Realistic Computer Generated Holograms Using ...Using Orthographic Ray-Sampling Plane 2. Calculation...
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RESEARCH POSTER PRESENTATION DESIGN © 2012 www.PosterPresentations.com 1. Introduction Realistic Computer Generated Holograms Using Orthographic Ray-Sampling Plane 2. Calculation of holograms using orthographic ray-sampling plane We propose an efficient CGH calculation method called “orthographic ray-sampling plane method.” Algorithm 1. An intermediate plane is defined near objects. 2. Orthographic images (parallel rays) are captured in various different angles. 3. Orthographic images are Fourier transformed to obtain angular spectra at the ORS plane. 4. Angular spectra are multiplied with transfer function of propagation. 5. Inverse Fourier transform of the result corresponds to the wavefront at the hologram. 3. Experimental Results A hologram of “a stuff of bear and a glass of wine” was calculated using the proposed method. Hologram 105mm × 105mm Distance 140mm ORS Plane 105 × 105 Firstly, orthographic images were rendered from 64 × 64 different angles. Generated fringe pattern was fabricated by a laser- lithography system of “Kan- Dai Digital Holo Studio.” Shunsuke Igarashi 1 , Tomoya Nakamura 1,2 , Kyoji Matsushima 3 , and Masahiro Yamaguchi 1 Hologram ORS Plane Propagation Advantages • Photorealistic appearance of ray-information • High resolution in deep scene due to wave propagation • Efficient calculation of large holograms by omitting redundant propagation 1. Tokyo Institute of Technology, 2. PRESTO Japan Science and Technology Agency, 3. Kansai University 4 . Conclusion Hologram 128 × 128 Pixel pitch 0.8 Viewing angle ±23.3° Rendering time : 5h CGH calculation : 13h Photorealistic material appearance (reflection, refraction, and texture of wool) was successfully reproduced as 3D images. 3DCG Model Objective Computer generated holograms (CGHs) that shows super realistic 3D images (depth cues, photorealistic appearance, etc.) Problems • Computational cost • Resolution in deep scene • Material reproduction We proposed an efficient algorithm to calculate photorealistic and deep scene hologram with large size of display. Photorealistic CGH was calculated and fabricated.
Transcript of Realistic Computer Generated Holograms Using ...Using Orthographic Ray-Sampling Plane 2. Calculation...
RESEARCH POSTER PRESENTATION DESIGN © 2012
www.PosterPresentations.com
1. Introduction
Realistic Computer Generated HologramsUsing Orthographic Ray-Sampling Plane
2. Calculation of holograms using orthographic ray-sampling plane
We propose an efficient CGH calculation method
called “orthographic ray-sampling plane method.”
Algorithm
1. An intermediate plane is defined near objects.
2. Orthographic images (parallel rays) are
captured in various different angles.
3. Orthographic images are Fourier transformed
to obtain angular spectra at the ORS plane.
4. Angular spectra are multiplied with transfer
function of propagation.
5. Inverse Fourier transform of the result
corresponds to the wavefront at the hologram.
3. Experimental Results
A hologram of “a stuff of bear and a glass of
wine” was calculated using the proposed method.
Hologram
105mm × 105mm
Distance
140mmORS Plane
105𝑚𝑚 × 105𝑚𝑚
Firstly, orthographic images were rendered from
64 × 64 different angles.
Generated fringe pattern
was fabricated by a laser-
lithography system of “Kan-
Dai Digital Holo Studio.”
Shunsuke Igarashi1, Tomoya Nakamura1,2, Kyoji Matsushima3, and Masahiro Yamaguchi1
HologramORS Plane
Propagation
Advantages
• Photorealistic appearance of ray-information
• High resolution in deep scene due to wave
propagation
• Efficient calculation of large holograms by
omitting redundant propagation
1. Tokyo Institute of Technology, 2. PRESTO Japan Science and Technology Agency, 3. Kansai University
4. Conclusion
Hologram 128𝐾 × 128𝐾
Pixel pitch 0.8𝜇𝑚
Viewing angle ±23.3°
Rendering time : 5h
CGH calculation : 13h
Photorealistic material
appearance (reflection,
refraction, and texture of
wool) was successfully
reproduced as 3D images.
3DCG Model
Objective
Computer generated holograms (CGHs) that
shows super realistic 3D images (depth cues,
photorealistic appearance, etc.)
Problems
• Computational cost
• Resolution in deep scene
• Material reproduction
We proposed an efficient
algorithm to calculate
photorealistic and deep
scene hologram with large
size of display.
Photorealistic CGH was
calculated and fabricated.
