Ultra-fine characteristics of a sharpened image rendered by decreasing the critical low-intermediate frequencies as well as increasing the critical higher frequencies

We develop a modified high-pass filtering approach by using a 5×5 mask. The traditional filtering-mask here is separated to two respective ones weighed by different constants. One of them consists of four coefficients in the vertical and horizontal directions, relating to the critical higher frequen...

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Bibliographic Details
Published inOptik (Stuttgart) Vol. 126; no. 23; pp. 3803 - 3806
Main Author Yang, Ching-Chung
Format Journal Article
LanguageEnglish
Published Elsevier GmbH 01.12.2015
Subjects
Image sharpening
Mask-filtering
Spatial frequency
Spatial frequency
Mask-filtering
Image sharpening
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ISSN0030-4026
1618-1336
DOI10.1016/j.ijleo.2015.08.210

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Summary:We develop a modified high-pass filtering approach by using a 5×5 mask. The traditional filtering-mask here is separated to two respective ones weighed by different constants. One of them consists of four coefficients in the vertical and horizontal directions, relating to the critical higher frequencies. The other is with eight coefficients in different directions, relating to the critical low-intermediate frequencies. The merit of this masking was disclosed by employing nonlinear transfer functions, which had been proved liable to reduce the overshooting phenomenon. The final image is subject to acquire ultra-fine characteristics.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2015.08.210