Patent ID: 9225989
Filing Date: 2015-12-29
Classification: H04N

Abstract:
1. An image processor which is configured: to receive a signal, to compare an individual frame under process, included in the received 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 at least a portion of 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 one pixel -whose characteristic value has changed as compared with a corresponding pixel of a preceding processed frame by a predetermined threshold, to change in the frame under process the characteristic values of all other pixels than those of the changed movement blocks by setting the characteristic 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 in connection with movement blocks detected as changed and also the information on unchanged movement blocks.