System and method for providing gradient preservation for...

Details System and method for providing gradient preservation for... System and method for providing gradient preservation for...

2011-05-17

2011-05-17

Wu, Jingge (Department: 2624)

Image analysis

Image enhancement or restoration

C392S488000, C392S488000

Reexamination Certificate

active

07945107

ABSTRACT:
The present invention provides gradient preservation of an input image. A method of providing gradient preservation of an input image, comprises the steps of: computing gradient fields of the input image; computing gradient fields of a remapped image, wherein the remapped image is the input image remapped; comparing a gradient of the remapped image to a predefined range of acceptable values, wherein the acceptable values depend on the input gradient; changing values of the gradient of the remapped image if the values of the gradient of the remapped image are not within the predefined range of acceptable values depending on the input gradient, resulting in x and y components of a modified gradient; and reconstructing the input image using the x and y components of the modified gradient.

REFERENCES:
patent: 5224208 (1993-06-01), Miller et al.
patent: 7430312 (2008-09-01), Gu
patent: 2004/0184667 (2004-09-01), Raskar et al.
patent: 2008/0199099 (2008-08-01), Michel et al.
Gradient Domain High Dynamic Range Compression, Fattal et al., 2001.

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