| 摘要 |
To discourage copying, compressibility-reducing artifacts are added to redundant areas of color images and video sequences. A first artifact change is made to a luminance component of a redundant area (124), and at least one other artifact change is made to chrominance components of the redundant area (126). The artifact changes are perceptively balanced such that the artifacts are not perceptible when the image is displayed on a monitor. However, the artifacts reduce redundancy in the image and, therefore, reduce compressibility of the image. In order to recompress a copied image, either the quality of the image must be reduced or the file size of the image must be increased. <IMAGE> |
