scholarly journals Partially Overlapping Printing with Digital Filter to Improve Quality of Volume Hologram Printer – Numerical Simulation –

2020 ◽  
Vol 10 (11) ◽  
pp. 3963
Author(s):  
Hangbo Hua ◽  
Takeshi Yamaguchi ◽  
Hiroshi Yoshikawa

The volume hologram printer is useful for 3D display, because it is selective to the wavelength and be able to reconstruct with the natural illumination. There are many studies of a volume hologram printer been studied to output a volume hologram from a computer-generated hologram. The final volume hologram consists of tiled small holograms and the tiling manner often causes spilt lines which will have impact on image quality. With an intent to get rid of the split lines and improve the quality, fully overlapping printing was proposed recently. Each elemental hologram is overlapped both in vertical and horizontal directions by 50%. Then, the hologram is printed four times in each area and it makes the printing speed four times slower. For this case, partially overlapping printing is proposed in this paper to improve image quality with small effect in printing speed. For partial overlapping, a digital spatial filter is projected and added to every elemental hologram. Using the digital spatial filter, different partially overlapped holograms are calculated and reconstructed to compare to the non-overlapped ones. The simulation result shows that the overlapped one (10% in both vertical and horizontal) has much weaker gaps and black lines.

2014 ◽  
Vol 45 (1) ◽  
pp. 1149-1152
Author(s):  
Masaaki Kabe ◽  
Toshiyuki Nagatsuma ◽  
Amane Higashi ◽  
Tae Nakahara ◽  
Kojiro Ikeda ◽  
...  

2012 ◽  
Vol 7 (01) ◽  
pp. E01001-E01001
Author(s):  
J G Park ◽  
H Seo ◽  
C H Kim ◽  
S H Jung ◽  
J B Kim ◽  
...  

2012 ◽  
Vol 538-541 ◽  
pp. 2032-2037
Author(s):  
Xin Xia Qi ◽  
Jia Qi

Using simulating and field experiment to analyze the influence of secondary cooling scheme for wide slab on the quality of blank, to find the theory for quality defect, develop new methods for better qualityblank, and try to make a way to improve quality level of blank.


2020 ◽  
Vol 46 (1) ◽  
pp. 1
Author(s):  
Kaushik Basak Chowdhury ◽  
Maximilian Bader ◽  
Christoph Dehner ◽  
Dominik Jüstel ◽  
Vasilis Ntziachristos

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