5/5/2023 0 Comments Complex stereogramThe implementation can proceed with a very small amount of calculation. By adding the contribution of an individual object point, the overall diffraction pattern on the WRP could be achieved. The object wave emitted from each object point covered a small area on the WRP. Different from traditional methods aimed to enhance the generating efficiency of a hologram from an object, the WRP scheme converted the object information into a WRP that was placed closed to the object scene. The wavefront recording plane (WRP) technique was reported to accelerate the calculation of a computer generated hologram (CGH) which based on the ray tracing technique. Algorithms and hardware implementations for fast generation of computer holograms were reviewed. Some effective approaches for accelerating hologram calculation were proposed. Since the hologram is not divided spatially, and each point of the parallax images contributes to the entire hologram, the implementation of the calculation process is time consuming. The complex amplitude of the parallax image should be recorded on the hologram point by point. Since the pixel number of the parallax image is not the same as the hologram, the parallax image cannot be directly converted into 2D wavefronts based on FFTs. Because, the premise of the 2D wavefront calculation based on FFTs is that the pixel number of two 2D planes are the same. Although the parallax images are arranged on the same plane, they cannot be directly converted into two-dimensional (2D) wavefronts based on fast Fourier transforms (FFTs). The holographic stereogram was obtained by adding all of the wavefronts converging to the viewpoints from the parallax images. Recently, a simplified calculation method for computer generated holographic stereograms based on conventional holographic stereograms from multi-view images was reported. A computer generated holographic stereogram is a combination of an optical holographic stereogram with a computer, which can record and reconstruct vivid 3D scenes of both virtual and real objects without requiring a highly stable coherent optical system, which attracted intense attention. Subsequently, computer generated holographic stereograms-based parallax image calculation and diffraction calculation were performed developed. When the hologram film is illuminated by the same reference wave, the area recorded by the parallax image becomes the corresponding viewpoint. Multiple viewpoints projection (MVP) holography and holographic stereograms are two important approaches.įor conventional holographic stereograms, a hologram is divided spatially, and each captured parallax image is coherently recorded on part of the holographic film by moving a mask over the film. Numerous new holographic techniques for the incoherent illuminated three-dimensional (3D) scenes were reported. An extreme stability of the optical system and a powerful, highly coherent laser source is required, which seriously restricts its application outside the laboratory. For traditional optical holography, the holographic recording of a real object is performed by the interference of waves. Holography technology has attracted considerable attentions since it was first reported by Gabor.
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