CODEWITHSUNDEEP
opencvtrackingemgucvdetection
Aaron de Windt
Aaron de Windt

Reputation: 17708

How do I detect squares/rectangle or an other shape with EMGU CV?

I want to make an apps detect an square/rectangle in my webcam using EMGU CV (an OPENCV wrapper). The square/rectangle will have a solid color.

if it's posible I would like to obtain the width and heigth of the square/rectangle

In this video you can see what I would like to do.
http://www.youtube.com/watch?v=ytvO2dijZ7A&NR=1

I'm working with C#

Upvotes: 0

Views: 6496

Answers (2)

Chris
Chris

Reputation: 3482

In the video link provided what is probably being done is Surf feature detection. Take a look at the SURFFeture example that ships with EMGU. Rather than drawing lines in this case however the four corner points are detected and a shape drawn on top. Similar examples which will help you are ShapeDetection and TrafficSignRecognition both in the EMGU.CV.Examples folder. ShapeDetection will teach you how to classify the square and the StopSignDetector.cs class will show you another example of how to apply a surf feature detection algorithm.

It will require a little reconfiguration but if you get stuck feel free to ask another question.

Cheers

Chris

Upvotes: 1

monksy
monksy

Reputation: 14234

If you already know the color of the desired object then you can segment the image based on that color. (Which may be why the rectangle disapears when the guy movies the direction to and away from the camera [differences in lighting]. Once you have the object segmented out of the image you can do region calculations on the image. [In matlab think regionprops]

Once you have the blob you can attempt to do model fitting to get a good approximation of the object being represented.

Upvotes: 3

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