Electro-holography display using computer generated hologram of 3D objects based on projection spectra

Sujuan Huang; Duocheng Wang; Chao He

doi:10.1117/12.1000060

26 November 2012 Electro-holography display using computer generated hologram of 3D objects based on projection spectra

Sujuan Huang, Duocheng Wang, Chao He

Proceedings Volume 8556, Holography, Diffractive Optics, and Applications V; 85561M (2012) https://doi.org/10.1117/12.1000060
Event: Photonics Asia, 2012, Beijing, China

Abstract

A new method of synthesizing computer-generated hologram of three-dimensional (3D) objects is proposed from their projection images. A series of projection images of 3D objects are recorded with one-dimensional azimuth scanning. According to the principles of paraboloid of revolution in 3D Fourier space and 3D central slice theorem, spectra information of 3D objects can be gathered from their projection images. Considering quantization error of horizontal and vertical directions, the spectrum information from each projection image is efficiently extracted in double circle and four circles shape, to enhance the utilization of projection spectra. Then spectra information of 3D objects from all projection images is encoded into computer-generated hologram based on Fourier transform using conjugate-symmetric extension. The hologram includes 3D information of objects. Experimental results for numerical reconstruction of the CGH at different distance validate the proposed methods and show its good performance. Electro-holographic reconstruction can be realized by using an electronic addressing reflective liquid-crystal display (LCD) spatial light modulator. The CGH from the computer is loaded onto the LCD. By illuminating a reference light from a laser source to the LCD, the amplitude and phase information included in the CGH will be reconstructed due to the diffraction of the light modulated by the LCD.

Citation Download Citation

Sujuan Huang, Duocheng Wang, and Chao He "Electro-holography display using computer generated hologram of 3D objects based on projection spectra", Proc. SPIE 8556, Holography, Diffractive Optics, and Applications V, 85561M (26 November 2012); https://doi.org/10.1117/12.1000060

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KEYWORDS

Computer generated holography

3D image processing

LCDs

Holograms

Quantization

3D displays

Fourier transforms

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