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An accurate projector calibration method based on polynomial distortion representation.

Miao Liu1, Changku Sun2, Shujun Huang3

  • 1State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. excalibur_s@tju.edu.cn.

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Summary
This summary is machine-generated.

This study introduces a novel projector calibration method using photodiodes to directly measure light output. This approach enhances accuracy and overcomes limitations of traditional calibration techniques for 3D printing and optical measurement systems.

Keywords:
3D printingaberration compensationphotodiodeprojector calibrationstructure light measurementsubpixel measurement

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Computer Vision

Background:

  • Optical distortion in digital projectors significantly impacts precision in 3D printing and structured light measurement systems.
  • Current calibration methods often rely on calibration plates and photogrammetry, which are sensitive to the quality of imaging systems and plates.

Purpose of the Study:

  • To propose and validate a new projector calibration method that directly measures light emission.
  • To improve the accuracy and reliability of projector calibration by mitigating issues associated with traditional techniques.

Main Methods:

  • Utilizing photodiodes to directly detect light emitted from a digital projector.
  • Analyzing the output sequence from a photoelectric module to determine pixel coordinates via curve fitting.
  • Employing a polynomial distortion representation for improved modeling accuracy.

Main Results:

  • The proposed method accurately obtains pixel coordinates by analyzing photodiode output sequences.
  • A polynomial distortion model demonstrated reduced residuals compared to traditional models.
  • Experimental results confirmed higher accuracy and avoidance of common disadvantages found in existing calibration methods.

Conclusions:

  • The novel photodiode-based projector calibration method offers superior accuracy and reliability.
  • This technique is practical for evaluating the geometric optical performance of various projection systems.
  • It provides a robust alternative to conventional calibration approaches, enhancing precision in optical measurement and 3D printing.