A Novel Approach for Color Image Enhancement Using Double Window Concept

Abstract

In this paper, a new approach for the enhancement of color image using luminance and contrast enhancement based on double window concept has been presented. The proposed method exploits Hue-Saturation-Value (HSV) color space since the HSV space separates color from intensity. The hue and saturation components have been kept constant in order to avoid color distortion. In this work, the value component of the HSV has been modified in two steps. First, the non-linear transfer function is applied on the overlapping and non-overlapping window in order to enhance luminance part of the image. Further, the 2-D Gaussian filter has been used for contrast enhancement. The Gaussian filter enhances the darker pixel while neutralizing the over enhanced pixel. The modified value is combined with preserved hue and saturation components in order to obtain enhanced HSV image. Finally, the image from HSV color space is converted into RGB color space. The experimental results presented show that the color image enhanced by this algorithm is clearer, vivid and efficient.