Abstract

This Letter presents a novel, to the best of our knowledge, method to calibrate multi-focus microscopic structured-light three-dimensional (3D) imaging systems with an electrically adjustable camera focal length. We first leverage the conventional method to calibrate the system with a reference focal length f₀. Then we calibrate the system with other discrete focal lengths f_i by determining virtual features on a reconstructed white plane using f₀. Finally, we fit the polynomial function model using the discrete calibration results for f_i. Experimental results demonstrate that our proposed method can calibrate the system consistently and accurately.

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