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How to get the size or area of a contour upon touch

asked 2013-07-29 10:13:24 -0500

brianmuks gravatar image

updated 2013-07-31 19:46:11 -0500

I am new to openCV functionality , I need help on how I can get the size of the contour and if possible crop the touched part and save.I have checked for the solution on Google as well as StackOverFlow. Any link to a tutorial will be highly appreciated.

UPDATE: I am using the color-blob detector sample code,Please help.I have tried this:

  List<MatOfPoint> con = mDetector.getContours();
  double size = Imgproc.contourArea((Mat) con);

  String Stringsize =Double.toString(size);
  Toast.makeText(this, Stringsize, Toast.LENGTH_SHORT).show();
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describing, how far you are, and what you tried would be very helpful, (mentioning, you did not find a readymade anywhere is NOT)

berak gravatar imageberak ( 2013-07-29 10:49:35 -0500 )edit

Like @berak said, there won't be a ready to use solution on the net available. You will have to reason and think for yourself. If I was you I would start by looking how to capture mouse activity with openCV. Just a simple search on this forum will already give you the answer.

StevenPuttemans gravatar imageStevenPuttemans ( 2013-08-01 02:33:39 -0500 )edit

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answered 2013-08-01 03:11:26 -0500

berak gravatar image

ah, if you're starting from the colorblob sample, you're actually pretty close already ;)

you just take the boundingRect from your contour, extract the submat from your image, and imwrite that to sdcard.

don't forget the write permission!

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Asked: 2013-07-29 10:13:24 -0500

Seen: 789 times

Last updated: Aug 01 '13