Author Affiliations
Abstract
1 Digital Holography Research Section, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
2 School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
3 School of Electronics Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
In this paper, we propose a real-time incoherent digital holographic (IDH) recording system free from bias and twin-image noises. A motionless three-step polarization-encoded phase-shifter operating at 99 Hz is realized with two electrically controllable birefringence-mode liquid crystal cells operating in tandem with a geometric phase lens and polarizers. Based on the proposed optical configuration, a coaxial straight-line self-interference IDH recording system is devised. Notably, the elimination of bias and twin-image noise from three phase-shifted images is demonstrated as a proof of concept. Moreover, complex-valued holographic video acquisitions with a resolution greater than 20 megapixels are demonstrated, with an effective acquisition frequency of 33 Hz.
Photonics Research
2023, 11(6): 906
Author Affiliations
Abstract
Graphics processing unit (GPU) based fast calculation method for computer generated spherical hologram (CGSH) of a real-existing object is proposed. Three-dimensional (3D) point cloud is constructed by capturing a real-existing object from multiple directions using a depth camera. The GPU based calculation is used in both hologram generation part and numerical reconstruction part of the CGSH. The improved calculation efficiency is verified by comparing the computation speed between central processing unit (CPU) based and GPU based implementation.
090.0090 Holography 090.1760 Computer holography Chinese Optics Letters
2014, 12(6): 060016
Author Affiliations
Abstract
We introduce a phase-only hologram generation method based on an integral imaging, and propose an enhancement method in representable depth interval. The computational integral imaging reconstruction method is modified based on optical °ow to obtain depth-slice images for the focused objects only. A phase-only hologram for multiple plane images is generated using the iterative Fresnel transform algorithm. In addition, a division method in hologram plane is proposed for enhancement in the representable minimum depth interval.
090.0090 Holography 100.0100 Image processing Chinese Optics Letters
2011, 9(12): 120009
