Conversion to grayscale using emguCV in C#

Question

I am new to EmguCV. I want to convert an rgb image into gray scale. For the conversion I have used the code

Image grayImage = ColordImage.Co         


        

Answer 1

Alternately, if you don't want to use Convert (e.g. in case your ColoredImage is some other data type such as IntPtr), there are numerous constructors available such as:

Image<Gray, byte> grayFrame = new Image<Gray, byte>(width, height, stride, imageData);

Here is a full list:
http://www.emgu.com/wiki/files/2.1.0.0/html/cb45d54d-ebce-44b6-0352-3e1105c0862a.htm

There are also some more examples (including usage of Convert) on the emgu Wiki: http://www.emgu.com/wiki/index.php/Working_with_Images

Answer 2

One simple way is to pass BitMap of color image in the constructor;

Image<Bgr, byte> inputImage = //your original bgr image
Image<Gray, Byte> result = new Image<Gray,byte>(inputImage.Bitmap);

Answer 3

It may depend on the type of colour that ColordImage is.

For instance, this works:

Capture cap = new Capture(1);
Image <Bgr,Byte> ColordImage = cap.QueryFrame();
Image <Gray,Byte> grayImage = ColordImage.Convert<Gray, Byte>();
imageBox1.Image = grayImage;

If you could supply more of your code, it might become more obvious what's going on.

Answer 4

You should paste opencv_imgproc220.dll(if you use emgu cv 2.2.1.1150) to your project bin/debug folder.