Stellar speckle image reconstruction by the shift-and-add method

Baba, Naoshi; Isobe, Syuzo; Norimoto, Yuji; Noguchi, Motokazu

doi:10.1364/ao.24.001403

Cited by 23 publications

(12 citation statements)

References 8 publications

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“…One effective method of noise reduction is to average successive video frames that are indistinguishable from each other except by the noise structure; this both increases the S/N ratio and leads to smoother images. In the present study, a composite of 210 video frames was used, and further image processing was carried out on this composite image using wavelet conversion 1,4) . RegiStax is a powerful program for stacking and aligning images either from stills or AVI frames.…”

Section: Discussionmentioning

confidence: 99%

Digital Video Image Processing from Dental Operating Microscope in Endodontic Treatment

Suehara

Nakagawa

Aida

et al. 2012

Bull. Tokyo Dent. Coll.

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Recently, optical microscopes have been used in endodontic treatment, as they offer advantages in terms of magnification, illumination, and documentation. Documentation is particularly important in presenting images to patients, and can take the form of both still images and motion video. Although high-quality still images can be obtained using a 35-mm film or CCD camera, the quality of still images produced by a video camera is significantly lower. The purpose of this study was to determine the potential of RegiStax in obtaining high-quality still images from a continuous video stream from an optical microscope. Video was captured continuously and sections with the highest luminosity chosen for frame alignment and stacking using the RegiStax program. The resulting stacked images were subjected to wavelet transformation. The results indicate that high-quality images with a large depth of field could be obtained using this method.

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Section: Discussionmentioning

confidence: 99%

Digital Video Image Processing from Dental Operating Microscope in Endodontic Treatment

Suehara

Nakagawa

Aida

et al. 2012

Bull. Tokyo Dent. Coll.

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“…The method of image stacking—also called “shift‐and‐add method”—was primarily used and developed by astronomers to gain high‐resolution images from a number of short exposure shots . The basic idea is to add a series of shift‐corrected noisy images to average out noise/atmospheric distortions and to increase the presence of real features in the images.…”

Section: Challenges and Approachesmentioning

confidence: 99%

Enhancements in full‐field PIXE imaging—Large area elemental mapping with increased lateral resolution devoid of optics artefacts

et al. 2018

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The combination of a pn‐junction charge‐coupled device‐based pixel detector with a poly‐capillary X‐ray optics was installed and examined at the Helmholtz‐Zentrum Dresden‐Rossendorf. The set‐up is intended for particle‐induced X‐ray emission imaging to survey the trace elemental composition of flat/polished geological samples. In the standard configuration, a straight X‐ray optics (20 μm capillary diameter) is used to guide the emitted photons from the sample towards the detector with nearly 70 000 pixels. Their dimensions of 48 × 48 μm2 are the main limitation of the lateral resolution. This limitation can be bypassed by applying a dedicated subpixel algorithm to recalculate the footprint of the photon's electron cloud in the detector. The lateral resolution is then mainly determined by the capillary's diameter. Nevertheless, images are still superimposed by the X‐ray optics pattern. The optics' capillaries are grouped in hexagonal bundles resulting in a reduced transmission of X‐rays in the boundary regions. This influence can be largely suppressed by combining a series of short measurements at slightly shifted positions using a precision stage and correcting the image data for this shifting. The use of a subpixel grid for the image reconstruction allows a further increase of the spatial resolution. This approach of image‐stacking and multiframe super‐resolution in combination with the subpixel correction algorithm is presented and illustrated with experimental data. Additionally, a flat‐field correction is shown to remove the remaining imaging inhomogeneity caused by non‐uniform X‐ray transmission. The described techniques can be used for all X‐ray spectrometry methods using an X‐ray camera to obtain high‐quality elemental images.

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“…The camera was operated at a high frame rate, so that the probability of having more than one event in any given frame is negligible. The frames with single event are select and the ‘shift and add’ algorithm is used to calculate the mean detector responses.…”

Section: Particle‐processing Detectorsmentioning

confidence: 99%

“… Mean detector response of one phosphor foil located (a) about 1 mm away from the image intensifier and (b) on the input surface of the image intensifier. The PSF is calculated from 250 alpha events with 'shift and add’ algorithm …”

Section: Particle‐processing Detectorsmentioning

confidence: 99%

Charged-particle emission tomography

2017

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PurposeConventional charged-particle imaging techniques —such as autoradiography —provide only two-dimensional (2D) black ex vivo images of thin tissue slices. In order to get volumetric information, images of multiple thin slices are stacked. This process is time consuming and prone to distortions, as registration of 2D images is required. We propose a direct three-dimensional (3D) autoradiography technique, which we call charged-particle emission tomography (CPET). This 3D imaging technique enables imaging of thick tissue sections, thus increasing laboratory throughput and eliminating distortions due to registration. CPET also has the potential to enable in vivo charged-particle imaging with a window chamber or an endoscope.MethodsOur approach to charged-particle emission tomography uses particle-processing detectors (PPDs) to estimate attributes of each detected particle. The attributes we estimate include location, direction of propagation, and/or the energy deposited in the detector. Estimated attributes are then fed into a reconstruction algorithm to reconstruct the 3D distribution of charged-particle-emitting radionuclides. Several setups to realize PPDs are designed. Reconstruction algorithms for CPET are developed.ResultsReconstruction results from simulated data showed that a PPD enables CPET if the PPD measures more attributes than just the position from each detected particle. Experiments showed that a two-foil charged-particle detector is able to measure the position and direction of incident alpha particles.ConclusionsWe proposed a new volumetric imaging technique for charged-particle-emitting radionuclides, which we have called charged-particle emission tomography (CPET). We also proposed a new class of charged-particle detectors, which we have called particle-processing detectors (PPDs). When a PPD is used to measure the direction and/or energy attributes along with the position attributes, CPET is feasible.

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Stellar speckle image reconstruction by the shift-and-add method

Cited by 23 publications

References 8 publications

Digital Video Image Processing from Dental Operating Microscope in Endodontic Treatment

Digital Video Image Processing from Dental Operating Microscope in Endodontic Treatment

Enhancements in full‐field PIXE imaging—Large area elemental mapping with increased lateral resolution devoid of optics artefacts

Charged-particle emission tomography

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