Remember Me
Or use your Academic/Social account:


Or use your Academic/Social account:


You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.


Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message


Verify Password:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Zammit, Paul; Harvey, Andrew R.; Carles Santacana, Guillem (2014)
Publisher: Optical Society of America
Languages: English
Types: Article

Classified by OpenAIRE into

arxiv: Computer Science::Computer Vision and Pattern Recognition
Traditional approaches to imaging require that an increase in depth of field is associated with a reduction in\ud numerical aperture, and hence with a reduction in resolution and optical throughput. In their seminal\ud work, Dowski and Cathey reported how the asymmetric point-spread function generated by a cubic-phase\ud aberration encodes the detected image such that digital recovery can yield images with an extended depth of\ud field without sacrificing resolution [Appl. Opt. 34, 1859 (1995)]. Unfortunately recovered images are\ud generally visibly degraded by artifacts arising from subtle variations in point-spread functions with defocus.\ud We report a technique that involves determination of the spatially variant translation of image components\ud that accompanies defocus to enable determination of spatially variant defocus. This in turn enables recovery\ud of artifact-free, extended depth-of-field images together with a two-dimensional defocus and range map\ud of the imaged scene. We demonstrate the technique for high-quality macroscopic and microscopic imaging\ud of scenes presenting an extended defocus of up to two waves, and for generation of defocus maps with an\ud uncertainty of 0.036 waves.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • 1. G. Hausler, “A method to increase the depth of focus by two step image processing,” Opt. Commun. 6, 38-42 (1972).
    • 2. J. Edward, R. Dowski, and W. T. Cathey, “Extended depth of field through wave-front coding,” Appl. Opt. 34, 1859-1866 (1995).
    • 3. S. Bradburn, W. T. Cathey, and E. R. Dowski, “Realizations of focus invariance in optical-digital systems with wave-front coding,” Appl. Opt. 36, 9157-9166 (1997).
    • 4. S. Prasad, T. C. Torgersen, V. P. Pauca, R. J. Plemmons, and J. van der Gracht, “Engineering the pupil phase to improve image quality,” Proc. SPIE 5108, 1-12 (2003).
    • 5. M. Demenikov, E. Findlay, and A. R. Harvey, “Miniaturization of zoom lenses with a single moving element,” Opt. Express 17, 6118-6127 (2009).
    • 6. G. Muyo, A. Singh, M. Andersson, D. Huckridge, A. Wood, and A. R. Harvey, “Infrared imaging with a wavefront-coded singlet lens,” Opt. Express 17, 21118-21123 (2009).
    • 7. G. Muyo and A. R. Harvey, “Decomposition of the optical transfer function: wavefront coding imaging systems,” Opt. Lett. 30, 2715-2717 (2005).
    • 8. M. Somayaji, V. R. Bhakta, and M. P. Christensen, “Experimental evidence of the theoretical spatial frequency response of cubic phase mask wavefront coding imaging systems,” Opt. Express 20, 1878-1895 (2012).
    • 9. M. Demenikov and A. R. Harvey, “Image artifacts in hybrid imaging systems with a cubic phase mask,” Opt. Express 18, 8207-8212 (2010).
    • 10. M. Demenikov and A. R. Harvey, “Parametric blind-deconvolution algorithm to remove image artifacts in hybrid imaging systems,” Opt. Express 18, 18035-18040 (2010).
    • 11. X. Mo and J. Wang, “Phase transfer function based method to alleviate image artifacts in wavefront coding imaging system,” Proc. SPIE 8907, 89074H (2013).
    • 12. R. N. Zahreddine, R. H. Cormack, and C. J. Cogswell, “Noise removal in extended depth of field microscope images through nonlinear signal processing,” Appl. Opt. 52, D1-D11 (2013).
    • 13. S. Mezouari and A. R. Harvey, “Phase pupil functions for reduction of defocus and spherical aberrations,” Opt. Lett. 28, 771-773 (2003).
    • 14. N. George and W. Chi, “Extended depth of field using a logarithmic asphere,” J. Opt. A 5, S157-S163 (2003).
    • 15. T. Vettenburg, N. Bustin, and A. R. Harvey, “Fidelity optimization for aberration-tolerant hybrid imaging systems,” Opt. Express 18, 9220-9228 (2010).
    • 16. P. Favaro and S. Soatto, “A geometric approach to shape from defocus,” IEEE Trans. Pattern Anal. Mach. Intell. 27, 406-417 (2005).
    • 17. S. Quirin and R. Piestun, “Depth estimation and image recovery using broadband, incoherent illumination with engineered point spread,” Appl. Opt. 52, A367-A376 (2013).
    • 18. P. M. Blanchard and A. H. Greenaway, “Simultaneous multiplane imaging with a distorted diffraction grating,” Appl. Opt. 38, 6692-6699 (1999).
    • 19. A. K. Prasad, “Stereoscopic particle image velocimetry,” Exp. Fluids 29, 103-116 (2000).
    • 20. F. Pereira and M. Gharib, “Defocusing digital particle image velocimetry and the three-dimensional characterization of two-phase flows,” Meas. Sci. Technol. 13, 683-694 (2002).
    • 21. B. Huang, W. Wang, M. Bates, and X. Zhuang, “Three-dimensional super-resolution imaging by stochastic optical reconstruction microscopy,” Science 319, 810-813 (2008).
    • 22. J. He, X. Zhuang, S. A. Jones, and S.-H. Shim, “Fast, threedimensional super-resolution imaging of live cells,” Nat. Methods 8, 499-505 (2011).
    • 23. G. Carles, “Analysis of the cubic-phase wavefront-coding function: physical insight and selection of optimal coding strength,” Opt. Lasers Eng. 50, 1377-1382 (2012).
    • 24. Y. Feng, P. A. Dalgarno, D. Lee, Y. Yang, R. R. Thomson, and A. H. Greenaway, “Chromatically-corrected, high-efficiency, multicolour, multi-plane 3D imaging,” Opt. Express 20, 20705-20714 (2012).
    • 25. G. Carles, G. Muyo, S. Bosch, and A. Harvey, “Use of a spatial light modulator as an adaptable phase mask for wavefront coding,” J. Mod. Opt. 57, 893-900 (2010).
    • 26. B. Das, S. Vyas, J. Joseph, P. Senthilkumaran, and K. Singh, “Transmission type twisted nematic liquid crystal display for three gray-level phase-modulated holographic data storage systems,” Opt. Lasers Eng. 47, 1150-1159 (2009).
  • No related research data.
  • No similar publications.

Share - Bookmark

Cite this article