关键词: 染色体, 图像分割, 链码, 凹点

Abstract: Getting the correct segmentation-point is a major step toward the segmentation of touching and overlapping chromosomes，when analyzing and recognizing chromosome images.This paper applies a calculating method of edge chain-code to find the concave points correctly which segmentation points belong to，that is to say the candidate segmentation points.And then the right ones are estimated and selected by the distance threshold among segmentation points，as well as the arc threshold of edge.At the same time，it introduces a proper theory for two chromosomes which touching head-to-head or head-to-end.

Key words: chromosome, image segmentation, chain code, concave points