| 摘要 |
A contour decoding apparatus decodes a bitstream of contour information encoded using a chain code. A demultiplexing unit (21) separates the bitstream of the contour information into start contour pixel information and chain code information. A start contour pixel decoder (22) decodes start contour pixel information separated by the demultiplexing unit and outputs horizontal and vertical coordinate values of the start pixel. A chain code decoding means (23-27, SW1-SW3) stores horizontal and vertical coordinate values of previous contour pixel, selects an incremental and decremental value designated by the chain code information output from the demultiplexing unit, calculates coordinate values of a next contour pixel using the selected incremental and decremental value and the coordinate values decoded by the start contour pixel decoder (22) or stored previous coordinates values decoded by the start contour pixel decoder (22) or stored previous coordinates values, and calculates coordinate values of the next contour pixel using the coordinate values of the previous contour pixel and the incremental and decremental value designated by the chain code information. A contour pixel representation unit (28) represents values representing a contour pixel on a pixel position designated by the coordinate values decoded by the start contour pixel decoder (22) and the chain code decoding unit (23-27, SW1-SW3). <IMAGE> |
