Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Reexamination Certificate
2006-09-26
2006-09-26
Couso, Yon J. (Department: 2625)
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
C382S254000
Reexamination Certificate
active
07113648
ABSTRACT:
In a contrast correcting apparatus1which divides an image into unit regions and carries out a contrast correction for each of unit regions, a gray level histogram calculation section201generates gray level histograms of the image, and a scene judgment section202makes a judgment on the state of the image. When the result of the judgment shows that the image is in a state such as overexposure, underexposure, low contrast or high contrast, a region size determining section204sets a greater size as the size of the unit regions. Based upon the size of the unit regions thus determined and the amount of contrast correction determined by the contrast correction amount determining section203, gray level transformation curves are formed for the respective unit regions, and by using these, the contrast corrections are carried out on the respective unit regions. With this method, it is possible to properly reduce the occurrence of unevenness in gray levels in an image that tends to arise in the case when the size of the unit regions is small although the amount of contrast correction (the amount of emphasis) is great.
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Buchanan & Ingersoll PC
Couso Yon J.
Minolta Co. , Ltd.
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