Canny Edge 的自适应参数 [英] Adaptive parameter for Canny Edge

问题描述

我正在使用一个使用 OpenCV 的项目来检测将放置在桌子上的卡片.我已经使用 Canny Edge 成功检测到它.但是，对于不同的图像，必须手动调整参数.我希望我的项目能够处理每个图像，而无需手动调整参数.我该怎么办?

I'm using a project using OpenCV for detecting a card that will be place on a atable. I have successfully detect it using Canny Edge. However, for different image the parameter must be tuned manually. I wish for my project to be worked with every image without manually tune the parameter. What Should I do?

推荐答案

如果您的图像由 Distinct Background &前景，您可以按照本文中的说明自动获取阈值 http://www.academypublisher.com/proc/isip09/papers/isip09p109.pdf.

If your image consist of Distinct Background & Foreground, You can get the threshold for that automatically as follows explained in this paper http://www.academypublisher.com/proc/isip09/papers/isip09p109.pdf.

1. 为您的图像计算 Otsu 阈值 + 二进制阈值.
2. 使用 Otsu 的阈值作为 Canny 算法的更高阈值.

代码:

Mat mCanny_Gray,mThres_Gray;
Mat mSrc_Gray=imread("Test.bmp",0);

double CannyAccThresh = threshold(mSrc_Gray,mThres_Gray,0,255,CV_THRESH_BINARY|CV_THRESH_OTSU);

double CannyThresh = 0.1 * CannyAccThresh;

Canny(mSrc_Gray,mCanny_Gray,CannyThresh,CannyAccThresh);
imshow("mCanny_Gray",mCanny_Gray);

您也可以参考 这个话题.

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