Chinese Journal of Magnetic Resonance ›› 2007, Vol. 24 ›› Issue (4): 462-468.

Previous Articles     Next Articles

An Image Enhancement Algorithm Combining Wavelet Domain and Image Domain Processing

XU Ling, LIU Wei,YANG Guang*   

  1. Shanghai Key Laboratory Functional Magnetic Resonance Imaging, Department of Physics, East China Normal University,Shanghai 200062, China
  • Received:2007-08-28 Online:2007-12-05 Published:2007-12-05
  • About author:*Corresponding author: Yang Guang,Tel:021-62233293,E-mail:gyang@phy.ecnu.edu.cn.
  • Supported by:

    上海市科委资助项目(06DZ22922), (06DZ22014).

Abstract:

A new image enhancement algorithm combining wavelet domain and image domain processing was proposed. Dual-tree complex wavelet transform (DTCWT) was used in the wavelet transform due to its good directional selectivity. To enhance the images, high frequency wavelet coefficients were firstly modified to enhance the local contrast and the details of image. The overall contrast of the image was then adjusted with non-linear transforms in the image domain. The algorithm allows automatic selection of processing parameters according to the characteristics of the raw images. Compared with results reported previously, images processed by this algorithm achieved better results both visually and statistically.

Key words: image enhancement, wavelet transform, dual-tree complex wavelet transform

CLC Number: