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
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