Method for sharpening a digital image

Details Method for sharpening a digital image Method for sharpening a digital image

2007-06-05

2007-06-05

Mehta, Bhavesh M. (Department: 2624)

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

C382S263000

Reexamination Certificate

active

10235130

ABSTRACT:
A method of sharpening a digital image having image pixels values includes the steps of: determining a Dminvalue, representing a value corresponding to a minimum possible exposure for a system that produced the digital image; for each pixel value in the digital image providing a gain factor that is dependent on the difference between the pixel value and the Dminvalue, such that pixel values nearer the Dminvalue have smaller gain factors; and using the gain factors to sharpen the digital image.

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