A power-constrained contrast enhancement algorithm for emissive displays based on histogram equalization is proposed in this work. We first propose a log-based histogram modification scheme to reduce overstretching artifacts of the conventional histogram equalization technique. Then, we develop a power consumption model for emissive displays, and formulate an objective function that consists of the histogram equalizing term and the power term. By minimizing the objective function based on the convex optimization theory, the proposed algorithm achieves contrast enhancement and power saving simultaneously. Moreover, we extend the proposed algorithm to enhance video sequences as well as still images. Simulation results demonstrate that the proposed algorithm can reduce power consumption significantly, while improving image contrast and perceptual quality.
Chulwoo Lee, Chul Lee, Chang-Su Kim, “Power-constrained contrast enhancement for OLED displays based on histogram equalization,” in Proc. Internation Conference on Image Processing (ICIP), Hong Kong, pp. 1689-1692, Sep. 2010. [doi] [pdf] [pptx]
Chulwoo Lee, Chul Lee, Young-Yoon Lee, Chang-Su Kim, “Power-constrained contrast enhancement for emissive displays based on histogram equalization,” IEEE Transactions on Image Processing, vol. 21, pp. 80-93, Jan. 2012. [doi] [pdf]