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Larger screens (eg tablets) may be slow due to the amount of data being processed.
Read more about the app at http://www.barrythomas.co.uk/machinevision.html - Source code of the key sections of the frame processing loop are on the web site.
The app was written mainly as a learning exercise and is provided with no guarantee of road worthiness or fitness for purpose. Let me know if you want to see the code.
Tags: opencv demo, opencv, houghlines, opencv circle detection, opencv hough, houghcirclesjavaopencv, hough circle, opencv code, opencv contour, opencv houghcircles.
v1.75, v1.76 Bugfix: position of mode buttons on screen read incorrectly on screens other than 800 x 480.
v1.73 Canny, Hough Lines and Hough Circles grouped together (just touch the buttons on the right to swap views); view R, G or B channels - touch the coloured button to swap view; colour contour / ellipse / min-enclosing circle grouped together - touch yellow button to swap view.