A Collection of Static Human Body Dimension Relating to 3D Human Body Range Data.
| Autor: | 張永忠 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 The objective of this study was to develop a research scheme for 3D anthropometrical survey, by designing a series of postures for measurement and then to identify anatomical landmarks based on the 3D measured data for the extraction of 1D, 2D and 3D measurements. Due to advent of 3D human scanner, 3D body anthropometrical measurements become more and more rapid and easier. Nevertheless it was found that it was usually difficult to obtain most of commonly used measurements as listed in Webb Associates. This difficulties can be attributed to three problems: (1) some measurements (e.g. overhead reach or armpit high) can not be taken with a sole standard anatomical posture, rather they should only be taken with specific postures; (2) some measurements (e.g. finger length and outer-ocular) require a higher resolvable data for identification of necessary landmarks in detail; and (3) some measurements (e.g. bi-zygomatic arch breadth) which were traditionally taken by palpation are not easy to identify on monitors. In order to obtain as many measurements as commonly necessary, this study designed a measurement posture scheme which consists of 4 whole body postures and 7 high resolution localized postures. The former consists of three standing postures and one sitting posture; and the latter consists of four hand postures, two foot postures and one head posture. These postures can be used to identify 120 anatomical landmarks and in turn to extract 231 measurements, 191 1Ds, 26 2Ds, 7 3D surfaces and 7 3D volumes. In order to identify these 120 anatomical landmarks, segmental concatenation method and density method were proposed in addition to the existing feature-identification method and ratio method. The feature-identification method is used to identify the landmarks with prominent features, for instance, nose tip is the peak in the mid region of mid-sagittal contour. The ratio method, based on statistics, offer the values for the boundary of a landmark, for instance, the nose tip is normally between 40% to 70% of head length. The segmental concatenation method is to concatenate high resolvable local measurements to whole body measurements for specific measurement extraction. The density method is used to identify the landmarks consisting of sharp curvature, for instance, umbilicus is the convex point where the abdominal surface curves in sharply. In the neighborhood of umbilicus, a lattice grid is drawn, for each grid, the number of triangle meshes is counted, all the grids with dense meshes is then picked and then fitted with a curve. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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