中文摘要：

鉴于经典Canny算法在脑部CT图像应用中存在的问题和缺陷,在深入分析经典Canny算法执行步骤的基础上,提出了一种改进的边缘检测方法,即用中值滤波与高斯滤波相结合,替代传统Canny算子的单一高斯滤波;用迭代算法自动计算阈值,替代经验固定阈值。实验结果表明,改进方法比传统方法更具准确性与普适性,减少了边缘错检、漏检的情况。

英文摘要：

In order to overcome the problems and deficiencies caused by traditional canny operator segmentation algorithm in the application of brain CT,an improved method of image edge detection is introduced in the paper. This method uses median filter in combining with Gaussian filtering after analysis of traditional canny operator segmentation algorithm. To replace the fixed threshold,interative algorithm is used to calculate the threshold. Experimental results show that the proposed method possesses better ability of accuracy and universal and lower rate of wrong detection and miss detection than the traditional methods.