Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Reexamination Certificate
2006-03-17
2009-06-16
Kassa, Yosef (Department: 2624)
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
C382S275000, C382S282000, C358S003260, C358S003270
Reexamination Certificate
active
07548661
ABSTRACT:
A system and process for determining the vignetting function of an image and using the function to correct for the vignetting is presented. The image can be any arbitrary image and no other images are required. The system and process is designed to handle both textured and untextured segments in order to maximize the use of available information. To extract vignetting information from an image, segmentation techniques are employed that locate image segments with reliable data for vignetting estimation. Within each image segment, the system and process capitalizes on frequency characteristics and physical properties of vignetting to distinguish it from other sources of intensity variation. The vignetting data acquired from segments are weighted according to a presented reliability measure to promote robustness in estimation.
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Guo Baining
Kang Sing Bing
Lin Stephen
Zheng Yuanjie
Kassa Yosef
Lyon Richard T.
Lyon & Harr LLP
Microsoft Corporation
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