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How to use opencv to find circles

asked 2013-10-03 05:46:02 -0500

I get a picture,but it's format is YUV422,I want to find circles in it,how should I do? Thank you!

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Try HoughCircles. Should work(:

rockinfresh gravatar imagerockinfresh ( 2013-10-03 06:45:57 -0500 )edit

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answered 2013-10-03 08:22:08 -0500

ThomasB gravatar image

updated 2013-10-03 08:23:04 -0500

Adopt this code: http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/hough_circle/hough_circle.html#code

To operate with YUV422 images, try the following modification to the mentioned code sample;

Mat src, src_gray;

src = imread(argv[1], CV_LOAD_IMAGE_GRAYSCALE);

if( !src.data )
{ return -1; }

// YUV422 has 1.5 times the height of the captured frame when read as grayscale, thus you can extract the grayscale by using the two upper thirds of the image only
Rect grayscaleImageAra(0,0,src.cols, src.rows*2/3);
src_gray = src(grayscaleImageAra); // crop the Grayscale part fromt he YUV422 image


// FROM THIS LINE UNCHANGED CODE FROM http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/hough_circle/hough_circle.html#code
/// Reduce the noise so we avoid false circle detection
GaussianBlur( src_gray, src_gray, Size(9, 9), 2, 2 );

// ..... //
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Asked: 2013-10-03 05:46:02 -0500

Seen: 299 times

Last updated: Oct 03 '13