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Adaptive contrast enhancement based on highly overlapped interpolation

[+] Author Affiliations
Zhi Q. Wu

University of Glamorgan, School of Computing, Pontypridd, Wales, United Kingdom CF37 1DL

J. Andrew Ware

University of Glamorgan, School of Computing, Pontypridd, Wales, United Kingdom CF37 1DL

Jianmin Jiang

University of Bradford, School of Informatics, Bradford, United Kingdom BD7 1DP

J. Electron. Imaging. 14(3), 033006 (July 15, 2005). doi:10.1117/1.1993624
History: Received May 22, 2003; Revised May 15, 2004; Accepted December 06, 2004; Published July 15, 2005; Online July 15, 2005
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Conventional pointwise adaptive contrast enhancement is very effective in adjusting the contrast of medical images with large regional brightness differences. However, the pointwise algorithm is computationally intensive, thus limiting its practical application. Two existing stepwise algorithms cut down the computational overhead by adopting regional interpolation and averaging techniques respectively. Based on these two stepwise algorithms, we describe an adaptive contrast enhancement in which a new kind of variable image filter suitable for array multiplication is employed. Experiments show that the new algorithm can avoid the generation of blocking effects and effectively reduce image distortion in enhancement. Moreover, the speed of the algorithm can be adjusted according to different requirements.

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© 2005 SPIE and IS&T

Citation

Zhi Q. Wu ; J. Andrew Ware and Jianmin Jiang
"Adaptive contrast enhancement based on highly overlapped interpolation", J. Electron. Imaging. 14(3), 033006 (July 15, 2005). ; http://dx.doi.org/10.1117/1.1993624


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