Investigating the precision of 3D scanner systems based on digital fringe projection method for biomedical engineering applications

3D scanners are among the equipment widely used in 3D measurement and are mainly used in various areas such as robotic systems, manufacturing, medicine, etc. There are many types of scanners, including scanners that use the structured light technique, especially the digital fringe projection method for 3D imaging. This research aims to investigate the accuracy and precision of these scanners for biomedical engineering applications, specifically in prosthesis' socket design. The 3D scanner used in this paper has been developed based on digital fringe projection. The three-dimensional measurement process in this system includes two main steps: calibration and imaging of patterns projected on the object. Also, by applying appropriate adjustments, effective parameters in 3D reconstruction and calibration error were optimized. To evaluate the accuracy, speed, and quality of the output images of this system in measuring objects and their interaction with the human body, two validation, and clinical tests were designed and performed, respectively. By examining the available results and obtaining the average system error, it was found that the scanner system can calculate the dimensions of the object with 97% accuracy measurement. This accuracy would be suitable for use in clinical applications.