Measurement Linearity and Accuracy Optimization for Time-of-Flight Range Imaging Cameras

Time-of-flight (TOF) range imaging is a new method for 3d measurement and modeling in many scenarios. The time-of-flight imaging system using amplitude modulated continuous wave (AMCW) technology often suffers from measurement non-linearity because of aliasing harmonics, and temperature changes. It is required to correct these errors by using calibration. We demonstrate a correction method based on Delay Line (DLL). The proposed method has advantages of operation simplicity, fast calibration time. The experimental results show that the method can improve the linearity and accuracy of the TOF camera.