A novel vision-based scheme to levelness estimation of DLP projector

Feng Yang; Lidong Zhao; Zening Men; Zhi Zhao; Lifang Wu

doi:10.1117/12.2680165

27 June 2023 A novel vision-based scheme to levelness estimation of DLP projector

Feng Yang, Lidong Zhao, Zening Men, Zhi Zhao, Lifang Wu

Proceedings Volume 12705, Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022); 1270536 (2023) https://doi.org/10.1117/12.2680165
Event: Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022), 2022, Nanjing, China

Abstract

Digital Light Processing (DLP) 3D printing is implemented by projecting the image of the slice of the model on the exposure surface, and the projected image's accuracy will influence the printed object's quality. It is necessary to maintain the accuracy of the projected image. A prerequisite for high-precision printing is that the projector is horizontal. The existing methods calibrate the levelness of the projector by observing the level meter; the calibration precision cannot be guaranteed. In this paper, a vision-based scheme is proposed to evaluate the levelness of a projector and to estimate the rotation angles. Firstly, the hardware is designed to capture the projected image on the exposure surface. A pixel in the projected image is about 74*74 pixels in the captured image. Secondly, the possible variation of pixel relation in different situations is analyzed in theory. Then, the variation of pixel distance (or slope) by tilt angle is further analyzed. The corresponding variation curves are obtained by curve fitting. Finally, based on the corresponding curves, the tilt direction and angle of the projector can be estimated from the captured image. The experimental results demonstrate that the average error of the estimated tilt angle is smaller than 0.2 degrees.

Citation Download Citation

Feng Yang, Lidong Zhao, Zening Men, Zhi Zhao, and Lifang Wu "A novel vision-based scheme to levelness estimation of DLP projector", Proc. SPIE 12705, Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022), 1270536 (27 June 2023); https://doi.org/10.1117/12.2680165

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KEYWORDS

Projection systems

Image analysis

Printing

Digital Light Processing

Cameras

Image processing

3D printing

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