说明：  检测图像的边缘： 用Prewitt算子检测图像的边缘 ，用不同σ值的LoG算子检测图像的边缘 ，用Canny算子检测图像的边缘 ，图像的阈值分割 ，用水线阈值法分割图像 ，对矩阵进行四叉树分解 ，将图像分为文字和非文字的两个类别 ，形态学梯度检测二值图像的边缘 ，形态学实例——从PCB图像中删除所有电流线，仅保留芯片对象
(Image edge detection: edge detection using Prewitt edge images, with different σ value Log Operators image edge detection using Canny operator image edge detection, image thresholding, water line thresholding segmentation images, of the matrix quadtree decomposition, the image is divided into text and non-text of two categories, the morphological gradient detection of the edge binary image, morphology examples- from PCB image delete all current lines, retaining only the target chip)