在图像编码系统中，为了获得较好的解码质量，提出了一种新的基于基准线的形状编码算法。该算法首先采用1维数据描述2维形状信息，并借助形状轮廓来抽取距离集和拐点；然后采用DPCM对距离集和拐点进行编码，从而有效地节约了码流。实验结果表明，该算法不仅能够适应各种特殊的形状边界走向，具有很好的重构效果，而且能有效克服基于块的形状编码所产生的阶梯效应问题。

A new baseline based shape coding algorithm is designed in this paper. Distance set and turning point are chosen from the shape contour，and coded by DPCM. So the 2 dimensional data can be described by 1 dimensional data，and K K reduce the bit streams effectively. The algorithm can adapt to every particular boundary trend，and gives a better reconstructed effect〖JP〗The reconstructed shape only has a geometrical error，and can overcome the ladder effect which always appears in the block based shape coding