Laser & Optoelectronics Progress, Volume. 60, Issue 8, 0811028(2023)
Triangular Series Fitting-Based Harmonic Error Correction Method for Indirect Time-of-Flight Camera
A swinging harmonic error occurs between the measured distance of the indirect time-of-flight (ITOF) camera and the real distance due to the nonideal factors of the optical waveform of the laser transmitter and the tap response of the imaging sensor. The harmonic error can interfere with the accuracy of distance measurement. This paper analyzes the causes of harmonic error in ITOF cameras and clarifies the relationship between the harmonic error period, ranging period, and number of pixel taps. Based on triangular series fitting, this work proposes a method to correct such harmonic errors in a short calibration range and a large calibration step, which improves the calibration efficiency. The effectiveness of the proposed method is verified through 66.67 MHz 3-tap ITOF camera ranging experiments. The experimental results show that the average distance measurement accuracy of the principal point pixel is 2.5787 mm, while the average plane fitting error in the plane distance measurement is 4.3876 mm. Thus, the findings emphasize that the proposed method can effectively reduce the harmonic errors in distance measurements using ITOF cameras.
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Zhaoxiang Jiang, Zhan Song, Zhenzhong Xiao, Xuan Ma, Shaoguang Shi, Fei Wang. Triangular Series Fitting-Based Harmonic Error Correction Method for Indirect Time-of-Flight Camera[J]. Laser & Optoelectronics Progress, 2023, 60(8): 0811028
Category: Imaging Systems
Received: Jan. 5, 2023
Accepted: Feb. 6, 2023
Published Online: Apr. 13, 2023
The Author Email: Xiao Zhenzhong (xiaozhenzhong@orbbec.com)