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的项目来检测一张卡片，这张卡片会放在一个可折叠的地方。
我已经成功地使用Canny Edge检测它了。但是，对于不同的图像，必须手动调整参数。我希望我的项目可以处理每个图像，而无需手动调整参数。我应该怎么办？

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

如果您的图像包含不同的背景&前台，您可以自动获取阈值，如下所述： 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. 计算Otsu的阈值+二进制阈值



2. 使用Otsu的阈值作为Canny算法的较高阈值。

1. Compute Otsu's threshold + Binary threshold for your image.

2. Use the Otsu's threshold value as higher threshold for Canny's algorithm.

Mat mCanny_Gray，mThres_Gray;

Mat mCanny_Gray,mThres_Gray;

Mat mSrc_Gray = imread（Test.bmp，0）;

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

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

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

double CannyThresh = 0.1 * CannyAccThresh;

double CannyThresh = 0.1 * CannyAccThresh;

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

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

您还可以参考此主题。

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