Here we can iterate through each blob and use the slider Uint numWebcamBlobsFound = bDetect.Detect(greyThreshImg, resultingImgBlobs) Image greyThreshImg = greyImg.ThresholdBinaryInv(new Gray(150), new Gray(255)) Įmgu.CV.Cvb.CvBlobs resultingImgBlobs = new Emgu.CV.Cvb.CvBlobs() Įmgu.CV.Cvb.CvBlobDetector bDetect = new Emgu.CV.Cvb.CvBlobDetector() you could also do cool things like threshold only certain colors this will esentially eliminate the color differences We again threshold it based on brightness.BUT WE INVERT THE PNG. This takes our nice looking color png and
The in the main rendering event handler. _blobsImg = new Emgu.CV.Image ("photos/transparentBlobsTest.png") First we load in our image on the button press. No problem, we can fix that straight out of the Emgu CV examples:
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Lets first look at the relevant Image blob detection code:ĭOWNLOADS: Download the Visual C# 2010 Express Example Application WPF IMAGE CONVERSION CODE:ĭrat, Emgu CV operates on images in formats that cannot be easily displayed in WPF applications. The meat of this small application takes place in a CompositionTarget.Rendering event that fires continuously and preforms actions on the image or on the webcam based on user selection. I have provided my own Visual Studio Express 2010 圆4 c# wpf project in a download below without the EmguĬV dll's that you will need to obtain from the project download at sourcefourge. In this example we will be taking raw input from either your systems default webcam or a provided transparent png.
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As of Emgu CV version 2.4 the cvblob library for generic blob tracking hasīeen in there, but there aren't any examples about how to use it. My objective here is just to track groups of white pixels that show up in our images and accept or ignore them based on their size. Human features, colored objects, animals in your yard, custom multi-touch rigs, extending Kinect For Windows capability, and many many more applications.Įmgu CV comes with a great example on blob tracking called "video surveillance", but that implementation seems to be about tracking much more specific featured blobs.
This may sound kind of dumb but it has a zillion applications such as tracking Powerful openCV computer vision platform.īlob tracking in computer vision speak basically means tracking certain things around on the screen. Emgu CV is a great project that allows managed. In this article I will show you how to do generic computer vision blob tracking in Windows Presentation Foundation The title of this article is a bit of acronym soup if you are not familiar with the technologies so let me explain.