目前计算机图象处理技术中，边缘检测已有许多成熟的算法、能较好地完成图象分割的任务。但在医学图象中、有些病变区域的边缘很难确定，人眼判断有很大的主观性。用传统的边缘检测技术不会取得好的检测效果。为此，本文针对胃镜图象中胃溃疡边缘的自动检测提出了一种径向搜索算法、成功地解决了计算机自动边缘检测问题，为病变区域的判别与测量提供了客观依据。 In the current computer image processing technology, there are many mature algorithms for edge detection, which can accomplish the task of image segmentation well. However, in medical images, the edge of some lesion areas is difficult to determine, and the human eye has a great subjectivity. With the traditional edge detection technology will not achieve good detection results. To this end, this paper presents a radial search algorithm for automatic detection of gastric ulcer edge in gastroscopic images, which successfully solves the problem of computer automatic edge detection and provides an objective basis for the identification and measurement of the lesion area.