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	Measurement system for 3-D foot shapes under different loads
	Liu Guozhong ; Wang Boxiong ; Shi Hui ; Luo Xiuzhi ; Wang Rui
	2010-05-10 ; 2010-05-10
会议名称	International Technology and Innovation Conference 2006. ITIC 2006 ; International Technology and Innovation Conference 2006. ITIC 2006 ; Hangzhou, China ; INSPEC
关键词	Practical/ calibration CCD image sensors design engineering footwear footwear industry image processing measurement by laser beam optical images optical scanners orthopaedics pressure sensors stress analysis/ measurement system 3-D foot shapes foot parameters foot length foot ball width foot heel width foot ball girth toe height arch height ankle height arch curve footprint shoe design plantar stress analysis orthopaedic treatment servo motor load measurement unit vision sensor unit synchronous multichannel image capturing unit laser line-scanning triangulation method foot image acquisition pressure sensors calibration method inclined planes space mapping image processing laser stripe sub-pixel detection Dilation-Thinning method CCD cameras/ E3612 Footwear industry E1400 Design E1620 Measurement E1640 Instrumentation E1650 Standards and calibration E1780 Products and commodities
中文摘要	A measurement system for 3-D foot shapes under different loads is described, which can automatically extract foot parameters such as foot length, ball width, heel width, ball girth, toe height, instep height, arch height, ankle height, arch curve and footprint. The information on how the foot shape changes with loads is important for shoe designing, plantar stresses analysis and orthopaedic treatment. The measurement system consists of a motion unit driven by a servo motor, a load measurement unit, a vision sensor unit and a synchronous multi-channel image capturing unit. The measurement system is developed based on the laser line-scanning triangulation method, including four groups of vision sensors for foot image acquisition, realizing a full range of 360 degree profile coverage from foot heel to toe. The load measurement unit composed of pressure sensors can measure and display foot loads in-time. A global calibration method based on scanning the inclined planes in four different orientations combined with a space mapping is employed to reduce the nonlinearity of the system. In image processing, Two-Step method is put forward for the laser stripe sub-pixel detection and the Dilation-Thinning method is adopted for the assembly of stripes from all CCD cameras. The system is verified through the measurement of the foot loads and foot shapes for 4 persons. The results are presented.
会议录出版者	Inst. of Eng. and Technol ; Stevenage, UK
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/19302]
专题	清华大学
推荐引用方式 GB/T 7714	Liu Guozhong,Wang Boxiong,Shi Hui,et al. Measurement system for 3-D foot shapes under different loads[C]. 见:International Technology and Innovation Conference 2006. ITIC 2006, International Technology and Innovation Conference 2006. ITIC 2006, Hangzhou, China, INSPEC.

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