KEYWORDS: Cameras, Image acquisition, 3D modeling, 3D acquisition, 3D displays, Integral imaging, Image processing, Deep learning, 3D image processing, Digital cameras
In this report, we proposed an advanced integral imaging 3D display system using a simplified high-resolution light field image acquisition method. A simplified light field image acquisition method consists of a minimized number of cameras (three cameras placed along the vertical axis) to acquire the high-resolution perspectives of a full-parallax light field image. Since the number of cameras is minimized, the number of perspectives (3×N) and the specifications of the 3D integral imaging display unit (N×N elemental lenses) cannot be matched. It is possible to utilize the additional intermediate-view elemental image generation method in the vertical axis; however, the generation of the vertical viewpoints as many as the number of elemental lenses is a quite complex process and requires huge computation/long processing time. Therefore, in this case, we use a pre-trained deep learning model, in order to generate the intermediate information between the vertical viewpoints. Here, the corrected perspectives are inputted into a custom-trained deep learning model, and a deep learning model analyzes and renders the remaining intermediate viewpoints along the vertical axis, 3×N → N×N. The elemental image array is generated from the newly generated N×N perspectives via the pixel rearrangement method; finally, the full-parallax and natural-view 3D visualization of the real-world object is displayed on the integral imaging 3D display unit.
In this paper, A full-color Denisyuk-type hologram using photopolymer has been recorded by the sequential exposure method. The photopolymer's optical characteristics show that inhibition periods of the photopolymer at three lasers are different in the same beam intensity. To increase the average diffraction efficiency of a full-color holographic optical element (HOE), the three lasers should be sequentially exposed to the photopolymer. The experimental results show that the average efficiency of a full-color reflection HOE is 59.6% and the standard deviation is 2.1. Also, the full-color hologram recorded in a one-layer photopolymer can reconstruct a high-quality image.
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