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.
In this paper, image processing technology is used to simulate the reconstructed images of holographic stereogram in different depth planes. The quality of the reconstructed image of a single hogel at different depths is analyzed firstly. The size of the hogel, the distance between the holographic stereogram and the LCD and the distance between the holographic stereogram and the imaging plane are all factors affecting the quality of the reconstructed image. By dividing the hogel into many sub-parts, the reconstructed images of each sub-parts are analyzed one by one, and by superimposing the reconstructed images of each sub-parts, the reconstructed images of the hogel at different depths can be obtained. Then, the relationship between the reconstructed images of each hogel is analyzed, and the reconstructed images of all hogels are translated and superimposed to obtain the reconstructed images of the holographic stereogram in different depth. The synthetic parallax images generated by using the effective perspective image segmentation and mosaicking (EPISM) algorithm proposed by our group are used to print the holographic stereogram. The experiment results show that the reconstructed images of the stereogram in different depth planes are consistent with the simulation results, which verifies the validation of the simulation.
The problem of the reconstructed of different scene depth was analyzed in single-step holographic stereogram printing based on effective perspective images’ segmentation and mosaicking (EPISM). The reconstructed quality of short scene depth is bad. the causes of flipping effect in holographic stereogram are studied in detail, and the influence of flipping effect on image quality is alleviated by reducing the size of holographic element (Hogel). The curvature distortion of holographic stereogram is analyzed. The effect of curvature distortion on the reconstructed quality of holographic stereogram is verified by changing the distance of object protruding sampling plane. The theoretical analysis was verified experimentally with different scene depth. The reconstructed image of high quality and short scene depth was obtained, and the practicability of EPISM was improved.
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