Method to evaluate contrast value for an image and...

Details Method to evaluate contrast value for an image and... Method to evaluate contrast value for an image and...

2011-03-22

2011-03-22

Cunningham, Gregory F (Department: 2624)

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

C348S673000, C348S678000

Reexamination Certificate

active

07912314

ABSTRACT:
An image contrast evaluation method is disclosed. First, focusing is performed based on the contrast value of an image rendered by a lens on optical sensors, wherein the calculation of the contrast value comprises: selecting an area of the image, calculating the absolute value of brightness difference between each neighboring pixel, and selecting a specific value there from as the contrast value of the image based on a distribution of the calculated absolute values of the brightness differences.

REFERENCES:
patent: 6818875 (2004-11-01), Suzuki
patent: 2005/0254727 (2005-11-01), Fedorovskaya
patent: 2007/0216786 (2007-09-01), Hung et al.

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