I give you code generate edge detection an image processing using sobel algorithm which based on kernel matrix. it is not used matlab toolbox but handmade. so feel free to use it.-I give you code generate edge detection on an image processing using

实用的matlab代码：中值滤波器；用Sobel算子和拉普拉斯对图像锐化；梯度算子检测边缘；LOG算子检测边缘；Canny算子检测边缘-Practical matlab code: median filter Sobel operator and Laplacian image sharpening gradient edge detection operator LOG operator to detect the edges Canny edge detection operator