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说明：  MATLAB图像处理源程序4： P0401：用Prewitt算子检测图像的边缘 P0402：用不同σ值的LoG算子检测图像的边缘 P0403：用Canny算子检测图像的边缘 P0404：图像的阈值分割 P0405：用水线阈值法分割图像 P0406：对矩阵进行四叉树分解 P0407：将图像分为文字和非文字的两个类别 P0408：形态学梯度检测二值图像的边缘 P0409：形态学实例——从PCB图像中删除所有电流线，仅保留芯片对象 (MATLAB image processing source code: P0401: Prewitt operator to detect image edge P0402: different sigma value LoG operator image edge detection P0403: Canny operator to detect image edge P0404: image thresholding segmentation P0405: water of line thresholding segmentation image segmentation P0406: matrix quadtree decomposition P0407: image into text and non-text two categories P0408: morphological gradient detection Binary Image Edge P0409: morphological instance,- Images from the PCB Remove all current lines, retaining only chip targets)