Catadioptric Stereo on a Smartphone
This provides a practical and affordable solution for stereo imaging on smartphones, making it accessible beyond high-end devices with expensive sensors.
The authors tackled the problem of enabling stereo reconstruction on any smartphone by designing a low-cost 3D printed adapter with planar mirrors, which allowed for 3D human pose reconstruction and anthropometric measurements of body segments.
We present a 3D printed adapter with planar mirrors for stereo reconstruction using front and back smartphone camera. The adapter presents a practical and low-cost solution for enabling any smartphone to be used as a stereo camera, which is currently only possible using high-end phones with expensive 3D sensors. Using the prototype version of the adapter, we experiment with parameters like the angles between cameras and mirrors and the distance to each camera (the stereo baseline). We find the most convenient configuration and calibrate the stereo pair. Based on the presented preliminary analysis, we identify possible improvements in the current design. To demonstrate the working prototype, we reconstruct a 3D human pose using 2D keypoint detections from the stereo pair and evaluate extracted body lengths. The result shows that the adapter can be used for anthropometric measurement of several body segments.