[IPOL announce] new article: Selective Contrast Adjustment by Poisson Equation

[announcements about the IPOL journal]

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.