Contrast enhancement based on layered difference representation

Chulwoo Lee, Chul Lee, Chang-Su Kim
2012 2012 19th IEEE International Conference on Image Processing  
A novel contrast enhancement algorithm based on the layered difference representation is proposed in this work. We first represent graylevel differences at multiple layers in a tree-like structure. Then, based on the observation that gray-level differences, occurring more frequently in the input image, should be more emphasized in the output image, we solve a constrained optimization problem to derive the transformation function at each layer. Finally, we aggregate the transformation functions
more » ... ormation functions at all layers into the overall transformation function. Simulation results demonstrate that the proposed algorithm enhances images efficiently in terms of both objective quality and subjective quality. Index Terms-Contrast enhancement, layered difference representation, histogram equalization, and constrained optimization.
doi:10.1109/icip.2012.6467022 dblp:conf/icip/LeeLK12 fatcat:zfzv47tlcjb7haxbfrawvnrzm4