Incoherent recovering of the spatial resolution in digital holography

Garcı́a-Sucerquia, Jorge; Ramírez, Jorge; Castañeda, Román

doi:10.1016/j.optcom.2005.10.003

Cited by 36 publications

(32 citation statements)

References 20 publications

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“…Where noise reduction techniques have been reported in the literature, those routinely applied to the reconstructions of digital holograms of 3D objects are mean filtering, [21][22][23][24][25][26][27] Gaussian filtering, 28 median filtering, 11,26,27,29,30 subsampling, 29,31 and superposition of different reconstructions. 6,23 The DFF technique offers a number of significant advantages over its optical counterpart. First, no additional optical preprocessing or postprocessing is necessary in the capture of DHs.…”

Section: Resultsmentioning

confidence: 99%

“…In future work, we will look at creating more specialized filters (including complex valued ones) in an effort to improve on the results given here. The DFF technique also has an advantage over some existing DSP techniques, 6,7,23 in that it only requires a single DH. This implies that the method can be applied to all existing DHs captured previously.…”

Section: Resultsmentioning

confidence: 99%

“…There have been some recent contributions to the reduction of speckle in digital hologram (DH) reconstructions. 6,7 These methods use diffusers to partially reduce the coherence of the illumination and thus achieve a reduction in speckle. Another approach put forward for the removal of speckle was based on the maximum-likelihood technique and used a general model for image reflectivity.…”

Section: Introductionmentioning

confidence: 99%

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Reduction of speckle in digital holography by discrete Fourier filtering

et al. 2007

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We present a digital signal processing technique that reduces the speckle content in reconstructed digital holograms. The method is based on sequential sampling of the discrete Fourier transform of the reconstructed image field. Speckle reduction is achieved at the expense of a reduced intensity and resolution, but this tradeoff is shown to be greatly superior to that imposed by the traditional mean and median filtering techniques. In particular, we show that the speckle can be reduced by half with no loss of resolution (according to standard definitions of both metrics).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reduction of speckle in digital holography by discrete Fourier filtering

et al. 2007

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“…We note that the addition of the intensity of multiple hologram reconstructions has been previously demonstrated in the literature [33][34][35][36][37]. In [33] the illuminating source was rotated between captures in order to generate a series of reconstructions of the same static object with statistically independent speckle noise terms.…”

Section: A Multiple Capture Approach To Speckle Reductionmentioning

confidence: 99%

Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays

Kelly

Monaghan

Pandey

et al. 2010

International Journal of Digital Multimedia Broadcasting

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The application of digital holography as a viable solution to 3D capture and display technology is examined. A review of the current state of the field is presented in which some of the major challenges involved in a digital holographic solution are highlighted. These challenges include (i) the removal of the DC and conjugate image terms, which are features of the holographic recording process, (ii) the reduction of speckle noise, a characteristic of a coherent imaging process, (iii) increasing the angular range of perspective of digital holograms (iv) and replaying captured and/or processed digital holograms using spatial light modulators. Each of these challenges are examined theoretically and several solutions are put forward. Experimental results are presented that demonstrate the validity of the theoretical solutions.

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“…In order to create the spatially partially coherent source a rotating diffuser was placed in the path of the coherent light source. This technique was also used by Kim [16] in 2004 to reduce speckle in holographic 3D displays and by Sucerquia et al [17] two years later who introduced static (but different) diffusers during the recording of DHs and then added together the resulting reconstructions. Also in 2006, Baumbach et al [18] added together reconstructions from laterally shifted holograms of an object to reduce the speckle content.…”

Section: Introductionmentioning

confidence: 99%

Speckle reduction of reconstructions of digital holograms using three dimensional filtering

Maycock

McDonald

Hennelly

2013

Optics Communications

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We report on a new digital signal processing technique that reduces speckle in reconstructions of digital holograms. This is achieved by convolving the three dimensional intensity pattern (the intensity of the propagated DH at a series of different distances) with a 3D point spread function in all three dimensions (x,y,z ). It is based on the fact that the addition of different independent speckle images on an intensity basis reduces the speckle content. We provide quantitative results in terms of speckle index and resolution, and show that filtering in the z direction has the added benefit of an increase the depth of focus of the digital hologram reconstruction.

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Incoherent recovering of the spatial resolution in digital holography

Cited by 36 publications

References 20 publications

Reduction of speckle in digital holography by discrete Fourier filtering

Reduction of speckle in digital holography by discrete Fourier filtering

Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays

Speckle reduction of reconstructions of digital holograms using three dimensional filtering

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