Augmented reality (AR) technology is a hot topic research field in recent years. It combines the real world scene and virtual 2D or 3D images. We propose two AR 3D display systems based on integral imaging (II) by using a micro-lens array holographic optical elements (HOE). In the first AR display system, we realize a dual-view-zone 3D display based on angle multiplexing technology. In recording process, two parallel beams with different incident angles illuminate a micro lens array (MLA) to form two sets of inclined spherical wave arrays, and another parallel beam illuminates the opposite side of the photopolymer. After exposure, the MLA-HOE is fabricated. In reconstruction process, only the Bragg matched light can be diffracted, while the Bragg mismatch light transmits through the HOE directly. Thus, when a projector beam satisfies the Bragg match condition, two inclined spherical wave arrays with the different diffraction directions will be rebuilt to realize the dual-view-zone AR 3D display. In the second AR display system, we improve the resolution of the AR 3D display by using a lenticular lens array HOE. In this system, we use a divergent light as the reference beam to simplify the display system and enlarge the display size of the HOE. The AR 3D display system has enhanced resolution and is compact.
KEYWORDS: 3D displays, 3D image processing, Augmented reality, Integral imaging, Holographic optical elements, 3D image reconstruction, Visualization, Projection systems, Glasses, Imaging systems
Integral imaging (II) is a good candidate for augmented reality (AR) display, since it provides various physiological depth cues so that viewers can freely change the accommodation and convergence between the virtual three-dimensional (3D) images and the real-world scene without feeling any visual discomfort. We propose two AR 3D display systems based on the theory of II. In the first AR system, a micro II display unit reconstructs a micro 3D image, and the mciro-3D image is magnified by a convex lens. The lateral and depth distortions of the magnified 3D image are analyzed and resolved by the pitch scaling and depth scaling. The magnified 3D image and real 3D scene are overlapped by using a half-mirror to realize AR 3D display. The second AR system uses a micro-lens array holographic optical element (HOE) as an image combiner. The HOE is a volume holographic grating which functions as a micro-lens array for the Bragg-matched light, and as a transparent glass for Bragg mismatched light. A reference beam can reproduce a virtual 3D image from one side and a reference beam with conjugated phase can reproduce the second 3D image from other side of the micro-lens array HOE, which presents double-sided 3D display feature.
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