Apparatus for decoding an object contour from a bitstream of contour information encoded using a chain code

摘要

A contour decoding apparatus decodes a bitstream of contour information which was encoded using a chain code. A demultiplexing unit separates the bitstream of the contour information into start contour pixel information and chain code information. A start contour pixel decoder 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 unit stores horizontal and vertical coordinate values of the previous contour pixel, selects an incremental/decremental value designated by the chain code information output from the demultiplexing unit, calculates coordinate values of the next contour pixel using the selected incremental/decremental value and the coordinate values decoded by the start contour pixel decoder 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/decremental value designated by the chain code information. A contour pixel representation unit displays a value representing a contour pixel at a pixel position designated by the coordinate values decoded by the start contour pixel decoder and the chain code decoding unit.