c# Détecter les Rectangles en Image

Votre meilleure option est d'utiliser le AForge.Net bibliothèque.

Le code suivant est tiré de la documentation de l' ShapeChecker classe, et vous pouvez regarder la documentation pour de plus amples familiariser.

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");
}
}
}
}

De l'entrée d'origine:

La résultante de l'image:

OriginalL'auteur Greg Buehler