Issues About Retinex Theory and Contrast Enhancement
International Journal of Computer Vision
Image Fusion for Enhanced Visualization: A Variational Approach
International Journal of Computer Vision
A PDE formalization of retinex theory
IEEE Transactions on Image Processing
A Total Variation Model for Retinex
SIAM Journal on Imaging Sciences
A Wavelet Perspective on Variational Perceptually-Inspired Color Enhancement
International Journal of Computer Vision
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In this paper, we present a discussion about perceptual-based color correction of digital images in the framework of variational techniques. We propose a novel image functional whose minimization produces a perceptually inspired color enhanced version of the original. The variational formulation permits a more flexible local control of contrast adjustment and attachment to data. We show that a numerical implementation of the gradient descent technique applied to this energy functional coincides with the equation of automatic color enhancement (ACE), a particular perceptual-based model of color enhancement. Moreover, we prove that a numerical approximation of the Euler-Lagrange equation reduces the computational complexity of ACE from O(N2) to O(NlogN), where N is the total number of pixels in the image