculate, for plural amounts of shifts, correlations between values of pixels that are arranged on at least two horizontal rows of the distortion detecting picture, the pixels having an amount of the horizontal shift equal to each other and being in a relative positional relationship with each other, and wherein said correcting unit is operable to correct the image in the picture to be corrected so as to shift to an opposite direction by the amount of the horizontal shift at which a degree of correlation is at its peak, the degree of correlation being represented by the correlation calculated from said distortion detecting picture.