how to solve the following error in c# using AForge.net while detecting shapes in an image : "Error 2 Argument '2': cannot convert from 'AForge.IntPoint[]' to 'System.Drawing.PointF[]' whr marked bold

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C#

Bitmap image = (Bitmap)pictureBox4.Image;
// create instance of blob counter
BlobCounter blobCounter = new BlobCounter();
blobCounter.FilterBlobs = true;
blobCounter.MinHeight = 5;
blobCounter.MinWidth = 5;
//process the dilated image
blobCounter.ProcessImage(image);
// get info about detected objects
Blob[] blobs = blobCounter.GetObjectsInformation();

// create a graphics object to draw on the image and a pen
Graphics g = Graphics.FromImage(image );
Pen Redpen = new Pen(Color.Red, 2);

SimpleShapeChecker shapechecker= new SimpleShapeChecker ();

//check in image and draw around the object found as rectangle
for(int i=0,n=blobs.Length ;i<n;i++)>
{
List<intpoint> edgepoints = blobCounter.GetBlobsEdgePoints(blobs [i ]);
List <intpoint> cornerpoints;
if (shapechecker.IsQuadrilateral(edgepoints, out cornerpoints ))
{
if (shapechecker.CheckPolygonSubType (cornerpoints ) == PolygonSubType.Rectangle)
{
g.DrawPolygon (Redpen, cornerpoints.ToArray ());
}

}
}
Redpen.Dispose();
g.Dispose();