| 摘要 |
<p>A method and apparatus are disclosed for coding of digital images for subsequent display in the form of overlaid image planes (F, B). The information stored for image features differs from one plane to another: for example only four different colours may be supported in one plane and sixteen in another. When coding, a determination is made as to whether it is possible to specify an image feature in the simpler (four colour) plane and, only if not, the feature is coded in the more detailed plane. Image features are broken down into blocks with the determination taking place on a block-by-block basis.</p> |
