| 摘要 |
In a method for encoding a contour of an object in a video signal based on a vertex information representing a position and an index of an octant corresponding to each vertex of the contour, a maximum length line segment (MLLS) is first detected among line segments for the contour based on the vertex information (VI). Then, an initial vertex position information (IVPI) and a final vertex position information (FVPI) for the contour are encoded, the initial vertex and the final vertex being two vertices constituting the MLLS. Thereafter, a first bit number (FBN) and a second bit number (SBN) for the contour are set, wherein the FBN is the number of bits required to encode the MLLS and the SBN is the number of bits calculated by using the FBN, typically being FBN-1. In a subsequent step, each of the vertices are classified based on the SBN and the VI either as a first vertex (FV) or as a second vertex (SV) to thereby provide first vertices (FV's) and second vertices (SV's). Then, an escape signal (ECS) for each SV is produced to supply a plurality of ECS's for the SV's. The numbers of the FV's (NFV) and the SV's (NSV) for the contour are calculated, respectively. Thereafter, each of the FV's and the SV's is encoded with either the FBN or the SBN based on the ECS's and the comparison result for the NFV and the NSV to thereby provide encoded FV's and encoded SV's. |
