用delphi对数字图像进行预处理，包括图像的灰度化，二值化，反色，中值滤波，高斯滤波，gabor变换，二值图像和灰度的腐蚀，膨胀，以及图像的sobel，prewitt，robert，kirsch，laplace，canny，marr边缘检测-Use delphi for digital image preprocessing, including image gray-oriented, thresholding, anti-color, median filtering, Gaussian

canny edge detector is the best edge detection in the image processing field.in the first guassian blur in the image and then use sobel filter to get magnitude image