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3D Research

, 9:50 | Cite as

Contrast Enhancement Technique Based on Lifting Wavelet Transform

  • Megha Goyal
  • Bharat Bhushan
  • Shailender Gupta
  • Rashmi Chawla
3DR Express
  • 39 Downloads
Part of the following topical collections:
  1. Image Processing

Abstract

Contrast enhancement is an indispensable process for improving the subjective quality and information content of an image. Adjustment in the relative brightness and darkness of an image is done in order to attain the same. This paper employs lifting wavelet transform (LWT) to enhance the image since it is computationally inexpensive. The application of LWT results in the low and high frequency components. The former components that contain most of the information are enhanced using CLAHE algorithm while the latter are kept unchanged. In addition, a weighted average matrix which controls the level of enhancement is used to acquire the enhanced output image. To measure the efficacy, the proposed technique is implemented in MATLAB-2013 and evaluated on the basis of several performance metrics such as: absolute mean brightness error, average information content, Contrast Improvement Index, degree of entropy unpreserved, Structural Similarity Index, Universal Quality Index. From experiment, it can be observed that the results obtained from proposed algorithm are better than or comparable to other popular techniques in literature in almost all the parameters undertaken.

Keywords

CLAHE Histogram equalization Wavelet 

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Copyright information

© 3D Research Center, Kwangwoon University and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Megha Goyal
    • 1
  • Bharat Bhushan
    • 1
  • Shailender Gupta
    • 1
  • Rashmi Chawla
    • 1
  1. 1.Electronics and Communication DepartmentYMCA University of Science and TechnologyFaridabadIndia

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