Image enhancement by nonlinear extrapolation in frequency space

Hayit Greenspan, Charles H. Anderson, Sofia Akber

Research output: Contribution to journalArticlepeer-review

160 Scopus citations


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 east of implementation allow for real-time applications such as high-definition television (HDTV).

Original languageEnglish
Pages (from-to)1035-1048
Number of pages14
JournalIEEE Transactions on Image Processing
Issue number6
StatePublished - 2000


FundersFunder number
National Aeronautics and Space Administration
Intel Corporation


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