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http://dx.doi.org/10.5909/JEB.2011.16.5.883

Bandpass Filter Based Focus Measure for Extended Depth of Field  

Cha, Su-Ram (Dept. of Electronics Engineering, Ewha Womans University)
Kim, Jeong-Tae (Dept. of Electronics Engineering, Ewha Womans University)
Publication Information
Journal of Broadcast Engineering / v.16, no.5, 2011 , pp. 883-893 More about this Journal
Abstract
In this paper, we propose a novel focus measure that determines in-focus and out-of-focus region in an image. In addition, we achieved extended depth of field by blending the acquired image and Wiener filtered image using a decision map based on the designed focus measure. Since conventional focus measures are based on the amount of high frequency components in an acquired image, the measures may not be accurate if there exist high frequency components in out-of-focused region. To overcome the problem, we designed the novel focus measure based on effective band pass filtering. In simulations and experiments, the proposed method showed better performance than existing methods.
Keywords
EDoF; DoF; Wiener filter; focus measure; decision map;
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1 J Huang, C. Huang, S. Phoong, and H. Chen, "Robust Measure of Image Focus in the Wavelet Domain," International Symposium on intelligent Signal Processing and Communication Systems, 2005.
2 R. C. Gonzalez, R. E. Woods, S. L. Eddins, Digital Image Processing Using MATLAB, Prentice-Hall, 2003.
3 M. Bertalmio, P. Fort and D. Sanchez-Crespo, " Real-time, Accurate Depth of Field using Anisotropic Diffusion and Programmable Graphics Card," 2nd International Symposium on 3D data Processing Visualization and Transmission, pp. 767-773, Sept, 2004
4 E. Dowski and W. Cathey, "Extended depth of field through wave-front coding," Optics, vol.4, no.11, pp.1859-1866, 1995.
5 G. Muyo and A. Harvey, "Wavefront coding for athermalization of infrared imaging systems," SPIE, vol.5612, pp.227-235, 2004.   DOI
6 E. Dowski and G. Johnson, "Wavefront Coding: A modern method of achieving high performance and/or low cost imaging systems," SPIE Annual Meeting, Denver, vol.29, pp.137-145, 1999.
7 C. L. Tisse, H. P. Nguyen, R. Tessieres, M. Pyanet and F. Guichard, "Extended depth-of-field (edof) using sharpness transport across colour channels," SPIE Conference vol.7061, Sept, 2008.
8 B. Forster, D. Van De Ville, J. Berent, D. Sage and M. Unser, "Complex Wavelets for Extended Depth-of-Field: A New Method for the Fusion of Multichannel Microscopy Images," Microscopy Research and Technique, vol.65, pp.33-42, 2004.   DOI   ScienceOn
9 R. J. Pieper and A. Korpel, "Image processing for extended depth of field," Optics, vol.22, no.10, pp.1449-1453, 1983.
10 N. T. Goldsmith, "Deep focus: a digital image processing technique to produce improved focal depth in light microscopy," Image Anal Stereol, vol.19, pp.163-167, 2000.   DOI
11 P. J. Burt and R. J. Kolczynski, "Enhanced image capture through fusion." 4th International Conference on IEEE Computer Vision, pp.173-182, 1993   DOI
12 V. Maik, D. Cho, J. Shin and J. Paik, "Regularized Restoration Using Image Fusion for Digital Auto-Focusing," IEEE Transactions Circuits System and Video Technology, vol.17, no.10, pp.1360-1369, Oct, 2007.   DOI   ScienceOn
13 S. Li and B. Yang, "Multifocus image fusion using region segmentation and spatial frequency," Image and Vision Computing, vol.26, no.7, pp.971-979, 2008.   DOI   ScienceOn
14 S. Kuthirummal and K. Nayar, "Shape from focus," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.16, pp.824-831, 1994.   DOI   ScienceOn
15 K. S. Choi, J. S Lee and S. J Ko, "New Autofocusing Technique Using the Frequency Selective Weighted Median Filter for Video Cameras," IEEE Transactions on Consumer Electronics, vol.45, no.3, pp.820-827, Aug, 1999.   DOI   ScienceOn
16 S. Kim, S. Jum, E. Lee, J. Shin and J. Paik, "Real-time Bayer-Domain Image Restoration for an Extended Depth of Field (EDoF) Camera, IEEE Transactions on Consumer Electronics, vol.55, no.4, Nov, 2009.   DOI   ScienceOn
17 M. Kristan, J. Pers, M. Perse and Sk. Kovacic, "A Bayes-spectral-entropy- based measure of camera focus using a discrete cosine transform," Pattern Recognition Letters, vol.27, no.13, pp1431-1439, Oct, 2006.   DOI   ScienceOn
18 P. Cao, M. Xing, G. Sun, Y. Li, and Z. Bao; , "Minimum Entropy via Subspace for ISAR Autofocus," IEEE Geoscience and Remote Sensing Letters, vol.7, no.1, pp.205-209, Jan. 2010.   DOI   ScienceOn