A new preprint is available in IPOL: http://www.ipol.im/pub/pre/41/
Selective Contrast Adjustment by Poisson Equation
by Ana-Belen Petro and Catalina Sbert
Abstract
Poisson Image Editing is a new technique permitting to modify the
gradient vector field of an image, and then to recover an image with a
gradient approaching this modified gradient field. This amounts to solve
a Poisson equation, an operation which can be efficiently performed by
FFT. This paper describes an algorithm applying this technique, with two
different variants. The first variant enhances the contrast by
increasing the gradient in the dark regions of the image. This method is
well adapted to images with back light or strong shadows, and reveals
details in the shadows. The second variant of the same Poisson technique
enhances all small gradients in the image, thus also sometimes revealing
details and texture.
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IPOL - Image Processing On Line - http://ipol.im/
contact [email protected] - http://www.ipol.im/meta/contact/
news+feeds twitter @IPOL_journal - http://www.ipol.im/meta/feeds/
announces [email protected] - http://tools.ipol.im/mm/announce/
discussions [email protected] - http://tools.ipol.im/mm/discuss/
