I have a utility I'm testing with a few other people, that takes screenshots of another window and then uses OpenCV to find smaller images within that screenshot.
That's working without a problem, however, I'm trying to make it more efficient, and was wondering, rather than taking a screenshot of the window every X milliseconds, if there was a way I could "stream" the screen to my app, and then run a function against every new frame that comes through.
This is my current code:
public static bool ContainsImage(Detection p_Detection, out long elapsed) { Stopwatch stopWatch = new Stopwatch(); stopWatch.Start(); Image<Gray, byte> imgHaystack = new Image<Gray, byte>(CaptureApplication(p_Detection.WindowTitle)); Image<Gray, byte> imgNeedle = new Image<Gray, byte>(p_Detection.Needle); if (imgHaystack.Width >= p_Detection.Settings.Resolution || imgHaystack.Height >= p_Detection.Settings.Resolution) { imgHaystack = imgHaystack.Resize(imgHaystack.Width / p_Detection.Settings.Scale, imgHaystack.Height / p_Detection.Settings.Scale, Emgu.CV.CvEnum.Inter.Area); imgNeedle = imgNeedle.Resize(imgNeedle.Width / p_Detection.Settings.Scale, imgNeedle.Height / p_Detection.Settings.Scale, Emgu.CV.CvEnum.Inter.Area); } if (imgNeedle.Height < imgHaystack.Height && imgNeedle.Width < imgHaystack.Width) { using (Image<Gray, float> result = imgHaystack.MatchTemplate(imgNeedle, Emgu.CV.CvEnum.TemplateMatchingType.CcoeffNormed)) { result.MinMax(out double[] minValues, out double[] maxValues, out Point[] minLocations, out Point[] maxLocations); if (maxValues[0] > p_Detection.Settings.MatchThreshold) { stopWatch.Stop(); elapsed = stopWatch.ElapsedMilliseconds; imgHaystack.Dispose(); imgNeedle.Dispose(); return true; } } } stopWatch.Stop(); elapsed = stopWatch.ElapsedMilliseconds; imgHaystack.Dispose(); imgNeedle.Dispose(); return false; } I'm not entirely sure that this is the most efficient way to accomplish what I'm attempting, any help would be brilliant.
Thank you.
1 Answers
Answers 1
Maybe you can use Desktop Window Manager and DwmRegisterThumbnail?
Take a look at the following example and see if it can work for you.
It's a really fast way of streaming the image of another window, just like the preview image in the task bar. Not sure it's practical for image analysis though.
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