Browsing by Author "Hwang, Hone-Ene"

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Reconstruction of dynamic digital holographic image using Modified Gerchberg-Saxton Algorithm
(2012-01-01)
Huang, Guan-Syun
;
Deng, Qing-Long
;
Chang, Hsuan-Ting
;
Hwang, Hone-Ene
;
Chen, Chien-Yue
The display system of dynamic grayscale holographic movie was projected by using Modified Gerchberg-Saxton Algorithm with the original three-dimensional images. After the analysis of image quality, the output image of visibility was about 0.91 in visual area, the diffraction efficiency was about 54% and the speckle contrast was about 10%.
Speckle reduction by combination of digital filter and optical suppression in a modified Gerchberg-Saxton algorithm computer-generated hologram
(2014-09-20)
Chen, Chien-Yue
;
Deng, Qing-Long
;
Wu, Pei-Jung
;
Lin, Bor-Shyh
;
Chang, Hsuan T.
A speckleless illuminated modified-Gerchberg-Saxton-algorithm-type computer-generated hologram, which adopts a lower frequency of the iterative algorithm and calculation time, is proposed to code a hologram with two signals and position a multiplexing phase-only function, which can reconstruct the left and the right viewing holograms on the pupillary-distance position after the decryption and still maintain the content with high contrast and definition. The reconstructed image quality presents root mean square error of 0.03, with a diffraction efficiency of 87%, and signal-to-noise ratio of 8 dB after the analysis. Furthermore, two denoising techniques for the digital filter and optical suppression are combined, in which the speckle suppression with pseudorandom phase modulation and a rotating diffuser are utilized for successfully reducing the speckle contrast, which was reduced to below 4%. The goal was to reduce visual fatigue for the viewers. (C) 2014 Optical Society of America