Abstract
This paper is aiming to obtain an arm-root curve function performing the human arm-root size and shape realistically. A gypsum replica of upper arm for young male was made and scanned for extracting the 3D coordinates of 4 feature points of shoulder point, the anterior/posterior armpit point and the axillary point describing the real arm-root shape under the normalized definitions, and the 5 landmarks were confirmed additionally for improving the fitting precision. Then, the wholly and piecewise fitting of arm-root curve with 9 feature points and mark points in total were generated respectively based on least square polynomial fitting method. Comparing to the wholly fitting, the piecewise fitted function segmented by the line between anterior and posterior axillary points showed a high fitting degree of arm-root morphology with R-square of 1, the length difference between fitted curve and gypsum curve is 0.003 cm within error range. And it provided a basic curve model with standard feature points to simulate arm-root morphology realistically by curve fitting for accurate body measurement extraction.
Highlights
The body surface feature points are the basic unit for both contact and non-contact measurements for gathering human morphometrical data [1]
It provided a basic curve model with standard feature points to simulate arm-root morphology realistically by curve fitting for accurate body measurement extraction
The 3D coordinates of arm-root feature points were extracted from upper arm gypsum replica point cloud are used to obtain arm-root curve by function model fitting method, and it is going to be used as a basic template curve model for various arm-root shape fitting and underarm data renovating
Summary
The body surface feature points are the basic unit for both contact and non-contact measurements for gathering human morphometrical data [1]. For improving the accuracy and efficiency of measuring on body surface, Hyunsook Han et al measured the underarm circumference generated by a b-spline curve using the method of interpolating the front armpit folding point, armpit point, and back armpit folding point on the obscured underarm area, and the armscye circumference was shorter than the manual measuring with large SD [4] They used the arm and torso intersect point as armpit point which is lower than actual armpit point and the armscye circumference was larger than the manual measuring, especially for an overweight person. Danhua Li [5] proposed a feature point extracting method of arm-root according to the point whose gain value is greater than the geometric threshold These researches presented the common measurement methods of armscye circumference on processed 3D mannequins currently, the semantic landmark identifications adopted arm-root curve generations, but it did not reflect the actual curve of underarm due to the surface data unavailable. The 3D coordinates of arm-root feature points were extracted from upper arm gypsum replica point cloud are used to obtain arm-root curve by function model fitting method, and it is going to be used as a basic template curve model for various arm-root shape fitting and underarm data renovating
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