Topic
Speckle imaging
About: Speckle imaging is a research topic. Over the lifetime, 3730 publications have been published within this topic receiving 62354 citations.
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TL;DR: This work has applied the digital holographic optical coherence imaging technique for the depth-resolved imaging of rat osteogenic tumor multicellular spheroids and acquired cross-section images of the anterior segment and the retinal region of a mouse eye.
Abstract: Digital holographic optical coherence imaging is a full-frame coherence-gated imaging approach that uses a CCD camera to record and reconstruct digital holograms from living tissue. Recording digital holograms at the optical Fourier plane has advantages for diffuse targets compared with Fresnel off-axis digital holography. A digital hologram captured at the Fourier plane requires only a 2D fast Fourier transform for numerical reconstruction. We have applied this technique for the depth-resolved imaging of rat osteogenic tumor multicellular spheroids and acquired cross-section images of the anterior segment and the retinal region of a mouse eye. A penetration depth of 1.4 mm for the tumor spheroids was achieved.
68 citations
TL;DR: In this article, the influence of the speckle noise on the measured data quality is investigated, which is an unavoidable phenomenon occurring when a coherent light beam is scattered back from an optically rough surface.
68 citations
TL;DR: Digital holography generally offers more flexibility than conventional holographic interferometry and speckle interferometrics because of its simple setup and easy accessibility for 3D surfaces as discussed by the authors.
Abstract: Digital holography generally offers more flexibility than conventional holographic interferometry and speckle interferometry because of its simple setup and easy accessibility for 3D surfaces.
68 citations
TL;DR: Experimental results demonstrate that speckle noise is effectively avoided in severely distorted signals, thus improving the signal-to-noise ratio (SNR) significantly.
67 citations
TL;DR: In this article, a high-speed camera is used to acquire a number of frames of the image of the object motion sequentially, and the magnitude of the in-plane displacement of the motion is extracted.
Abstract: Measurement of in-plane displacements of a diffuse object by observing the temporal fluctuation of the speckle pattern in a dual-beam illumination speckle interferometer is illustrated. To conceive the temporal changes the object is displaced in its plane continuously. A high-speed camera is used to acquire a number of frames of the image of the object motion sequentially. Through Fourier transformation and inverse Fourier transformation of the frames stacked together, the total phase is determined. Finally, the magnitude of the in-plane displacement of the object motion is extracted. The range of displacement that can be measured using this novel method lies between few microns and over 100 μm on the upper end. Theory together with experimental results are presented in this paper.
67 citations