Dynamic ] gives the continually updated current mouse position. You can also get the value of the actual pixel using img.at(y,x) (replace Vec3b for other image types). Luckily talking to Windows API is rather straightforward. If your program is 320 pixels wide and 240 pixels high, coordinate 0, 0. To be able to find out the mouse position, we have to use calls to the Windows API. For more information check the highgui module (you can add overlays, texts, trackbars, buttons, etc). Processing uses a Cartesian coordinate system with the origin in the upper-left corner. The event variable contains events like mouse clicks. left click mouse to capture the area MessageBox will display results Press Esc to exit. position crosshair and right click mouse to anchor it 2. X and y are image coordinates, not in screen coordinates (so they follow zoom, etc). Reports position and size of selected rectangle To select area: 1. NamedWindow("Image",WINDOW_NORMAL|WINDOW_KEEPRATIO) the coordinates will be in x and y variables Then you can use dist () as if it where 2D to find out whether the mouse is on it or not. This is useful to get the screen position of the center. this function will be called every time you move your mouse over the image screenX () Takes a three-dimensional X, Y, Z position and returns the X value for where it will appear on a (two-dimensional) screen. Static void onMouse(int event,int x,int y,int,void*) The following code will display a crosshair at the mouse position: #include I'm not sure if I understood you correctly, but maybe you want to use the mouse callbacks. If I play the Processing code 1st, Ill get a Serial COM3 already in use on Arduinos serial monitor and it wont display me any coordinates from the mouse This is to be expected. The above reasons are why I am looking for an OpenCV function to give me cursor coordinates derived from an OpenCV image. Event processing works differently: by default, after a mouse or key action is.
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