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In this paper, a method of color curved hologram calculation based on angle multiplexing is proposed. The relationship between the wavelength, center angle and sampling interval of the curved holograms is analyzed for the first time by analyzing the reconstruction process of the curved holograms with different wavelengths. Based on this relationship, the color curved holograms are calculated by compensating phase to the complex amplitude distribution of the planar holograms. To eliminate the chromatic aberration, the curved holograms of different objects with the same color channel are respectively used for angle multiplexing and phase compensation, and then the color composed curved hologram is generated. Different color objects without chromatic aberration can be reconstructed by bending the composed curved hologram into different central angles. The experimental results verify the feasibility of the proposed method. Besides, the application of the proposed method in augmented reality display is also shown.
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http://dx.doi.org/10.1364/OE.451186 | DOI Listing |
Projecting images onto arbitrary curved surfaces is a sought-after goal in computer-generated holography applications. However, achieving high axial resolution with a low level of cross-talk using a single computer-generated hologram is still challenging. Here we propose and demonstrate a new type of holographic technique that projects conformal images onto two-dimensional arbitrarily shaped curved sheets oriented perpendicular to the display.
View Article and Find Full Text PDFAs one of the most promising augmented reality solutions, waveguide display has attracted widespread attention in recent years. However, most existing research and commercial products are limited to the planar waveguide scheme. Here, we propose a curved waveguide scheme using freeform polarization volume holograms (F-PVHs) as couplers.
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October 2024
Rendering techniques are important in computer-generated holograms (CGHs) for expressing various types of holo-realistic 3D images. Rendering techniques such as hidden surface removal and reflection by a planar mirror have been proposed thus far, but reflection on a curved mirror surface has yet to be achieved. In this study, we propose a calculation algorithm that can express the reflection of the surrounding environment on a mirror surface defined as a Bézier surface.
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February 2023
A horopter screen has been popularly studied since its curvature reduces the parallax between two eyes and the immersive displays with a horopter-curved screen are regarded to provide vivid impression of depth and stereopsis. But, the projection on a horopter screen causes some practical problems that the image is hard to be focused on the entire screen and its magnification is partially different. An aberration-free warp projection has a great potential to solve these problems, which changes the optical path from an object plane to an image plane.
View Article and Find Full Text PDFIn this paper, a method of color curved hologram calculation based on angle multiplexing is proposed. The relationship between the wavelength, center angle and sampling interval of the curved holograms is analyzed for the first time by analyzing the reconstruction process of the curved holograms with different wavelengths. Based on this relationship, the color curved holograms are calculated by compensating phase to the complex amplitude distribution of the planar holograms.
View Article and Find Full Text PDF