Automatic eating detection using a proximity sensor

Eating detection is a critical component in a wearable dietary monitoring device called eButton under our investigation. Once an eating activity is detected, a camera within the device is activated to take pictures of food automatically which is then processed to measure intakes of calories and nutrients. In this paper, we address the eating detection problem using a proximity sensor within the eButton. The repetitive movements of the arm during eating are monitored by a proximity sensor within a fan-shaped region. An infrared light emitter and a photo receiver produce signals when the infrared light is blocked. Our test results show that eating activity can be detected and distinguished from other activities. In addition, our method is unobtrusive, low power, and of a small size, suitable to be used in wearable devices.