/// <summary>
/// Draws all blobs to the specified image.
/// </summary>
/// <param name="img">The target image to be drawn.</param>
public void RenderBlobs(Mat img)
{
if (img == null)
{
throw new ArgumentNullException(nameof(img));
}
/*
* if (img.Empty())
* throw new ArgumentException("img is empty");
* if (img.Type() != MatType.CV_8UC3)
* throw new ArgumentException("img must be CV_8UC3");*/
if (Blobs == null || Blobs.Count == 0)
{
throw new OpenCvSharpException("Blobs is empty");
}
if (Labels == null)
{
throw new OpenCvSharpException("Labels is empty");
}
var height = Labels.GetLength(0);
var width = Labels.GetLength(1);
img.Create(new Size(width, height), MatType.CV_8UC3);
var colors = new Scalar[Blobs.Count];
colors[0] = Scalar.All(0);
for (var i = 1; i < Blobs.Count; i++)
{
colors[i] = Scalar.RandomColor();
}
using (var imgt = new Mat <Vec3b>(img))
{
var indexer = imgt.GetIndexer();
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
var labelValue = Labels[y, x];
indexer[y, x] = colors[labelValue].ToVec3b();
}
}
}
}
