Opencv: Working with 16bit image, Uint16

Question

I have a 12bit image that I want to work with in Opencv, such as detecting blobs etc.

The image is now a Uint16 array. And i want to convert it to Opencv Mat or Iplimage. I need to do that inorder to threshold and detect blobs.

What im doing is to convert the ushort array to bitmap, and then to Mat using opencv extensions, see below.

ushort[,] red = new ushort  [480,640];
//Grab image in to ushort array
//..
 bmpred = U16ArrayToBitmap(red);
 Mat redMat = new Mat();
 redMat = OpenCvSharp.Extensions.BitmapConverter.ToMat(bmpred);

Now redMat, my Mat image is U8C4, as I understand its 4 Chanel Unsigned 8 bit. This wont work for me, because I want to use all of the 12 bits!

Is it possible to convert a ushort array or a bitmap into a 16bit grayscale Mat or iplimage?

Thanks!

Answer 1

You can use Mat constructor directly:

var mat = new Mat(red.GetLength(0), red.GetLength(1), MatType.CV_16UC1, red);

Or use a MatOfUShort:

var mat = new MatOfUShort(red.GetLength(0), red.GetLength(1), red);

Note that mat is using a pointer to red array. Clone mat if you want to use a copy:

var clone = mat.Clone();

For more information check Mat - The Basic Image Container OpenCV documentation page and OpenCvSharp Wiki.