A novel FPGA implementation of adaptive color image enhancement based on HSV color space

Abstract

In this paper, a new algorithm and a novel architecture suitable for Field Programmable Gate Array (FPGA) implementation of adaptive color image enhancement based on Hue-Saturation-Value (HSV) color space is presented. The contrast and luminance of the color image is enhanced by using saturation feedback. The saturation component is enhanced by stretching its dynamic range to get rich color display. Hue is preserved in order to avoid color distortion. The adaptive luminance enhancement is achieved by using a simple geometric mean filter since traditional arithmetic mean filter tends to lose image detail such as edges and sharpness when compared to geometric mean filter. An efficient architecture for histogram equalization is also developed in order to evaluate the performance of proposed algorithm. The algorithm is implemented on Xilinx Vertex II XC2V2000–4ff896 FPGA device. The pipelining and parallel processing techniques have been adapted in order to speed up the enhancement process. The experimental results show that the color images enhanced by the proposed algorithm are clearer, vivid and efficient.