Volume 14 Issue 3
Jun.  2025
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CHAI Jiahui, LI Minglei, LI Min, et al. ResCalib: Joint LiDAR and camera calibration based on geometrically supervised deep neural networks[J]. Journal of Radars, 2025, 14(3): 616–628. doi: 10.12000/JR24233
Citation: CHAI Jiahui, LI Minglei, LI Min, et al. ResCalib: Joint LiDAR and camera calibration based on geometrically supervised deep neural networks[J]. Journal of Radars, 2025, 14(3): 616–628. doi: 10.12000/JR24233
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ResCalib: Joint LiDAR and Camera Calibration Based on Geometrically Supervised Deep Neural Networks

DOI: 10.12000/JR24233 CSTR: 32380.14.JR24233
  • 1.

    College of Electronic and Information Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 211106, China

  • 2.

    Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing 211106, China

  • 3.

    China National Aeronautical Radio Electronics Research Institute, Shanghai 200233, China

Funds:  The National Natural Science Foundation of China (42271343), Open Project Funds for the Joint Laboratory of Spatial Intelligent Perception and Large Model Application
More Information
  • Corresponding author: LI Minglei, minglei_li@nuaa.edu.cn
  • Received Date: 2024-11-24
  • Rev Recd Date: 2025-01-11
    • Available Online: 2025-01-15
  • Publish Date: 2025-01-25
    Abstract
  • Light Detection And Ranging (LiDAR) systems lack texture and color information, while cameras lack depth information. Thus, the information obtained from LiDAR and cameras is highly complementary. Therefore, combining these two types of sensors can obtain rich observation data and improve the accuracy and stability of environmental perception. The accurate joint calibration of the external parameters of these two types of sensors is the premise of data fusion. At present, most joint calibration methods need to be processed through target calibration and manual point selection. This makes it impossible to use them in dynamic application scenarios. This paper presents a ResCalib deep neural network model, which can be used to solve the problem of the online joint calibration of LiDAR and a camera. The method uses LiDAR point clouds, monocular images, and in-camera parameter matrices as the input to achieve the external parameters solving of LiDAR and cameras; however, the method has low dependence on external features or targets. ResCalib is a geometrically supervised deep neural network that automatically estimates the six-degree-of-freedom external parameter relationship between LiDAR and cameras by implementing supervised learning to maximize the geometric and photometric consistencies of input images and point clouds. Experiments show that the proposed method can correct errors in calibrating rotation by ±10° and translation by ±0.2 m. The average absolute errors of the rotation and translation components of the calibration solution are 0.35° and 0.032 m, respectively, and the time required for single-group calibration is 0.018 s, which provides technical support for realizing automatic joint calibration in a dynamic environment.

     

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