//

// Histogram Sample

// This sample shows how to use the Sample Grabber filter for video image processing.



// Conceptual background:

// A histogram is just a frequency count of every pixel value in the image.

// There are various well-known mathematical operations that you can perform on an image

// using histograms, to enhance the image, etc.



// Histogram stretch (aka automatic gain control):

// Stretches the image histogram to fill the entire range of values. This is a \"point operation,\"

// meaning each pixel is scaled to a new value, without examining the neighboring pixels. The

// histogram stretch does not actually require you to calculate the full histogram. The scaling factor

// is calculated from the minimum and maximum values in the image.