Improvement of accuracy in digital holography by use of multiple holograms

Baumbach, Torsten; Kolenović, Ervin; Kebbel, Volker; Jüptner, Werner

doi:10.1364/ao.45.006077

Cited by 87 publications

(58 citation statements)

References 11 publications

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“…Some of the useful properties discussed in the paper go in directions close to those pointed out by other authors (5), (16) .…”

Section: Discussionsupporting

confidence: 70%

Speckle Noise Reduction in Vibration Measurement by Time-Average Speckle Interferometry and Digital Holography-a Unifying Approach

BORZA

2008

JMMP

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Time-average electronic speckle pattern interferometry and digital holography are two representative full-field coherent optical techniques used in mechanical vibration measurement. In both techniques, the quantitative data processing is affected by several difficulties. The most important are the weak contrast of Bessel-type fringes and the speckle noise. The greatest obstacle in achieving complete amplitude field estimation comes from the orthogonal components of time-averaged digital holograms or speckle interferograms, where multiplicative, high-frequency phase noise covers the deterministic, vibration-related phase. Several researchers studied these problems in relation with the double-exposure method. In the present paper, the author presents in a single, unifying approach, these double-exposure methods, common to speckle interferometry and digital holography. An important reduction of multiplicative high-frequency phase noise allows obtaining fringe-averaged patterns whose intensity noise is much lower than in classical time-average holography. The analysis allows choosing the most appropriate method leading not only to a higher fringe pattern quality, lower noise and extended measurement range, but also to a method of vibration-related phase estimation, which may include in some stages subpixel precision. The method, based on the mathematical inversion of the Bessel function on monotonic intervals, is equivalent to phase unwrapping, but it only uses time-averaged fringe patterns.

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“…Some of the useful properties discussed in the paper go in directions close to those pointed out by other authors (5), (16) .…”

Section: Discussionsupporting

confidence: 70%

Speckle Noise Reduction in Vibration Measurement by Time-Average Speckle Interferometry and Digital Holography-a Unifying Approach

BORZA

2008

JMMP

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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%

“…In [35] the angle of incidence upon the object of the illuminating source is varied between captures and in [36] a random diffuser, placed just after the source illuminating the object, is moved between captures. In [37] the authors set out to improve a Fourier Digital holography metrology system. The unwrapped phase (showing deformation topology) is averaged for multiple captures where there is a slight change in the CCD position between captures.…”

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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“…This synthetic enlargement of the aperture, namely the hologram, is effective in reducing speckle size and then improving resolution. Other optical based techniques employ multiple hologram acquisitions as well [29][30][31][32][33][34][35], but there is no rearrangement of the holograms to produce a larger aperture. In these cases a superposition in an intensity basis of the individual reconstructions produces the final improvement in the holographic image.…”

Section: Introductionmentioning

confidence: 99%

Assessing digital micromirror devices for speckle noise control in digital holography

Gaviria-Mesa¹,

Hincapie²,

Garcı́a-Sucerquia³

et al. 2017

Opt. Pura Apl.

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ABSTRACT:Speckle noise is a common issue in coherent imaging techniques. As one of these techniques, digital holography (DH) is affected by this problem. Although several attempts have been made to overcome speckle noise in the numerical reconstruction of digitally recorded holograms, there still exists the need for fast and effective methods to get rid of speckle and improve image quality. We assess the suitability of a digital micromirror device (DMD) as modulator of the object illumination in a digital holographic setup, where the DMD acts generating speckle-like patterns that are projected onto the object. These patterns change the object beam in a random way. Several holograms, each with a different pattern in the object illumination, are recorded and numerically reconstructed. The image with reduced speckle noise is the result of a superposition in an intensity basis of various such reconstructions. The feasibility of the method is validated by experimental results.Key words: Digital holography; Speckle; Digital Micromirror Device RESUMEN:El ruido speckle es un problema inherente a las técnicas de formación de imágenes con luz coherente. Ya que la holografía digital es una de estas técnicas, también se ve afectada por este problema. Aunque se han hecho varios intentos por eliminar el ruido speckle en la reconstrucción numérica de hologramas registrados digitalmente, todavía existe la necesidad de métodos rápidos y efectivos para eliminar el speckle y mejorar la calidad de las imágenes reconstruidas. Nosotros evaluamos la conveniencia del uso de un dispositivo digital de microespejos (DMD) como modulador de la iluminación del objeto en un montaje holográfico digital. El DMD actúa generando patrones aleatorios tipo speckle que son proyectados sobre el objeto. Estos patrones cambian el haz objeto de una manera aleatoria y después interfiere formando el holograma. Se registran varios hologramas, cada uno con un patrón diferente en la iluminación del objeto, y se reconstruyen numéricamente. La imagen final con el ruido speckle reducido es el resultado de la superposición en intensidades de varias de estas reconstrucciones. La viabilidad del método es validada mediante resultados experimentales. [28] X. Cai and H. Wang, "The influence of hologram aperture on speckle noise in the reconstructed image of digital holography and its reduction", Opt. Commun. 281, 232-237 (2008).

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Improvement of accuracy in digital holography by use of multiple holograms

Cited by 87 publications

References 11 publications

Speckle Noise Reduction in Vibration Measurement by Time-Average Speckle Interferometry and Digital Holography-a Unifying Approach

Speckle Noise Reduction in Vibration Measurement by Time-Average Speckle Interferometry and Digital Holography-a Unifying Approach

Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays

Assessing digital micromirror devices for speckle noise control in digital holography

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