c＃检测图像中的矩形

Question

I'm looking to detect and get a array of Rects, one for each rectangle, in the image below. How might I do this in c#?

Basically I'm trying to scan the image taken of the screen and parse the array of windows.

Rect being some form of (xloc,yloc,xsize,ysize) Returned array: rectangles = ParseRects(image);

Answer 1

Your best option will be to use the AForge.Net library .

The following code is derived from the documentation for the ShapeChecker class, and you may want to look at the documentation to further familiarize yourself.

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");
            }
        }
    }
}

The original input:

The resultant image:

Answer 2

You can see the line Detection by Hough transformation and Corner detection. Some algorithms have probably already been implemented in C#