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Endoscopy through coherent fiber bundles plays a significant role in industrial and medical imaging. By using a diffractive optical element in form of a diffuser on the distal side, the information of the measurement volume is encoded as 2D speckle patterns on the camera. This allows minimally invasive single-shot 3D imaging through a flexible low-cost endoscope with a diameter of less than 1 mm. Neural networks are employed to get fast image reconstructions from the speckle patterns with high quality. Moreover, multispectral speckle coding is used to increase the amount of transferred information and thus improving imaging capabilities.
Tom Glosemeyer,Yazhi Zheng,Julian Lich,Robert Kuschmierz, andJürgen Czarske
"Multispectral image reconstruction with neural networks for minimally invasive 3D lensless fiber endoscopy using a diffuser", Proc. SPIE PC12136, Unconventional Optical Imaging III, PC121360A (20 May 2022); https://doi.org/10.1117/12.2621196
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Tom Glosemeyer, Yazhi Zheng, Julian Lich, Robert Kuschmierz, Jürgen Czarske, "Multispectral image reconstruction with neural networks for minimally invasive 3D lensless fiber endoscopy using a diffuser," Proc. SPIE PC12136, Unconventional Optical Imaging III, PC121360A (20 May 2022); https://doi.org/10.1117/12.2621196