| 摘要 |
In this invention, a correlation data and interpolation data generation circuit generates a vertical correlation signal, a plurality of left-downwardly inclined direction correlation signals, and a plurality of right-downwardly inclined direction correlation signals. The vertical direction correlation signal is generated by deriving a difference between two pixels which lie on a vertical line passing the position (center) of a pixel to be interpolated. The left-downwardly inclined direction correlation signals are generated by deriving a difference between one pair of pixels among pixels present in four regions defined by the vertical line and a horizontal line crossing at the center, which pair of pixels are arranged symmetrically in relation to the center and which respectively lie in the upper right region and lower left region, and the right-downwardly inclined direction correlation signals generated by deriving a difference between one pair of pixels which pair of pixels are arranged symmetrically in relation to the center and which respectively lie in the upper left region and lower right region. A correlation detection section receives the vertical direction correlation information, the left-downwardly inclined direction correlation signals, and the right-downwardly inclined direction correlation signals, and detects the smallest one of the absolute values of those signals and outputs data indicating the direction of pixels providing the smallest absolute value as a correlation detecting signal.
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