Prewit t 算子和Sobel 算子都是对图像进行差分和滤波运算,仅在平滑部分的权值选择上有些差异,但是图像产生了一定的模糊, 而且有些边缘还检测不出来，所以检测精度比较低, 该类算子比较适用于图像边缘灰度值比较明显的情况。-Prewit t operator and Sobel operator is on image difference and filtering operation, only some differences in the smooth part of the weights of choice, but to the fuzzy image, and some edge detection not to come out, so the accuracy is lower, the operator is applied to image edge gray value is more noticeable.