Apparatus and method for detecting motion vector in which degradation of image quality can be prevented

摘要

A motion detecting apparatus includes a comparator and motion estimator. The comparator compares a threshold and an input absolute error, and selects as a selected motion vector, one of a predetermined motion vector and an input motion vector based on the comparison result. The motion estimator determines a reference video signal based on the selected motion vector, and determines an absolute error from the determined reference video signal and an input video signal to output the determined absolute error. Then, the motion estimator estimates a motion vector from the determined reference video signal and the input video signal such that the absolute error is minimum, to output a motion vector determined based on the estimated motion vector and the selected motion vector.