Focus measure based on the energy of high-frequency components in the S transform
Optics Letters, Vol. 35, Issue 8, pp. 1272-1274 (2010)
http://dx.doi.org/10.1364/OL.35.001272
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Abstract
Focus measure plays a fundamental role in the shape from focus technique. In this Letter, we suggest a focus measure in the S-transform domain that is based on the energy of high-frequency components. A localized spectrum by using variable window size provides a more accurate method of measuring image sharpness as compared to other focus measures proposed in spectral domains. An optimal focus measure is obtained by selecting an appropriate frequency-dependent window width. The performance of the proposed focus measure is compared with those of existing focus measures in terms of three-dimensional shape recovery. Experimental results demonstrate the effectiveness of the proposed focus measure.
© 2010 Optical Society of America
OCIS Codes
(100.3020) Image processing : Image reconstruction-restoration
(100.6890) Image processing : Three-dimensional image processing
(100.4994) Image processing : Pattern recognition, image transforms
ToC Category:
Image Processing
History
Original Manuscript: December 4, 2009
Manuscript Accepted: February 26, 2010
Published: April 15, 2010
Citation
Muhammad Tariq Mahmood and Tae-Sun Choi, "Focus measure based on the energy of high-frequency components in the S transform," Opt. Lett. 35, 1272-1274 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-8-1272
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