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Question by hoffmanuel · Nov 07, 2012 at 08:31 AM · trackingopencvemgucv

LED Tracking with Unity & emguCV

Hi!

I am currently working on a project, where i am trying to track four LED's with a camera. When a LED is found in the camera image it shall be tracked immediately. For the beginnning it should work with four LED's, later it should be irreleveant, how many LED's there are.

The programm should get the coordinates of the four LED's so that i can work with that.

I have tried a first approach with binary tresholding and contour finding, but that creates errors, like points found anywhere else.

Does anyone have a maybe better approach?

br

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avatar image deltamish · Nov 07, 2012 at 08:39 AM 0
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Be a bit more clear when you ask question. By track do you mean to follow a object then change if you press some button then follow another object

avatar image hoffmanuel · Nov 07, 2012 at 08:40 AM 0
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I will write the question more precise.

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Answer by hoffmanuel · Apr 18, 2013 at 08:09 AM

The detection is working now. Code:

 Image<Gray, Byte> cannyImage = _capture.QueryGrayFrame().ThresholdBinary(new Gray(250), new Gray(255)).Canny(new Gray(255).Intensity, new Gray(255).Intensity);
 int count = 0;
 
 for (Contour<Point> contours = cannyImage.FindContours(
                 Emgu.CV.CvEnum.CHAIN_APPROX_METHOD.CV_CHAIN_APPROX_SIMPLE,
                 Emgu.CV.CvEnum.RETR_TYPE.CV_RETR_EXTERNAL); contours != null; contours = contours.HNext)
 {
     float x = (float)contours.BoundingRectangle.X;
     float y = (float)contours.BoundingRectangle.Y;
     ....
 }
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avatar image hoffmanuel · Apr 18, 2013 at 08:10 AM 0
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The treshold is so high, because i am working with infrared

avatar image alexispolak · Mar 30, 2016 at 03:43 PM 0
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do you have any tutorial or guide or something like that ? I'm trying to do this too, but using the smartphone camera with Unity in Android

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