抄録
This paper treats the problems of three dimensional motion analysis of the upper extremity during ADL motion.
The measuring device is SELSPOT SYSTEM which is the electro-optical measuring device, using two electronic camera. The maximum number of targets is thirty. It can be used in brightly place. We conceived new correcting method for setting up the camera.
In this experiment, the subject were three normal persons and three hemiplegia persons.
1) Measuring Method
The measurement is the 90 degrees optical-axis cross method. The optical-axis of two camera were set up 90 degrees of cross-position on space. This method facilitates the calculation of three dimensional coordinate, and is decreased the calculating error of data.
2) Correcting Method
This method uses two standard targets. LED-a is set up the position near the origin of three dimensional coordinate. Another LED-b is set up at the constant distance of the vertical line from LED-a. These two standard LED's are used for calculating the following values. And the setting position of two camera are adjusted by knowing to these values.
a) Focul distance of each camera.
b) Distance ratio of each camera from the origin of three dimensional coordinate.
c) Horizontal angle of each camera on space.
Above methods are very useful for measuring the three coordinate because it is very simple and reliable.
We believed firmly in the result of experiment that this measurement method is most suitable; for the upper extremity motion analysis.
