Measuring method of body measurements
A measuring method and measuring instrument technology, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems of complex operation, high production cost, narrow and unpopular use range, etc., and achieve high instrument accuracy, small footprint, Simple and clear effect
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Embodiment 1
[0041] Specifically, the present invention adopts a convex polygon measurement method, and the measured body measurements are a convex closed curve. According to this characteristic, a convex polygon is used to approximate this curve. Figure 4 It is a schematic diagram of a convex polygon in Embodiment 1 of the present invention.
[0042] Rotating stepping motor is set the angle of rotation according to the collection point of actual needs, in the present embodiment, is 8 points of collecting data, then the angle of each rotation of control rotating stepping motor is 360 ° / 8=45 °, moves to next collection point. It is also possible to input different settings to the rotary stepper motor according to the size of the chest circumference, waist circumference or hip circumference of the subject. At the same time, according to the maximum height and minimum height of the human body, the absolute length of the up and down operation of the lifting stepper motors of each circumferen...
Embodiment 2
[0048] The difference between this embodiment and Embodiment 1 is that the number of convex polygons is different, and this embodiment uses a convex 16-gon approximation to calculate the length of the waistline curve. Therefore, the calculation formula of the present embodiment is: when P=16, the perimeter of the convex polygon is:
[0049] C16=2×(d1+d2+d3+d4+d5+d6+d7+d8) / (1+2cosθ+2cos2θ+2cos3θ), where θ=22.5°.
[0050] As mentioned in the first embodiment, how many points are used to collect data is preset in the tester. For example, in this embodiment, a convex 16-gon is used. After measuring the vertical distance between two parallel sides, the sum of the sides of the convex 16-gon, that is, the perimeter, can be calculated according to the formula. Obviously, the more points collected during the test, the higher the measurement accuracy will be.
[0051] Other content in this embodiment is the same as that in the foregoing embodiment, and will not be repeated here.
Embodiment 3
[0053] The difference between this embodiment and Embodiment 1 and Embodiment 2 still lies in the number of convex polygons. In this embodiment, a convex 32-gon approximation is used to calculate the length of the hip circumference curve. Therefore, the calculation formula of this embodiment is: when P=32, the perimeter C32 of the convex polygon=2×(d1+d2+…+d16) / (1+2cosθ+2cos2θ+2cos3θ+2cos4θ+2cos5θ+2cos6θ+ 2cos7θ), where θ=11.25°.
[0054] Other content in this embodiment is the same as that in the foregoing embodiment, and will not be repeated here.
[0055] For the accuracy of measurement, it is possible to approach a circle with a calculation radius of 1m with the model given below to calculate its circumference, and use this as a reference for the measurement accuracy of the present invention:
[0056] A circle with a radius of 1m has a circumference of 2×π×r=2×3.14159×1=6.28318m;
[0057] C8=16 / (1+2×COS45°)=6.62742m, the error is: 5.5%;
[0058] C16=32 / (1+2×COS22.5°+2×C...
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