A series of algorithms has been developed for conversion of grayscale to bitonal images. A configurable prefilter en-hances the image quality.
 

Two binarization algorithms are available:
 

	an algorithm using a configurable threshold for the entire image
	an algorithm using an adaptive threshold. The threshold is calculated from a 5x5 pixel window around a center pixel

The algorithms consist of the following components:
 

	a control function handling an entire image with user supplied parameters for the used filter and binarization
	optimized assembler functions for the individual algorithms

The algorithms use the C6400 EDMA controller to move the image data from external to internal memory and vice versa.