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PODetect small rectangles in image AForge
 

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    <p>I'm trying to detect rectangles on this image:</p> <p><img src="https://i.stack.imgur.com/ON1rH.png" alt="enter image description here"></p> <p>with this code: </p> <pre><code>static void Main(string[] args) { // Open your image string path = "test.png"; Bitmap image = (Bitmap)Bitmap.FromFile(path); // locating objects BlobCounter blobCounter = new BlobCounter(); blobCounter.FilterBlobs = true; blobCounter.MinHeight = 5; blobCounter.MinWidth = 5; blobCounter.ProcessImage(image); Blob[] blobs = blobCounter.GetObjectsInformation(); // check for rectangles SimpleShapeChecker shapeChecker = new SimpleShapeChecker(); foreach (var blob in blobs) { List&lt;IntPoint&gt; edgePoints = blobCounter.GetBlobsEdgePoints(blob); List&lt;IntPoint&gt; cornerPoints; // use the shape checker to extract the corner points if (shapeChecker.IsQuadrilateral(edgePoints, out cornerPoints)) { // only do things if the corners form a rectangle if (shapeChecker.CheckPolygonSubType(cornerPoints) == PolygonSubType.Rectangle) { // here i use the graphics class to draw an overlay, but you // could also just use the cornerPoints list to calculate your // x, y, width, height values. List&lt;Point&gt; Points = new List&lt;Point&gt;(); foreach (var point in cornerPoints) { Points.Add(new Point(point.X, point.Y)); } Graphics g = Graphics.FromImage(image); g.DrawPolygon(new Pen(Color.Red, 5.0f), Points.ToArray()); image.Save("result.png"); } } } } </code></pre> <p>but it dont recognize the rectangles (walls). It just recognize the big square, and when I reduce the minHeight and minWidth, it recognize trapezoids on the writing..</p>
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