Patent ID: 8169547

Claim:
A video image processor which is configured to receive a video signal generated by a video camera, to compare an individual frame under process, included in the received video signal, with a preceding processed frame so as to detect changes; and to generate a signal which indicates changes, wherein the processor is configured: to detect changes by dividing the pixels of an individual frame into movement blocks of a predetermined size and to detect a given movement block as changed if in said movement block there are at least a given number of pixels whose colour value change as compared with those of a preceding processed frame exceeds a predetermined threshold, to change in the frame under process the colour values of all other pixels than those of the changed movement blocks by setting the colour values of pixels that are unchanged as compared with the preceding processed frame to predetermined values, and to generate said signal which indicates the changes by including in said signal the information on movement blocks detected as changed and also the information on unchanged movement blocks.