Image enhancement by nonlinear extrapolation in frequency space

Author

Greenspan, Hayit ; Anderson, Charles H. ; Akber, Sofia

Author_Institution

Fac. of Eng., Tel Aviv Univ., Israel

Volume

9

Issue

6

fYear

2000

fDate

6/1/2000 12:00:00 AM

Firstpage

1035

Lastpage

1048

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)

Keywords

Laplace transforms; extrapolation; high definition television; image enhancement; image representation; spectral analysis; video signal processing; HDTV; Laplacian pyramid image representation; Laplacian transform; frequency space; high-definition television; image enhancement; nonlinear extrapolation; nonlinearity; perceptual sharpness; phase coherent higher harmonics; power-spectra augmentation; real-time applications; shape-invariant properties; visual enhancement; Biomedical engineering; Degradation; Extrapolation; Frequency; HDTV; Image enhancement; Image representation; Image resolution; Laplace equations; Spatial resolution;

fLanguage

English

Journal_Title

Image Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7149

Type

jour

DOI

10.1109/83.846246

Filename

846246