说明：  分析了Canny算子的优缺点, 针对经典Canny 算子的不足, 对参数的选择作了分析并采用一维熵方法选择阈值, 改善了边缘检测的效果。
(Canny operator analyzes the advantages and disadvantages of the classic Canny operator for the lack of an analysis of the choice of parameters and using one-dimensional entropy method selection thresholds, improved edge detection results.)