LAUSR

Decolorization is a fundamental technology indispensable for image processing, digital printing, and photograph rendering, while it suffers from information loss. This paper presents a novel parametric ratio-based method for efficient contrast-preserving decolorization (PrDecolor). For better preserving the details, features and visual distinctiveness of original color contrast, the proposed method simplifies and improves the current ratio-based decolorization model by incorporating the multivariate parametrical constraint. Moreover, the newly defined model is solved by efficient augmented Lagrangian and alternating direction method. The presented algorithm exhibits excellent iterative convergence and robustness with respect to the parameters. Extensive experiments under a variety of test images and a comprehensive evaluation against existing state-of-the-art methods consistently demonstrate the potential of the proposed algorithm.