A contour-based approach to binary shape coding using a multiple grid chain code

摘要: This paper presents a contour-based approach to efficiently code binary shape information in the context of object-based video coding. meets some most important requirements identified for MPEG-4 standard, notably efficient coding and low delay. The proposed methods support both lossless quasi-lossless modes. For cases where delay is primary requirement, macroblock-based mode which can take advantage inter-frame improve efficiency. presented here relies on grid different from that used pixels represent – hexagonal simplifies task contour Using this grid, an appraoch based differential chain (DCC) while, case, multiple (MGCC) principle proposed. MGCC combines simplification prediction reduce number bits needed shapes. Results alpha plane test sequences are order illustrate performance several modes operation, comparison made with shape-coding tool chosen by MPEG-4.