Rigoberto Juarez-Salazar, Sofia Esquivel-Hernandez, and Victor H. Diaz-Ramirez, “Are camera, projector, and camera–projector calibrations different?” Applied Optics, Vol. 62, Issue 22, pp. 5999-6006 (July 2023).
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What is it about? Español
Calibration of cameras and projectors is critical for accurate 3D reconstruction by structured light projection. Although cameras and projectors are mathematically equivalent, and efficient camera calibration methods are available, the calibration of a structured light system often needs to be clarified.
Why is it important?
It is erroneously assumed that the calibration of a camera–projector pair differs from calibrating a camera. Also, it can be hard to understand that the calibration of a projector is possible without an attached auxiliary camera. This paper presents a unified methodology for camera, projector, and camera–projector calibrations. The MATLAB code and data employed in this paper are provided for quick testing and implementation guidance.
This paper is a helpful review of the calibration process. First, the analysis emphasizes that there is no difference between cameras and projectors. Then, intuitive insights are discussed to explain that if the camera and projector are elements of a structured light projection system, the camera is an auxiliary for the projector, but at the same time, it is being calibrated by applying camera–projector calibration.