IMPROVEMENT OF THE VIDEO COPY PROTECTION PROCEDURE TO INTRODUCE HORIZONTAL AND VERTICAL IMAGE DISTORTIONS.

摘要

IMPROVEMENTS RELATED TO A PROCESS AGAINST VIDEO COPYING THAT GENERATES A VIDEO SIGNAL OF AN ABNORMALLY LOW AMPLITUDE TO RECORD IN AN ILLEGAL COPY. IN AN ASPECT OF THE IMPROVEMENTS, IT IS INTRODUCED IN THE OVERRANGE PORTION OF THE TELEVISION IMAGE, JUST BEFORE THE HORIZONTAL OR VERTICAL SYNCHRONIZATION SIGNALS BUT IN ACTIVE VIDEO, A WAY OF VARIATION IN A NEGATIVE SENSE THAT IS FOR THE TELEVISION RECEIVER OR FOR THE VIDEO TAPE RECORDER, IT IS PRESENTED AS A SYNCHRONIZATION SIGNAL, WHICH CAUSES A PREMATURE HORIZONTAL OR VERTICAL RETURN. AN ASPECT GENERATES (IN THE OVERWEIGHT PORTION OF THE RIGHT OF THE IMAGE) AN IMAGE IN CHESS BOARD WITH ALTERNATE GRAY AND BLACK AREAS WHICH MAKES THE TV DEPARTMENT IN WHICH THE ILLEGAL COPY IS RETURNING NORALLY HORIZONTALLY RETURNED SELECTED LINES WITH A HORIZONTAL DISPLACEMENT ACCORDING TO THE IMAGE INFORMATION THERE IS ON THESE LINES. THIS DEGRADES SUBSTANTIALLY THE IMAGE REPRESENTATION. IN ANOTHER ASPECT, A GRAY IMAGE IN THE LOWER OVERRANGE PORTION OF THE IMAGE CAUSES VERTICAL INSTABILITY OF THE IMAGE. IN ANOTHER ASPECT SELECTED HORIZONTAL SYNCHRONIZATION SIGNALS ARE CLOSED, WHICH CAUSES AN IRREGULAR VERTICAL RETURN. A DEVICE TO REMOVE OR DIMMISE THESE IMPROVEMENTS OF THE VIDEO SIGNAL IS ALSO PRESENTED TO ALLOW COPYING.