Patent ID: 7221403

Claim:
An image signal processing apparatus comprising: a sequence detector which calculates a difference value in signal level between a detected pixel in a current field and a detected pixel at the same position in a field which is one frame behind the current field, with respect to a double-speed converted image signal in which every unit-frame starts with a first field, and specifies the first field, based on the difference value; a motion vector detector which detects a motion vector for a field which is one frame or two frames behind the current frame, with respect to the detected pixel in the current field; a pixel position operator which calculates a write pixel position to which a position of the detected pixel in the current field is shifted by a shift amount in a vector direction of the motion vector, in a write field subsequent to the first field, with the shift amount gradually increased within a range of a vector quantity of the motion vector as the write field follows the first field; a storage which stores the write pixel position calculated for every write field, so as to correspond to the motion vector; a pixel data operator which reads pixel data from each of first fields before and after the write field, in correspondence with the write pixel position and the motion vector stored in the storage in correspondence with the write pixel position, and calculates interpolation pixel data, based on the read pixel data; and an image controller which writes the interpolation pixel data calculated by the pixel data operator into the write pixel position, in the write field.