نتایج جستجو برای: image scanner
تعداد نتایج: 390548 فیلتر نتایج به سال:
The lack of a scanner calibration target representative of the image medium (substrate and colorants) often limits the accuracy of scanner color calibration. In this paper, a color calibration method is presented for photographic input media that does not require a calibration target. Using characteristic spectral measurements from the image(s) to be scanned, a model for the spectra on the medi...
PURPOSE The image noise and image quality of a prototype ultra-high-resolution computed tomography (U-HRCT) scanner was evaluated and compared with those of conventional high-resolution CT (C-HRCT) scanners. MATERIALS AND METHODS This study was approved by the institutional review board. A U-HRCT scanner prototype with 0.25 mm x 4 rows and operating at 120 mAs was used. The C-HRCT images were...
A robust watermarking algorithm for the 3D mesh models is proposed. The algorithm is based on the watermarking of images from a virtual 3D scanner which mimics the operation of 3D scanner in the real world. The position of the object in the scanner is determined by the principle component analysis of the vertex points. After obtaining 2D range image from the virtual scanner, we embed the waterm...
The main thrust for this work is the investigation and design of a whole-body PET scanner based on new lanthanum bromide scintillators. We use Monte Carlo simulations to generate data for a 3D PET scanner based on LaBr3 detectors, and to assess the count-rate capability and the reconstructed image quality of phantoms with hot and cold spheres using contrast and noise parameters. Previously we h...
Introduction: Noise and spatial resolution (SR) are the main characteristics of image quality in CT scanning affected by different radiation and technical parameters. One of the important parameters are reconstruction kernels. Different reconstruction kernels are used for noise reduction and/or edge-enhancement purposes. In this study, we investigate some reconstruction kern...
A confocal scanner for selective observation of the vertical particle tracks in the nuclear photoemulsion is described. The particle track being searched for is imaging at an angle of 45◦ with respect to the optical axis of the system. The confocal scanner is provided with a new optical element, an ®image orthogonalizator ̄, by means of which the extended image of the inclined vertical particle ...
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