| 摘要 |
In a digitally-assisted HD-MAC system, the digital assistance data relating to blocks of pixels is encoded by an encoding method which is of a type which produces a variable number of bits per frame. Preferred methods comprise simple, linear or complementary quadtree coding, or a Peano scan with run-length coding. A Huffman code may be employed. If the number of bits produced exceeds the system capacity, the coding method reverts to a fallback mode in which, for example, the areas closest to the centre of the picture receive the greatest coding detail. |
