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IMAGE LOCAL CONTRAST ENHANCEMENT USING ADAPTIVE NON-LINEAR FILTERS Tarik Arici, Yucel Altunbasak
 

Summary: IMAGE LOCAL CONTRAST ENHANCEMENT USING ADAPTIVE NON-LINEAR FILTERS
Tarik Arici, Yucel Altunbasak
School of Electrical and Computer Engineering
Georgia Institute of Technology
Atlanta, GA 30332
E-mail: tariq, yucel@ece.gatech.edu
ABSTRACT
We present a locallY adaptivE Non-lInear (YENI) filter to ob-
tain the unsharp mask of an image. The unsharp mask obtained
by the YENI filter preserves the edges in the image while fil-
tering out the local details, which correspond to mid-range fre-
quencies in the spectrum. The enhanced image using this un-
sharp mask effectively prevents over/under (o/u) shooting arti-
facts often observed with other unsharp masking techniques.
The enhanced frequency range also spans lower frequencies
compared to the techniques that are based on Laplacian fil-
ter variants. This improves the visual quality of the image, as
measured subjectively and objectively in the real-video exper-
iments. Furthermore, since the YENI filter reduces to an IIR
filter at each pixel location, it has a low computational com-

  

Source: Altunbasak, Yucel - School of Electrical and Computer Engineering, Georgia Institute of Technology

 

Collections: Engineering