When I click my mouse on large images, position of the mouse pointer that is returned is wrong. How do I get the correct position when I clicked mouse on large image? I don't prefer to use cv_window_keepratio* to adjust the window.
Update
My images is 1600 x 1000, my screen is 1366 x 768
Basically, the namedWindows generated by openCV only work well within the ranges of your screen resolution. Many topics mention that coördinates go wrong when going over that range.
Look at : http://answers.opencv.org/question/9284/drawing-limited-by-size-of-int-in-opencv/
Simple solution is like I already suggested in the suggested topic, using region of interest and looping over your large images in specific windows. It is the only OpenCV way to get 100% correct coördinates inside larger images. I am using it for 25000 x 25000 pixels and it works perfectly.
Mat window = inputImage( Rect( x, y, width, heigth) );
Basically the problem is the way the functionality is written. I do not feel like updating the source code, but just using this simple roi approach, since displaying images larger than your screen is basically useless.
Looking at your ratio comment, I would suggest splitting your image into 4 containers and loop over them. Please try this and tell us if it helped.
Ok listen now, just keep repeating you can't is stupid, since this code is running for me. Basically you want code else you wont stop telling it is wrong. Take a look at this pseudo code.
Mat large = Mat(1600, 1000, CV_8UC1
int stepsize_width = 800;
int stepsize_height = 500;
for(int i = 0; i < 2; i++){
for(int j = 0; j<2; j++){
Rect region_of_interest(i*step_width, j*step_heigth, width, heigth);
Mat small = large(region_of_interest);
// Process here - add coordinates
// Do not forget to add width and height to your retrieved coordinates depending on which window you are at.
}
}
Asked: 2013-04-09 10:33:00 -0600
Seen: 2,225 times
Last updated: Apr 11 '13