How to create a histogram

c# image histogram emgucv
White Dwarf picture White Dwarf · Feb 5, 2011 · Viewed 15.4k times · Source

I want to create a histogram within a C# program that uses EMGU. EMGU contains a class called MCvHistogram in it, but I don't know how to use it.

Answer

Luca Del Tongo picture Luca Del Tongo · Feb 5, 2011

You should use DenseHistogram class if you want to use EmguCV. I'll show you basic usage:

  // Create a grayscale image
  Image<Gray, Byte> img = new Image<Gray, byte>(400, 400);
  // Fill image with random values
  img.SetRandUniform(new MCvScalar(), new MCvScalar(255));
  // Create and initialize histogram
  DenseHistogram hist = new DenseHistogram(256, new RangeF(0.0f, 255.0f));
  // Histogram Computing
  hist.Calculate<Byte>(new Image<Gray, byte>[] { img }, true, null);

There are a lot of other common methods inside DenseHistogram class such as Back Projection

Related questions

How to resize an Image C#

As Size, Width and Height are Get() properties of System.Drawing.Image; How can I resize an Image object at run-time in C#? Right now, I am just creating a new Image using: // objImage is the original Image Bitmap objBitmap = …

Read More
Setting WPF image source in code

I'm trying to set a WPF image's source in code. The image is embedded as a resource in the project. By looking at examples I've come up with the below code. For some reason it doesn't work - the image …

Read More
Load image from resources area of project in C#

I have an image in my project stored at Resources/myimage.jpg. How can I dynamically load this image into Bitmap object?

Read More