C# Class AForge.Imaging.Filters.HistogramEqualization

Histogram equalization filter.

The filter does histogram equalization increasing local contrast in images. The effect of histogram equalization can be better seen on images, where pixel values have close contrast values. Through this adjustment, pixels intensities can be better distributed on the histogram. This allows for areas of lower local contrast to gain a higher contrast without affecting the global contrast.

The filter accepts 8 bpp grayscale images and 24/32 bpp color images for processing.

For color images the histogram equalization is applied to each color plane separately.

Sample usage:

 // create filter HistogramEqualization filter = new HistogramEqualization( ); // process image filter.ApplyInPlace( sourceImage );

Source image:

Result image:

Inheritance: BaseInPlacePartialFilter

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Public Methods

Method	Description
HistogramEqualization ( ) : System	Initializes a new instance of the HistogramEqualization class.

Protected Methods

Method	Description
ProcessFilter ( UnmanagedImage image, Rectangle rect ) : void	Process the filter on the specified image.

Private Methods

Method	Description
Equalize ( int histogram, long numPixel ) : byte[]

Method Details

HistogramEqualization() public method

Initializes a new instance of the HistogramEqualization class.

public HistogramEqualization ( ) : System
return	System

ProcessFilter() protected method

Process the filter on the specified image.

protected ProcessFilter ( UnmanagedImage image, Rectangle rect ) : void
image	UnmanagedImage	Source image data.
rect	System.Drawing.Rectangle	Image rectangle for processing by the filter.
return	void