Author details

finer sampling were merged into a single step in the algorithm ACPAS [57] which yielded quality of reconstruction very close to the reference model. The best results are provided by the FPAS algorithm which is characterized with better phase compensation than the previous methods. This was confirmed by quality assessment with conventional image-based objective metrics as intensity distribution and peak signal-to-noise ratio [75] for reconstruction of a single point and also by good quality of reconstruction from white-light viewable colour holograms (Figure 10) printed by our wavefront printing system [73] on an extra-fine grain silverhalide emulsion Ultimate08 [78]. The CGH computed by the FPAS algorithm for each elemental hologram was displayed on an amplitude type SLM. The demagnified pixel interval was 0.42 μm at the plane of the hologram and gives a diffraction angle of 39.3°. For uniform illumination of the CGH on the SLM without decreasing too much the laser beam intensity we

Figure 10. Photographs of reconstruction from printed holograms: (a)–(c): different views of a church model; (d): 9 cm

hologram became equal to 0.38 mm by 0.38 mm. The printed holograms are shown in Figure 10;

elemental holograms. The segment size for calculating the CGH fed to a given elemental

Holographic imaging is a 3D imaging with all depth cues and inherent vision comfort for the viewer. That is why the last decade was marked by rapid development of methods of 3D capture and 3D content generation for holographic display, holographic projection and holographic printing. In the chapter, we considered implementation of the holographic imaging by digital means when the input data are in the form of a 2D real-valued matrix, which should encode the light wavefront coming from the 3D scene. This wavefront can be extracted from optically recorded holograms or synthesized numerically using various 3D scene descriptions. Holographic recording by digital photo-sensors or computer generation of holograms for pixelated SLMs imposes severe limitations on the space-bandwidth product of the capture/display system. We discussed two cases of data mapping from holographic capture to holographic display to

32 pixels while the FFT computation area was 128

+

852 pixels in the SLM to project CGHs. Thus, the size of the elemental

9 cm. The smaller hologram consisted of 131

+

+131

+9 cm

128 pixels, and each

used only 852

their size is 5 cm

hologram was 32

4. Conclusion

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printed hologram of a bunch of flowers.

196 Holographic Materials and Optical Systems

+

+

5 cm and 9 cm

elemental hologram comprised more than 700 segments.

Elena Stoykova1 \*, Hoonjong Kang<sup>2</sup> , Youngmin Kim2 , Joosup Park<sup>2</sup> , Sunghee Hong<sup>2</sup> and Jisoo Hong

\*Address all correspondence to: elena.stoykova@gmail.com

1 Institute of Optical Materials and Technologies to Bulgarian Academy of Sciences, Sofia, Bulgaria

2 VR/AR Research Center, Korea Electronics Technology Institute, Mapo-gu, Seoul, Korea
