Dynamic video scrambling

Details Dynamic video scrambling Dynamic video scrambling

H - Electricity

04

N

350/20

H04N 7/16 (2006.01) H04N 7/167 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1179765

DYNAMIC VIDEO SCRAMBLING ABSTRACT OF THE DISCLOSURE A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals includes means for comparing the bright- ness level during a predetermined time period of the video signal with the brightness level of the video signal over the succeeding predetermined time period. There are means for changing from one scrambling signal to another if the difference between brightness levels in successive predeter- mined time periods exceeds a given value.

414325

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