以中介真值程度的数值化度量为基础，通过引入距离比率函数度量像素点的灰度以及像素点间灰度的相似程度，并采用双域值和非局部极大值抑制方法，设计了新的图像边缘检测算法。通过仿真实例，与已有的典型算法处理结果比较表明,基于中介真值程度度量的图像边缘检测算法能有效去除噪声,并较好地保持图像边缘细节，因而更具有实用性和有效性。

Based on the distance ratio function to measure the gray level of a single pixel and the similarity between two pixels, this paper presents a novel image edge detection algorithm based on the measuring of medium truth scale. Two thresholds and restraint on non-maxim value in domain are applied to the algorithm. Simulation results show that the algorithm can successfully remove noise, preserve the image edge details and is more effective and has wider applications compared with the classic algorithms.