title: Power-constrained contrast enhancement for emissive displays based on histogram equalization.
abstract: A power-constrained contrast-enhancement algorithm for emissive displays based on histogram equalization (HE) is proposed in this paper. We first propose a log-based histogram modification scheme to reduce overstretching artifacts of the conventional HE 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.
authors.affiliation: School of Electrical Engineering, Korea University, Seoul, Korea. wiserain@korea.ac.kr
authors.forename: Chulwoo
authors.initials: C
authors.lastname: Lee
authors.forename: Chul
authors.initials: C
authors.lastname: Lee
authors.forename: Young-Yoon
authors.initials: YY
authors.lastname: Lee
authors.forename: Chang-Su
authors.initials: CS
authors.lastname: Kim
mesh_terms: D000465:Algorithms; D016288:Computer Terminals; D003626:Data Display; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009716:Numerical Analysis, Computer-Assisted; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted