Abstract—The purpose of this study is to develop low-cost real-time digital fringe projection measurement to detect the three-dimensional shape of the back in patients with scoliosis. The measurement system consists of a digital projector and a digital camera. The seven fringe patterns are used to illuminate a patient’s back while the digital images are captured by a camera. The height of the back shape is calculated using the seven-step phase-shifting calculation and path-independent phase unwrapping. The back topography with an accuracy of 1 mm can help the clinician to estimate the spinal deformity at baseline and monitor variations over time. The measurement results can be applied to clinical use and reduce the dependence on serial radiography for monitoring spinal deformity. 

Index Terms—fringe projection, phase shifting, scoliosis

Cite: Hung-Ju Chung, Shuo-Chih Chien, Ching-Hua Lu, and Cheng-Yang Liu, "Real-Time Digital Fringe Projection Measurement for Detecting Back Shape in Scoliosis," International Journal of Electronics and Electrical Engineering, Vol. 9, No. 3, pp. 65-69, September 2021. doi: 10.18178/ijeee.9.3.65-69