Displaying OpenCV Points using Qt

[imagyne]

Hi,

Using OpenCV, I have calculated image features, which are stored in a data structure of points. I have to display those point coordinates as circles on the image open in Qt.

I am unable to convert the coordinates of the OpenCV points to Qt.

This is how I am able to display the points in OpenCV (taken from the OpenCV codebook)

void drawOnImage(cv::Mat &image, const std::vector<cv::Point> &points, cv::Scalar color= cv::Scalar(255,255,255), int radius=1, int thickness=1) {
		  std::vector<cv::Point>::const_iterator it= points.begin();
 
		  // for all corners
		  while (it!=points.end()) {
 
			  // draw a circle at each corner location
			  cv::circle(image,*it,radius,color,thickness);
			  ++it;
		  }
	  }

void drawOnImage(cv::Mat &image, const std::vector<cv::Point> &points, cv::Scalar color= cv::Scalar(255,255,255), int radius=1, int thickness=1) {
		  std::vector<cv::Point>::const_iterator it= points.begin();

		  // for all corners
		  while (it!=points.end()) {

			  // draw a circle at each corner location
			  cv::circle(image,*it,radius,color,thickness);
			  ++it;
		  }
	  }

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Now, I want to pass the const std::vector<cv::Point> &points to the mainwindow.h and then in mainwindow.cpp, using the coordinates of the points, print them on the Qt image using Qt Ecllipse tool.

Anyone can help? Thanks!

[d_stranz]

So what are the units of cv::Point? Pixels? Points? Fractions of image width? Megaparsecs? If a cv::Point describes a location in the image, there is certainly a conversion between that location and the corresponding location in the image after conversion to QImage or QPixmap.

You will likewise need to convert "radius" from its units in cv-space to pixels in Qt image space.

[imagyne]

Done, thank you.