KEYWORDS: Holography, Cameras, Stereo holograms, 3D displays, Image fusion, Printing, 3D modeling, Augmented reality, 3D image reconstruction, 3D image processing
Holographic stereogram opens up a new way for holographic 3D display of objects, and has high research value and significance in commercial, military and other aspects. In order to write real and virtual three-dimensional (3D) scenes in holographic stereogram at the same time, so as to achieve the display effect of augmented reality, a light field fusion method is proposed. The basic principle of light field fusion is introduced. The light field sampling is introduced and completed, and depth image based rendering (DIBR) algorithm is applied for regularization and densification of sampled images. The projection relationship of the light rays are analyzed, and the pixel level light field fusion is accomplished. Effective perspectives segmentation and mosaicking (EPISM) holographic stereogram printing method is used to write and reproduce the fused light field which further verifies the effectiveness of the proposed method.
Different light-fields information collection methods will cause different light-fields information cannot be fused and recorded into the holographic stereogram. In order to print the holographic stereogram recording information of virtualreal fusion, the depth-image-based rendering (DIBR) technology is applied to the holographic stereogram fabricated by effective perspective images’ segmentation and mosaicking method (EPISM). This method firstly obtains matching real scene sampling parameters according to the virtual scene, and combines with the improved DIBR technology to draw the initial perspective images without holes or crack problems. After EPISM processing, the synthetic perspective images of real and virtual scenes with the same parameters are fused. Finally, the fused perspective images are recorded into holographic stereogram. The experimental results demonstrate this proposed method obtain high quality virtual-real fusion display.
In this paper, the principle as well as the implementation of EPISM method are introduced firstly. In order to evaluate the reconstruction quality better, the imaging process of EPISM based holographic stereogram is regarded as a general optical system imaging, and modeling and optimization of EPISM method are proposed from two different aspects of angular spectrum and spatial domain. In the analysis of angle spectrum theory, the exit pupil function model is simplified firstly and the optical transfer function (OTF) with defocusing aberrations was established. In spatial domain analysis, the modulation characteristics of the hogel based holographic stereogram is constructed and validated while a diffraction-limited imaging model of the hogel based holographic stereogram is established, and the effective resolvable size of the reconstructed image point is simulated. The theories show that there is an optimal hogel size existed for the certain depth of scene. Optical experiments demonstrate the validity of our analysis, and the optimized parameters of hogel sizes can improve the imaging quality of full parallax holographic stereogram effectively.
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