[IPOL announce] new article: Selective Contrast Adjustment by Poisson Equation
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Thu Sep 26 10:59:41 CEST 2013
A new article is available in IPOL: http://www.ipol.im/pub/art/2013/41/
Selective Contrast Adjustment by Poisson Equation
by Ana-Belen Petro, Catalina Sbert
Image Processing On Line, vol. 2013, pp. 198–212.
http://www.ipol.im/pub/art/2013/41/
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
Fast Fourier Transform (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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