Estimation of Grip Strength using Monocular Camera for Home-based HandRehabilitation
Nagisa Matsumoto, Koji Fujita, Yuta Sugiura
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Nagisa Matsumoto, Koji Fujita, Yuta Sugiura, Estimation of grip strength using monocular camera for home-based hand rehabilitation, SICE Journal of Control, Measurement, and System Integration, Vol.14, No.1, Pages 1-11. [DOI]
Grip strength exercises are commonly used rehabilitation methods for recovery of hand function. They are easy to perform even without the direct support of a healthcare professional. However, without objective feedback, the patient may not be fully engaged in the rehabilitation process. To solve this problem, we developed a system for measuring grip strength in real time using a soft ball and a monocular camera. The system estimates the grip strength using the modeled relationship between the finger joint angles extracted from the camera image and the person’s grip strength. A patient can get the feedback as numbers or movements displayed on the screen. Experimental results showed that there is a correlation between the finger joint angles and the air pressure of a ball when squeezed. The average estimation error was 16.1hPa, and the average measurement range was 100-230 hPa. The estimation error was about 12 % of the measurement range. They also showed that there is a correlation between the air pressure of a ball and the applied force.