Self-measurement of 3D Leg Shape Using a Smartphone Through a Mirror

In this paper, we propose a self-measurement method of 3D leg shape for edema evaluation using only a smartphone and a mirror. In our method, patients can measure the 3D shape of their own leg by themselves at home. To obtain the initial shape of the leg, the user performs 3D scanning of a partial leg seen in a mirror. For the reconstruction of the unseen portion of the leg, ellipse fitting is applied to the slice images along the height of the leg. The 3D mesh of estimated full leg is reconstructed by connecting points on the ellipses. As the qualitative result, the estimated 3D mesh of leg shape from the partial leg seen through the mirror was obtained. For the accuracy measurement, we compared the estimated 3D leg shape with the original full leg shape by summing up the areas of the slice images for each estimated leg portion and the actual full leg portion as the quantitative result. It can be seen that our proposed method can reconstruct the 3D shape of whole leg from the partial portion of the leg seen through the mirror with sufficient accuracy.