نتایج جستجو برای: ray images
تعداد نتایج: 543515 فیلتر نتایج به سال:
There is a pressing need for the archiving and curation of raw X-ray diffraction data. This information is critical for validation, methods development and improvement of archived structures. However, the relatively large size of these data sets has presented challenges for storage in a single worldwide repository such as the Protein Data Bank archive. This problem can be avoided by using a fed...
Image representation is one of the major aspects of automatic classification algorithms. In this paper, different feature extraction techniques have been utilized to represent medical X-ray images. They are categorized into two groups; (i) low-level image representation such as Gray Level Co-occurrence Matrix(GLCM), Canny Edge Operator, Local Binary Pattern(LBP) , pixel value, and (ii) local pa...
This paper presents an approach for mining 2D shape of human lungs from large x-ray image archives of a national level. Images were accumulated in framework of a compulsory computerized country-wide screening programme launched few years ago which is being under development. Three study groups of images containing about 21, 18 and 39 thousand of subjects were created by sub-sampling from a test...
In this paper we will describe our experiments with x-ray image analysis for vertebra detection in juvenile/adolescent patients with idiopathic scoliotic spines. We will focus on detecting vertebrae location in a anterior-posterior x-ray image in a fully automatic way. For accomplishing this, we propose a set of techniques for (i) isolating the spine by removing other bone structures (e.g. ribs...
We consider the X-ray emission due to bremsstrahlung processes from sphericallysymmetric low radiative-efficiency hot accretion flows around supermassive and galactic black holes. We calculate surface brightness profiles and Michelson visibility functions for a range of density profiles, ρ ∼ r−3/2+p, with 0 < p < 1, to allow for the presence of outflows. We find that although the 1 keV emitting...
This paper presents a simple method for modeling and rendering refractive objects that are nested within each other. The technique allows the use of simpler scene geometry and can even improve rendering time in some images. The algorithm can be easily added into an existing ray tracer and makes no assumptions about the drawing primitives that have been implemented.
We describe the method of noise model-based cosmic ray (CR) rejection in multiple, registered images, and discuss its implementation in the context of the STIS calibration pipeline. We focus on the method by which the various contributions to the uncertainty in the final, calibrated image should be combined. Unfortunately, the current design of the CR rejection module, calstis2, makes it diffic...
This paper presents work in progress on an approach to the problem of recognizing blasting caps in x-ray images. An analysis of functional properties of blasting caps was used to design the representation space, which combines intensity and shape features. Recognition proceeds in two phases. The rst phase is a bottom-up process in which low intensity blobs are used as attention-catching devices...
X-ray computed tomography (CT) is a popular tool for non-destructively producing cross-sectional and volumetric images of physical objects[1]. In this technology, an X-ray source and a detector are mounted on a rotating gantry, and X-ray images from many different angles are acquired and then passed to a reconstruction program to create volumetric images. Unfortunately, the gantry and the rotat...
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