MOTION VECTOR DETECTION SYSTEM FOR TV SYSTEM CONVERSION SYSTEM

摘要

PURPOSE:To detect a motion vector faithful to movement by obtaining a required motion vector detected by a luminance signal when the picture gradient calculation result of the luminance signal exceeds a threshold value, and detected by a color difference signal when less than the threshold value. CONSTITUTION:A motion vector 23 detected by the luminance signal and an output 30 of a picture gradient calculation circuit 27 are inputted to a motion vector selection circuit 28. The abovementioned selection circuit 28 outputs the motion vector in the luminance signal as the required motion vector when the information indicates that the input 30 exceeds the threshold value. The circuit 28 outputs a motion vector 29 detected and selected by the color difference signal when less than the threshold value. This output 40 is simultaneously stored in a motion vector memory 13. Thus, the motion vectors of both the luminance signal and the color difference signal are detected respectively and selected by the result of the picture gradient calculation so that the motion vector extremely faithful to the movement of the picture.