Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (07): 128-132.doi: 10.13475/j.fzxb.20180806205

• Apparel Engineering • Previous Articles     Next Articles

Calculation of circumference size based on human body section point cloud

LI Xiaozhi, LI Xiaojiu, LIU Hao   

  1. School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2018-08-06 Revised:2019-03-22 Online:2019-07-15 Published:2019-07-25

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Abstract:

In order to simplify the calculation process on the circumference size, the coordinates of section points in space were first transformed to 2-D plane. Then by the quick comparing sorting, four extreme points were acquired, and based on the extremes points the point set was divided into four subsets. The convex hull of every subset was monotonous, so some concave points were directly deleted by sorting and comparing the coordinates x and z. The final convex hull points were determined by the inner angle of the adjacent three points calculated by the cross product. The line by connecting the points in order was the body circumference line and its length was the size. Comparing with the Graham scanning method, the method has the same time complexity and same results. However, it is easier to be programmed, and by simplifying the point set by easily sorting and comparing, the method can reduce the number of backtracks and effectively improve the computing efficiency of body's circumference sizes.

Key words: human body section, point set in plane, circumference size, convex hull, cross product

CLC Number: 

  • TP391.72

Fig.1

Transformation of human section's coordinates. (a) Human body's space coordinates; (b) Sections' plane coordinates"

Fig.2

Division of bust cloud point"

Fig.3

Traversal direction. (a)From extreme point z to x direction; (b) From extreme point x to z direction"

Fig.4

Subsets after sorting by monotonicity"

Fig.5

Inside angle of adjacent three points"

Fig.6

Extracting bust line. (a) Subset convex hull; (b) Section point cloud of bust line and its convex hull"

Fig.7

Extracting waist line and hip line. (a) Section point cloud of waist line and its convex hull; (b) Section point cloud of hip line and its convex hull"

Fig.8

Methods comparison of extracting convex hull"

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