关键词: 图像分割, 局部阀值法, 最小化分区, 密度函数

Abstract: This article comes up with a medical image segmentation algorithm based on partial threshold method.In X-ray medical image，the target has a wide dynamic range and the overlapping interval of the target and the background gray is large.This article first enhances the featured texture of the target，and then adopts the minimized partition including the target zone，and at last partial threshold method will be incorporated with density function to segment the image.The experiment reveals that this method can effectively separate the bone image of medical pictures.

Key words: image segmentation, partial threshold method, minimized partition, density function