DocumentCode :
1527112
Title :
Efficient Operator for Local Energy Measurements to Enhance an Image Signal
Author :
Cvetkovic, Sascha ; Schirris, Johan ; de With, P.H.N.
Author_Institution :
Bosch Security Syst., Eindhoven, Netherlands
Volume :
5
Issue :
2
fYear :
2011
fDate :
4/1/2011 12:00:00 AM
Firstpage :
217
Lastpage :
229
Abstract :
For real-time imaging with digital video cameras and high-quality display with TV systems, the obtained picture quality including visibility of details, local contrast, and absence of artifacts, is very important to ensure user quality acceptance. We present a multi-window real-time high-frequency enhancement scheme, in which gain is a non-linear function of the detail energy. Then we discuss the computation of commonly used local energy measurements and show that a selection of those measurements can be calculated efficiently. In our first contribution, we propose a new local energy measurement APS that can be calculated more efficiently than the existing metrics in a 2-D-separable fashion. In addition, we also show that the new APS measurement gives better performance than standard energy measurements. The second contribution is the use of local contrast and a modified contrast gain formula that can substantially improve the overall algorithm performance, especially when a high-level contrast enhancement is desired. Our algorithm trades off between added contrast and “halo” artifacts, resulting in a good balance between visibility of details and an acceptable level of artifacts. The new scheme can be successfully applied to cameras and TV systems to improve their visual quality.
Keywords :
energy measurement; image enhancement; television displays; video cameras; APS measurement; TV systems; digital video cameras; high-quality display; image signal enhancement; local contrast; local energy measurements; modified contrast gain formula; multiwindow real-time high-frequency enhancement scheme; picture quality; real-time imaging; user quality acceptance; Local contrast enhancement; TV displays; local energy measurement; nonlinear sharpness enhancement;
fLanguage :
English
Journal_Title :
Selected Topics in Signal Processing, IEEE Journal of
Publisher :
ieee
ISSN :
1932-4553
Type :
jour
DOI :
10.1109/JSTSP.2010.2055831
Filename :
5498908
Link To Document :
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