从OpenCV Canny边缘检测器获取角度 [英] Get angle from OpenCV Canny edge detector

问题描述

我想使用OpenCV的Canny边缘检测器，例如概述的问题.例如:

I want to use OpenCV's Canny edge detector, such as is outlined in this question. For example:

cv::Canny(image,contours,10,350); 

但是，我不仅希望获得最终的阈值图像，而且还希望获得每个像素处检测到的边缘角度.这在OpenCV中可能吗?

However, I wish to not only get the final thresholded image out, but I also wish to get the detected edge angle at each pixel. Is this possible in OpenCV?

推荐答案

canny不能直接为您提供此功能. 但是，您可以通过canny()内部使用的Sobel变换来计算角度.

canny doesn't give you this directly. However, you can calculate the angle from the Sobel transform, which is used internally in canny().

伪代码:

    cv::Canny(image,contours,10,350);
    cv::Sobel(image, dx, CV_64F, 1, 0, 3, 1, 0, cv::BORDER_REPLICATE);
    cv::Sobel(image, dy, CV_64F, 0, 1, 3, 1, 0, cv::BORDER_REPLICATE);

    cv::Mat angle(image.size(), CV_64F)

    foreach (i,j) such that contours[i, j] > 0
    {
        angle[i, j] = atan2(dy[i,j], dx[i , j])
    }

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