Real-time and stroboscopic topography

Tanner, B. K.; Cringean, Janey K.

doi:10.1016/0146-3535(87)90024-4

Cited by 12 publications

(8 citation statements)

References 39 publications

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“…the number of levels which are distinguishable. It is always less than the maximum pixel value (14) and can be increased by summing videoframes (15). Noise artefacts are removed by filtering the images by means of Fourier transforms (14,17).…”

Section: Digitizing the Radiographmentioning

confidence: 99%

Digital image ratio: a new radiographic method for quantifying changes in alveolar bone. Part 1: theory and methodology

Jean

Epelboin

Rimsky

et al. 1996

J of Periodontal Research

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A new world, digital image ratio (DIR), has been developed for directly measuring changes in alveolar bone. The image on the computer monitor represents the relative mass change between two radiographs. Fourier filtering is used to reduce noise artefacts. This method is validated through an experiment with a step wedge. DIR needs only a preliminary calibration of the experimental conditions of operation and avoids tedious calibrations for each measurement as in the case of digital image substraction. Low-voltage X-ray techniques are suggested for long-term quantitative studies of patients to minimize irradiation doses.

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Section: Digitizing the Radiographmentioning

confidence: 99%

Digital image ratio: a new radiographic method for quantifying changes in alveolar bone. Part 1: theory and methodology

Jean

Epelboin

Rimsky

et al. 1996

J of Periodontal Research

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“…The resolution of the output image is 25 microns about. It is limited by the Xray converter (5), a fluorescent screen. The efficiency of such a converter ( ideally each incident X photon should be detected and converted in "visible" photons) is directly linked to the plate thickness and the size of the grain: larger the grain size, higher is the efficiency, but worse is the resolution.…”

Section: Topograph Digitisationmentioning

confidence: 99%

Use of image treatment for the understanding of the influence of crystal defects in piezoelectric materials

et al. 1994

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the propagation of surface or bulk acoustic waves in piezoelectric materials has been studied using the time structure of synchrotron X-ray beam. A precise state of vibration may be frozen in a stroboscopic topograph. The analysis of such images may be difficult since crystai defects induce highly contrasted areas which mask interesting details. Numerical image treatment give very efficient solutions to extract this "hidden" information. Fourier filtering is one of the methods and has been applied to the topographs, to study the interaction of the defects with the acoustic waves.

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“…Tanner & Cringean (1987) have shown the enhancement of a topograph by accumulating a number of frames. Fig.…”

Section: Digitization Of Experimental Imagesmentioning

confidence: 99%

Multiresolution Analysis for the Restoration of Noisy X-ray Topographs

Pilard

Epelboin²

1998

J Appl Cryst

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The principles of multiresolution analysis, which is based on wavelet theory, are reviewed, and it is shown that this technique is well adapted to the restoration of noisy images. In the analysis, a Gaussian white noise which propagates at all scales of the decomposition is assumed. In contrast to Fourier filtering, which is well localized in reciprocal space but not in direct space, multiresolution filtering allows one to suppress the noise without damaging the resolution. Using the example of an image recorded by a TV camera, it is shown that the technique allows one to obtain the same quality as when summing up to 64 frames. Multiresolution analysis may be used in all fields of science where images are damaged by a Gaussian noise.

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Real-time and stroboscopic topography

Cited by 12 publications

References 39 publications

Digital image ratio: a new radiographic method for quantifying changes in alveolar bone. Part 1: theory and methodology

Digital image ratio: a new radiographic method for quantifying changes in alveolar bone. Part 1: theory and methodology

Use of image treatment for the understanding of the influence of crystal defects in piezoelectric materials

Multiresolution Analysis for the Restoration of Noisy X-ray Topographs

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