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Toshihiro Shinohara 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, an expression method of each individual woven yarn of textile fabric is proposed for structure analysis of textile fabric on its three-dimensional (3D) image obtained by X-ray computed tomography (CT) images. In this method, the voxels of the 3D CT image is segmented into each yarn based on the yarn positional information, which is the sequence of the yarn center points. In order to extract the yarn positional information, the directions of the filaments are firstly estimated at all the voxels of the 3D CT image by correlating the voxel values with a filament model. Each filament is secondly reconstructed by connecting the voxels of the filaments based on the estimated filament directions. Each yarn is then reconstructed by binding up the reconstructed filaments using a newly defined distance between two filaments. Finally, the yarn positional information is obtained by thinning the reconstructed yarns. The voxels of the 3D CT image is segmented into each yarn based on a newly defined dissimilarity to the extracted yarn positional information. Using the segmented voxels, each individual yarn is expressed with volume rendering. The effectiveness of the proposed yarn expression method is discussed by experimentally applying this method to 3D image of a plain knitted fabric.
Automatic Weave Diagram Construction from Yarn Positional Information of Weft-knitted Fabric
Toshihiro Shinohara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, a novel automatic construction method of a weave diagram using yarn positional information of a weft-knitted fabricis proposed. The yarn positional information is a sequence of the centerpoints of the yarn in this study, which is obtained using a yarn tracing method proposed in my previous study. Constructing a weave diagram corresponds to identifying the stitch type at each stitch of the knitted fabric. For constructing a weave diagram, first, the position of each stitchis detected by in vestigating the cross points between the yarns. Then, the types of stitches are identified by investigating which stitch the stitch intersects with. The validity of the proposed automatic weave diagram construction method is confirmed by experimentally applying the method to yarn positional infomation of a plain knitted fabric.
Noboru Nakasako,Shimpei Hanabusa,Toshihiro Shinohara,Tetsuji Uebo 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In many engineering fields, distance to target is very important and fundamental information. In a research field of microwave, a method for measuring the short distance has been proposed using interference (i.e. standing wave) of the transmitted and reflected waves. We applied the fundamental principle of this method to the estimation of the short distance using the audible sound as a transmitted wave. Then, we assumed that the microphone was set on the straight line between a sound source and the target. However, the microphone is not always set on the straight line due to the restriction of measuring environment. This paper describes a principle and compensation method of the distance estimation using the geometrical information on alignment of the sound source and microphone in such a situation. Then, we experimented in an actual sound field to confirm the validity and effectiveness of our proposed method using a transmitted wave with uniform amplitude and random phase characteristics.