of the image near the boundary locations application_number US 85799307 A description fig1 is a block diagram illustrating an embodiment of an image enhancement system 10 the image enhancement system 10 can have an image input component 12 an enhancement component 16 can perform several types of enhancement preferably including convolution type enhancement other types of enhancement can be performed by the enhancement component 16 including without limitation image sharpening and noise reduction the system can further comprise a variance calculator 14 described in greater detail below a mixer component 18 can receive the original image from the image input 12 as well as input from the enhancement component 16 and the variance calculator 14 the mixer component 18 combines the input from disparate sources to create an output image 20 other components can be added to the system including those that prepare the image to be input at the image input 12 or are its source the mixer component 18 can also receive input from other sources as well with reference to fig2 a a sample of convolution type image processing is displayed an interaction region 50 a being altered by a method of image processing is displayed a pixel block 52 a can be the focus of processing the pixel block 52 a can be a single pixel or any group or collection of pixels into which an image is discretely divided for processing some image processing methods apply a routine or algorithm iteratively.