The recent development of electro-optical instrumentation allowed constructing 4d (3d + time) structure-light scanners which may be used to measure the surface of human body in motion. The main advantage of structure-...
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ISBN:
(纸本)9780819470232
The recent development of electro-optical instrumentation allowed constructing 4d (3d + time) structure-light scanners which may be used to measure the surface of human body in motion. The main advantage of structure-light scanners is the possibility of capturing data from the whole measured body surface, while traditional marker-based systems acquire data only form markers attached to skin of the examined patient. The paper describes new parameters describing the local shape of measured surface. The distribution maps of these parameters allow discrimination of various surface types and in effect localization and tracing of under-skin anatomical structures in time. The presented parameters give similar results to well-known curvatures but are easier and quicker to calculate. Moreover the calculation process of the new parameters is more numerically stable itself. The developed path of processing and analysis of 4d measurement data has been presented. It contains the following stages: data acquisition, volumetric model creation, calculations of shape parameters, selecting areas of interest, locating and tracing of anatomical landmarks. Exemplary results of application of developed parameters and methods to real measurement and computer generateddata are also presented.
New optical full-field shape measurement systems allow transient shape capture at rates between 15 and 30 Hz. These frequency rates are enough to monitor controlled movements used e.g. for medical examination purposes...
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ISBN:
(纸本)0819460575
New optical full-field shape measurement systems allow transient shape capture at rates between 15 and 30 Hz. These frequency rates are enough to monitor controlled movements used e.g. for medical examination purposes. In this paper we present a set of algorithms which may be applied for processing of data gathered by fringe projection method implemented for lower limbs shape measurement. The purpose of presented algorithms is to locate anatomical structures based on the limb shape and its deformation in time. The algorithms are based on local surface curvature calculation and analysis of curvature maps changes during the measurement sequence. One of anatomical structure of high medical interest that is possible to scan and analyze, is patella. Tracking of patella position and orientation under dynamic conditions may lead to detect pathological patella movements and help in knee joint disease diagnosis. Therefore the usefulness of the algorithms developed was proven at examples of patella localization and monitoring.
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