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International Conference on Computer Vision, Theory and Applications (VISAPP 2025)

 
Joint Calibration of Cameras and Projectors for Multiview Phase Measuring Profilometry
 
 
       
  Hyeongjun Cho Min H. Kim  
  KAIST  
       
  teaser
  (a) Phase-shifting pattern examples with a frequency (f =4). (b) The reconstructed phase map. (c) Phase maps of four different frequencies. (d) Final unwrapped phase map from camera 1.  
     
     
   
  Abstract
   
  Existing camera-projector calibration for phase-measuring profilometry (PMP) is valid for only a single view. To extend a single-view PMP to a multiview system, an additional calibration, such as Zhang’s method, is necessary. In addition to calibrating phase-to-height relationships for each view, calibrating parameters of multiple cameras, lenses, and projectors by rotating a target is indeed cumbersome and often fails with the local optima of calibration solutions. In this work, to make multiview PMP calibration more convenient and reliable, we propose a joint calibration method by combining these two calibration modalities of phase-measuring profilometry and multiview geometry with high accuracy. To this end, we devise (1) a novel compact, static calibration target with planar surfaces of different orientations with fiducial markers and (2) a joint multiview optimization scheme of the projectors and the cameras, handling nonlinear lens distortion. First, we automatically detect the markers to estimate plane equation parameters of different surface orientations. We then solve homography matrices of multiple planes through target-aware bundle adjustment. Given unwrapped phase measurement, we calibrate intrinsic/extrinsic/lens-distortion parameters of every camera and projector without requiring any manual interaction with the calibration target. Only one static scene is required for calibration. Results validate that our calibration method enables us to combine multiview PMP measurements with high accuracy.
   
  BibTeX
 
@InProceedings{Cho:visapp2:2025,
  author  = {Hyeongjun Cho and Min H. Kim},
  title   = {Joint Calibration of Cameras and Projectors 
            for Multiview Phase Measuring Profilometry},
  booktitle = {Proc. Int. Conf. Computer Vision, 
            Theory and Applications (VISAPP 2025)},
  address = {Porto, Portugal},
  year = {2025},
  pages = {},
}     

   
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