Abstract

We reply to the comment written by Ferrari and Ayubi on our recent paper, Kim et al. [Opt. Express, 20, 6737 (2012)]. We maintain that our use of Fourier filtering methods lead to valuable intrinsic contrast live cell imaging. Judging by their comments regarding the limit sin(x)~x, it seems that the authors overlooked Fig. 2 in our paper, where we show results with sinusoidal masks of different periods.

© 2013 OSA

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References

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  1. T. Kim, S. Sridharan, and G. Popescu, “Gradient field microscopy of unstained specimens,” Opt. Express20(6), 6737–6745 (2012).
    [CrossRef] [PubMed]
  2. S. K. Yao and S. H. Lee, “Spatial Differentiation and Integration by Coherent Optical-Correlation Method,” J. Opt. Soc. Am.61(4), 474–477 (1971).
    [CrossRef]
  3. J. K. T. Eu, C. Y. C. Liu, and A. W. Lohmann, “Spatial filters for differentiation,” Opt. Commun.9(2), 168–171 (1973).
    [CrossRef]
  4. T. Kim, S. Sridharan, A. Kajdacsy-Balla, K. Tangella, and G. Popescu, “Gradient field microscopy for label-free diagnosis of human biopsies,” Appl. Opt.52(1), A92–A96 (2013).
    [CrossRef] [PubMed]

2013

2012

1973

J. K. T. Eu, C. Y. C. Liu, and A. W. Lohmann, “Spatial filters for differentiation,” Opt. Commun.9(2), 168–171 (1973).
[CrossRef]

1971

Eu, J. K. T.

J. K. T. Eu, C. Y. C. Liu, and A. W. Lohmann, “Spatial filters for differentiation,” Opt. Commun.9(2), 168–171 (1973).
[CrossRef]

Kajdacsy-Balla, A.

Kim, T.

Lee, S. H.

Liu, C. Y. C.

J. K. T. Eu, C. Y. C. Liu, and A. W. Lohmann, “Spatial filters for differentiation,” Opt. Commun.9(2), 168–171 (1973).
[CrossRef]

Lohmann, A. W.

J. K. T. Eu, C. Y. C. Liu, and A. W. Lohmann, “Spatial filters for differentiation,” Opt. Commun.9(2), 168–171 (1973).
[CrossRef]

Popescu, G.

Sridharan, S.

Tangella, K.

Yao, S. K.

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