以下代码派生自ShapeChecker类的文档,您可能需要查看文档以进一步了解您自己.

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<IntPoint> edgePoints = blobCounter.GetBlobsEdgePoints(blob);
        List<IntPoint> 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<Point> Points = new List<Point>();
                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");
            }
        }
    }
}

原来的输入：

得到的图像：