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Apparatus and method for motion tracking of at least a portion of a limb

A technology of motion tracking and limbs, applied in application, medical science, diagnosis, etc., can solve problems such as low-accuracy instantaneous joint position estimation, and achieve the effect of solving occlusion problems

Active Publication Date: 2018-03-27
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although interpolation can help overcome this problem, it provides low accuracy estimates of instantaneous joint positions

Method used

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  • Apparatus and method for motion tracking of at least a portion of a limb
  • Apparatus and method for motion tracking of at least a portion of a limb
  • Apparatus and method for motion tracking of at least a portion of a limb

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Embodiment Construction

[0041] The present invention will be described with respect to particular embodiments and with reference to certain drawings but the invention is not limited thereto but only by the claims. The drawings described are only schematic and not restrictive. In the drawings, the size of some of the elements may be exaggerated and not drawn on scale for illustrative purposes.

[0042] figure 1 is a schematic diagram of an apparatus for motion tracking of an upper limb according to an embodiment of the present invention, which includes a marker attached to the subject's hand 110b, a motion sensor 110c attached to the upper limb, a camera 120 positioned in front of the subject, and A processor (not shown) estimates movement of the upper extremity. The upper body consists of two straight sections: the upper arm and the forearm. Embodiments relating to estimating only the movement of the upper arm or forearm will be discussed later. Although in figure 1 The camera is illustrated as ...

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PUM

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Abstract

The invention proposes an apparatus for motion tracking of at least a portion of limb comprising two jointed straight portions. The apparatus comprises a motion sensor (110c) to be attached to a portion of the limb for measuring orientation of the portion of the limb; a camera (120) for capturing images of the portion of the limb in motion with a marker attached at a predefined position (110a, 110b, 110d) of the portion of the limb, a location of the marker in each image captured by the camera being a reference location; a processor for estimating movement of the portion of the limb based on reference locations, the orientation corresponding to each reference location, a predetermined length of the portion of limb and the predefined position. Instead of tracking the locations of joints inthe images directly, locations are derived based on the location of one marker observable and according orientation information. In this way, the occlusion problem is solved and the movement of the limb can be estimated based on an accurate and instantaneous measurement of locations of interest.

Description

technical field [0001] The present invention relates generally to motion tracking of at least a portion of a limb, and more particularly to motion tracking of at least a portion of a limb in rehabilitation. Background technique [0002] Stroke is one of the leading causes of death worldwide, and most stroke survivors suffer from numerous functional disabilities. One of the most common types of dysfunction is motor dysfunction. Long-term rehabilitation is required to help patients improve their exercise capacity. Typically, patients are hospitalized for about a month and then discharged home due to the limited number of treating specialists and rehab centers. Therefore, unsupervised rehabilitation systems have been developed to help patients at home achieve their maximum possible level of recovery. [0003] WO2014108824A1 discloses a vision-based motion tracking system for rehabilitation. The system has a camera that captures an image of a limb in motion, with markers att...

Claims

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Application Information

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IPC IPC(8): A61B5/107
CPCA61B5/107
Inventor 陈城王进
Owner KONINKLJIJKE PHILIPS NV
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