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Multiscale Contrast Enhancement for Compressed Digital Images with Block Artifacts Consideration

  • Kashif Iqbal
  • Asmatullah Chaudhry
  • Asifullah Khan
  • Ajmal Bangash
Conference paper

Keywords

A simple and efficient algorithm is presented for contrast enhancement, of JPEG compressed images, in the Discrete Cosine Transform (DCT) domain. The algorithm enhances the DCT coefficients in accordance with their band importance. Since uniformly modifying all the frequency bands causes block artifacts, therefore, the low frequency bands are dealt with differently than the rest of the frequency bands. As the enhancement is done in the decompression stage, compressibility of the original image is not affected. Subjective and objective tests performed on various images validate the concept of multiscale contrast enhancement.

Keywords

Contrast Enhancement Digital Image Enhancement Discrete Cosine Transform (DCT) and JPEG Compression. 

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References

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Copyright information

© Springer 2007

Authors and Affiliations

  • Kashif Iqbal
    • 1
  • Asmatullah Chaudhry
    • 1
  • Asifullah Khan
    • 2
  • Ajmal Bangash
    • 1
  1. 1.Faculty of Computer Science Engineering,Ghulam Ishaq Khan (GIK) Institute of Engineering Science TechnologySwabiPakistan
  2. 2.Department of Computer and Information Sciences, Pakistan Institute of Engineering and Applied SciencesNilorePakistan

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