#STEREOGRAM HD SIMULATOR#
By tracking all steps from acquisition to recording, the simulator allows for analysis of radial distortions caused by the optical elements used at the recording stage.
#STEREOGRAM HD FULL#
This study presents a simulator which builds a full parallax and full color white light viewable holographic stereogram from the perspective images captured by a virtual recentering camera with its further numerical reconstruction for any viewer location. A holographic stereogram encodes 2D images of a 3D scene that are incoherently captured from multiple perspectives and rearranged before recording. Successful commercialization of holographic printers based on holographic stereograms requires a tool for their numerical replaying and quality assessment before the time-consuming and expensive process of holographic recording. Because the table size is very small, the computing time of SDLUT method can be nearly 80 times faster than that of conventional LUTs in the spatial domain, while the image quality is comparable. In our demonstration, the table size of SDLUT is only 0.44% that of the look-up table (LUT). In the computing of the hogels, the field superposition is conducted in the spectrum domain by using the elemental tables. Because the signal energy always concentrates in a small spectrum region, these regions are cropped as the elemental tables. Subsequently, the fields are Fourier transformed to the spectrum domain. In SDLUT, diffraction fields on the hogel plane of selected reference points in the object space are calculated. Here, we proposed a fast calculation scheme of DA-CGHS by the spectrum-domain look-up table (SDLUT) method. However, its computing cost is extremely high because numerous scenes together with depth information must be calculated. High-definition depth-added computer-generated holographic stereogram (DA-CGHS) is superior in its high quality, easy realization, and auto-shading effect. Thus, a strategy for efficient intensity accumulation is suggested. Finally, there is an upper-quality limit of the reconstructed image by intensity accumulation. In addition, if the computational efficiency is a concern, the CGH calculated with iterations is not recommended for intensity accumulation display. Using this model, we have confirmed that the randomness induced by random phase is equivalent to that induced by random down-sampling for the generation of binary CGHs. In this paper, we propose an empirical formula of the average noise based on the speckle phenomenon in a laser projector. However, there is no simple method to predict the dependence of the average noise and accumulation number, and we can only know the results after finishing the full computation. Intuitively, the quality of the reconstructed image should be proportional to the number of intensity accumulation. If enough randomness is added to the CGHs, the speckle noise can be mostly averaged out. Thanks to the fast frame rate of the binary spatial light modulator, the speckle can be significantly suppressed by intensity accumulation, i.e., the sequential display of multiple CGHs of the same scene. In this report, the authors describe their optical system and the image processing technique which can display a large and bright 3D image, with about 55 degree(s) viewing zone.The image generated by binary computer-generated holograms (CGHs) always suffers from serious speckle noise. In order to enhance the sense of perspective of the reconstructed images and minimize blur of the reconstructed image, an image processing technique is introduced.
#STEREOGRAM HD SERIES#
But in the one-step holographic stereogram, if the series of conventional perspective original images are used without performing any anamorphic image processing, the reconstructed images are observed behind the hologram plane. Reference light is illuminated through this composite lens and the special configuration with cylindrical lenses is considered. The lens is designed as a composite dual lens. One of the important lenses is the long and narrow cylindrical lens with small f-number. One-step holographic stereograms which can reconstruct large images have been produced by an extremely anamorphic optical system. Large one-step holographic stereogram Large one-step holographic stereogram
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