Apparatus for detecting motion vector and encoding picture signals

摘要

Apparatus for detecting a motion vector and encoding picture signals. Where a motion vector is obtained by block matching employing a luminance pattern obtained by eliminating dc components from a luminance signal of a picture, and thus containing only ac components, is compared to a motion vector obtained by block matching employing a luminance signal of a picture. An optimum motion vector obtained based upon the result of comparison is employed as a true motion vector for variable length encoding the picture signal. In this manner, a correct motion vector may be detected and employed for variable length coding even in cases where the average luminance of the picture on the screen is varied significantly. $$