A Differentiable Approximation Approach to Contrast-Aware Image Fusion

作者：Hara Kenji^*; Inoue Kohei; Urahama Kiichi

来源：IEEE Signal Processing Letters, 2014, 21(6): 742-745.

DOI：10.1109/LSP.2014.2314647

• Differentiable approximation
• image fusion
• log-sum-exp

We propose a new weight optimization method for image fusion to obtain enhanced images. Given as input a set of images of a static scene captured under different photographic conditions such as exposure time and depth of focus, the algorithm modifies the input images based on visual saliency and then searches for a linear combination of the images that maximizes the total amount of gradient magnitudes. The search is performed by approximating a non-differentiable Lagrangian with the log-sum-exp function and then iteratively updating the closed-form analytical solution until convergence. The simple algorithm has converged fast and has demonstrated significant improvement in image quality over several conventional techniques.

• 出版日期2014-6