Image enhancement by nonlinear extrapolation in frequency space

  • Authors:
  • H. Greenspan;C. H. Anderson;S. Akber

  • Affiliations:
  • Fac. of Eng., Tel Aviv Univ.;-;-

  • Venue:
  • IEEE Transactions on Image Processing
  • Year:
  • 2000

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Abstract

A technique for enhancing the perceptual sharpness of an image is described. The enhancement algorithm augments the frequency content of the image using shape-invariant properties of edges across scale by using a nonlinearity that generates phase coherent higher harmonics. The procedure utilizes the Laplacian transform and the Laplacian pyramid image representation. Results are presented depicting the power-spectra augmentation and the visual enhancement of several images. Simplicity of computations and ease of implementation allow for real-time applications such as high-definition television (HDTV)