Title :
Power-Constrained Contrast Enhancement for Emissive Displays Based on Histogram Equalization
Author :
Lee, Chulwoo ; Lee, Chul ; Lee, Young-Yoon ; Kim, Chang-Su
Author_Institution :
Sch. of Electr. Eng., Korea Univ., Seoul, South Korea
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.
Keywords :
display instrumentation; image enhancement; convex optimization theory; emissive displays; histogram equalization; image contrast; log-based histogram modification scheme; perceptual quality; power-constrained contrast enhancement; video sequences; Helium; Histograms; Image processing; Organic light emitting diodes; Pixel; Power demand; Video sequences; Contrast enhancement; emissive displays; histogram equalization (HE); histogram modification (HM); image enhancement; low-power image processing; Algorithms; Computer Terminals; Data Display; Image Enhancement; Image Interpretation, Computer-Assisted; Numerical Analysis, Computer-Assisted; Reproducibility of Results; Sensitivity and Specificity; Signal Processing, Computer-Assisted;
Journal_Title :
Image Processing, IEEE Transactions on
DOI :
10.1109/TIP.2011.2159387