H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/913 (2006.01) H04N 7/26 (2006.01) H04N 7/167 (2006.01) H04N 7/169 (2006.01)
Patent
CA 2252720
Scrambling and descrambling techniques are described which, unlike many typical scrambling systems, are compatible with all conceivable forms of signal compression systems. The scrambling technique is based on the principle of applying local spatial distortion to the pixels in a video image, and the like, to locally displace the pixels from their normal locations. Most compression systems rely on the condition that good correlation exists in the image and that any small portion, i.e., pixel, in an image is very similar to the portions, or pixels, nearby. Since the present technique provides local spatial distortion which does not de-correlate the image and does not re- arrange the pixels in the image, the pixels near other pixels prior to application of the scrambling technique, have the same positional relationship after scrambling. The complementary descrambling technique restores the locally displaced pixels to their normal locations to restore the video image to its original unscrambled state.
L'invention concerne des techniques d'embrouillage et de désembrouillage qui, à l'inverse de beaucoup de systèmes d'embrouillage classiques, sont compatibles avec toutes les formes possibles de compression des signaux. La technique d'embrouillage repose sur le principe d'une distorsion spatiale appliquée localement aux pixels d'une image video, et autres, l'objectif étant de déplacer les pixels par rapport à leur emplacement normal. La plupart des systèmes de compression reposent sur le principe selon lequel il existe une bonne corrélation dans l'image, moyennant quoi toute petite partie, c'est-à-dire tout pixel, d'une image ressemble beaucoup aux autres parties, ou pixels proches. Etant donné que la technique considérée consiste à appliquer localement la distorsion spatiale sans décorrélation de l'image et sans réaménagement des pixels dans l'image, les positions respectives des pixels avant l'application de la technique d'embrouillage restent les mêmes après embrouillage. La technique de désembrouillage complémentaire rétablit l'emplacement normal des pixels déplacés localement, en vue de rendre à l'image vidéo son état initial non embrouillé.
Deterrence Acquisition Limited
E. Guide Inc.
Gemstar Development Corporation
Index Systems Inc.
Interactive Sports Holdings Inc.
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