Patent ID: 7215377

Claim:
An image signal processing apparatus inputted with an image signal which is generated by performing double-speed conversion on an image subjected to telecine conversion and which is formed of unit-frames each including four fields of first and successive second to fourth fields, each of the unit-frame starting from the first field, 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 comes one frame behind the current field, with respect to the inputted image signal, and specifies each of the fields forming the unit-frame, based on the difference value; a motion vector detector which detects a motion vector for a field which comes two frames behind the current field, with respect to the detected pixel in the current field; and an image controller which shifts the positions of the detected pixels of the image signal within the fields specified by the sequence detector, respectively, in accordance with a vector quantity of the detected motion vector, wherein the image controller shifts the detected pixel, with respect to the specified first field, in a direction opposite to the motion vector, the image controller shifts the detected pixel, with respect to the specified fourth field, in a direction along the motion vector, and the image controller shifts the detected pixels, with respect to the specified second and third fields, so as to make the pixels gradually closer to the pixel position shifted with respect to the fourth field, in the consecutive order of the fields from the first field, in the direction along the motion vector or in the direction opposite to the motion vector.