Using adaptive tone mapping to enhance edge-preserving color image automatically

  • Authors:

  • Kuo-Jui Hu;Min-Yao Lu;Je-Chuang Wang;Tao-I Hsu;Ting-Ting Chang

  • Affiliations:

  • Chung-Cheng Institute of Technology, National Defense University, Taoyuan County, Taiwan;Display Technology Center, Industrial Technology Research Institute, Hsinchu, Taiwan;Chung-Cheng Institute of Technology, National Defense University, Taoyuan County, Taiwan;3Department of Digital Multimedia Arts, Shih Hsin University, Taipei, Taiwan;Display Technology Center, Industrial Technology Research Institute, Hsinchu, Taiwan

  • Venue:
  • Journal on Image and Video Processing - Special issue on emerging methods for color image and video quality enhancement
  • Year:
  • 2010

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Abstract

One common characteristic of most high-contrast images is the coexistence of dark shadows and bright light source in one scene. It is very difficult to present details in both dark and bright areas simultaneously on most display devices. In order to resolve this problem, a new method utilizing bilateral filter combined with adaptive tone-mapping method is proposed to improve image quality. First of all, bilateral filter is used to decompose image into two layers: large-scale layer and detail layer. Then, the largescale layer image is divided into three regions: bright, mid-tone, and dark region. Finally, an appropriate tone-mapping method is chosen to process each region according to its individual property. Only large-scale layer image is enhanced by using adaptive tone mapping; therefore, the details of the original image can be preserved. The experiment results demonstrate the success of proposed method. Furthermore, the proposed method can also avoid posterization produced by methods using histogram equalization.