LightGyro:A Light-based Orientation Measuring Scheme Using Batteryless Reflective Film

In industrial production, the orientation of facility is a powerful indicator to verify whether the facility is in a normal operating track. In this paper, we present LightGyro, a cheap and efficient batteryless scheme to measure the facility orientation, it leverages the orientation amplification effect of reflection to improve the measuring accuracy to one degree. LightGyro system is composed of low-cost camera, batteryless reflective film and LEDs. In the working process of LightGyro, we attach a reflective film to the target and let it reflect the light from LEDs to the camera. Then the LightGyro would extract the LED-related spots in the captured frame and restore the reflection route to measure the orientation. To extract the LED-related spots from complicated background automatically, we propose to leverage the affine transformation to search for the topology of multiple spots which is related to the deployed LED array. To address the dimension missing issue caused by camera projection and restore the reflection route, we propose a light array-based reflection model to extract the missing dimension from relative positions of multiple spots. To the best of our knowledge, this is the first work to utilize light reflection to measure orientation. Our experiments show that the average accuracy of LightGyro achieves less than 2 ^◦ . When the reflective film is far from the camera, the mean error is less than 1 ^◦ .