Title :
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
fDate :
6/1/2000 12:00:00 AM
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;
Journal_Title :
Image Processing, IEEE Transactions on
