Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1998-04-02
2000-10-24
Peng, John K.
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
348577, 348576, 348575, 360 60, 380201, 380203, 705 57, H04N 7167
Patent
active
061379522
ABSTRACT:
Image-distorting artifacts are added to selected areas of a color image. A first artifact change is made to a luminance component of a selected area, and at least one other artifact change is made to chrominance components of the selected area. The artifact changes are perceptively balanced such that the artifacts are not perceptible when the image is displayed on a monitor. For example, changes in saturation are selected to balance changes in intensity of luminance. However, when the image is filtered such that one of the artifacts is modified, the remaining artifact becomes visible. Such filtering might be performed by an RGB-to-NTSC converter. Thus, if the RGB-to-NTSC converter is used between an RGB output of DVD-ROM electronics and a computer monitor (in an attempt to make an unauthorized copy), the video signal leaving the RGB-to-NTSC converter will contain perceptible artifacts and, therefore, images of reduced viewability. Consequently, attempts to make unauthorized copies of DVD discs onto NTSC-type videocassettes will be discouraged.
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Desir Jean W.
Hewlett--Packard Company
Peng John K.
LandOfFree
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