Contrast enhancement using multiple mapping functions for power reduction in OLED display

Abstract

This paper proposes the power constrained contrast enhancement algorithm for OLED display based on the multi-mapping functions for improving the local contrast of the input image. The proposed method divides the input image into several blocks. Then, it calculates the multi-mapping functions corresponding to each block using convex optimization process between the image quality and power consumption. Using the multi-mapping function, the proposed method adjusts the mapping function and calculates the output image using the bilinear interpolation. In the experimental results, the proposed method improved the local contrast, and increased the enhancement performance measure and sharpness by up to 57.8% and 41.9% compared to benchmark methods.