Universal spatial up-scaler with nonlinear edge enhancement

Author

Schiemenz, Stefan ; Hentschel, Christian

Author_Institution

Brandenburg Univ. of Technol., Cottbus, Germany

fYear

2007

fDate

3-7 Sept. 2007

Firstpage

140

Lastpage

144

Abstract

Spatial image resizing is an important issue for pixel oriented displays with variable input formats. A known example is a scaling factor of two for up-scaling from Standard Definition (SD) to High Definition (HD) format. Nonlinear image processing introduce higher harmonics to enhance the image sharpness. However it may create annoying alias artefacts, too. We investigated an up-scaler for rational factors with nonlinear detail enhancement. The method for scaling is based on economic diamond shaped filters. The additional available frequency space is filled with higher harmonic frequencies created from the detail signal by an improved approach for nonlinear signal processing. The bandwidth of higher harmonics is limited to the output Nyquist frequency in order to prevent aliasing.

Keywords

edge detection; filtering theory; image enhancement; image resolution; economic diamond shaped filters; harmonic frequencies; high definition format; image sharpness enhancement; nonlinear detail enhancement; nonlinear edge enhancement; nonlinear image processing; nonlinear signal processing; output Nyquist frequency; pixel oriented displays; scaling factor; spatial image resizing; standard definition format; universal spatial up-scaler; variable input formats; detail enhancement; diamond scaler; edge enhancement; image scaling; nonlinear processing;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Conference, 2007 15th European

Conference_Location

Poznan

Print_ISBN

978-839-2134-04-6

Type

conf

Filename

7098780