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Kinematics parameter capturing method based on visible spatial expansion of optical motion capturing system

A kinematic parameter and optical motion technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as the increase in the number of cameras, reduce the number of cameras, reduce equipment costs, and solve the effect of occlusion problems

Active Publication Date: 2016-08-10
THE SECOND PEOPLES HOSPITAL OF SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the minimum number of cameras increases due to the occlusion of the marking points in the optical motion capture system, and to provide a kinematic parameter capture method based on the expansion of the visible space of the optical motion capture system

Method used

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  • Kinematics parameter capturing method based on visible spatial expansion of optical motion capturing system
  • Kinematics parameter capturing method based on visible spatial expansion of optical motion capturing system
  • Kinematics parameter capturing method based on visible spatial expansion of optical motion capturing system

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine Figure 1 to Figure 4 Describe this embodiment, the kinematics parameter capture method based on the visual space expansion of the optical motion capture system described in this embodiment is realized based on the optical motion capture system, a plane mirror and a calibration tool, the optical motion capture system includes three camera, the calibration tool is a flat structure, and the kinematic parameter capture method is:

[0017] Step 1. Fix the optical markers that come with the optical motion capture system on the object to be measured, place the plane mirror in front of the three cameras, and set the gait path. The optical markers that cannot be observed by the camera are imaged, and the image points in the mirror fall into the field of view of the camera;

[0018] Step 2, start the optical motion capture system, make the object to be measured walk along the gait route, and collect the coordinate data of the optical ma...

specific Embodiment approach 2

[0023] Specific implementation mode two: combination Figure 1 to Figure 4 This embodiment is described. This embodiment uses the NDIcertus motion capture system to simultaneously capture the optical markers pasted on both sides of the lower extremity through the reasonable arrangement of plane mirrors and mirror reflection, so as to obtain the kinematic data of both sides. Such as figure 1 As shown, two optical markers are pasted on both sides of the lower limbs of the subject to be tested, where points A and B are located on the side close to the camera, and points C and D are located on the side close to the plane mirror. The NDIcertus motion capture system includes three cameras, which is the minimum number of cameras.

[0024] The position of the plane reflector must ensure that within a selected gait cycle distance, the image points formed by the plane reflector (that is, the image points of points C and D) are not blocked by the human trunk or lower limbs. The arrangem...

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Abstract

The invention discloses a kinematics parameter capturing method based on visible spatial expansion of an optical motion capturing system, and relates to a human body in vivo and in vitro joint kinematics parameter capturing technology, aiming at solving the problem that the least number of cameras of an optical motion capturing system is increased in the case that mark points are sheltered. The method comprises the following steps: arranging a plane reflector in front of cameras, so that the images of sheltered optical mark points are within the view field of the cameras; making a to-be-detected object walk along a gait path, and collecting optical mark point and image point coordinate data on the to-be-detected object; immobilizing the three optical mark points on the front side of a calibration tool, immobilizing a fourth optical mark point on the back side, and then making the calibration tool move along the gait path so as to collect optical mark point and image point coordinate data; and finally, calculating a relation between the image point coordinates and corresponding actual optical mark point coordinates, and reducing the image point coordinates of the to-be-detected object into the actual optical mark point coordinates. The kinematics parameter capturing method is applicable to human body in vivo and in vitro specimen motion experiments.

Description

technical field [0001] The invention relates to a technology for capturing kinematic parameters of human body in-body and out-of-body joints. Background technique [0002] Motion capture is a widely used method for obtaining kinematic parameters in the motion activity experiments of human in vivo motion and human isolated specimen motion. Human body movement experiment refers to analysis of human body gait and posture analysis under different daily activities, such as gait space-time parameters; described human body isolated specimen movement experiment refers to joints of corpses such as spine and limbs under external loading conditions. Sports analysis. [0003] There are various types of motion capture methods and devices currently on the market. From the point of view of real-time behavior, it is divided into real-time motion capture system and non-real-time motion capture system; from the point of view of the working method of marking points, it is divided into active...

Claims

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Application Information

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IPC IPC(8): A61B5/11
CPCA61B5/112A61B5/1127
Inventor 蒯声政周文钰廖振华郭岱琦柯昌宝张睿刘伟强
Owner THE SECOND PEOPLES HOSPITAL OF SHENZHEN