A new approach is presented to enhance the angular resolution of high-density point light source (HPLS) displays. Some of the lights emitted from the edge of point light sources (PLSs) in a conventional HPLS display do not contribute to the creation of three-dimensional (3D) images. As a result, the 3D images formed at the edges of the display have a low angular resolution. Therefore, our proposed display contains four boundary mirrors that are positioned to utilize these lights. We simulated the angular resolution in the proposed system and experimentally demonstrated the feasibility of the new method. By reflecting the light rays in the mirror that are not used to create the 3D images, we have effectively resolved the issue of low angular resolution in 3D images at the edges of the HPLS display.
A point light source (PLS) display with enhanced viewing angle (VA) is proposed. The maximum VA of a conventional PLS display is equal to the propagation angle of the PLS, so a light-source array (3×3) was used to enlarge the propagation angle of the PLS in the horizontal and vertical directions. The number of converging elemental image points increases due to the large propagation angle of the PLS; thus, the VA of the integrated point was enhanced. From the experimental results, the VA of the proposed method was 2.6 times larger than the maximum VA of a conventional PLS display.
Integral imaging (InIm) is an interesting research area in the three-dimensional (3-D) display technology. While it is simple in structure, it shows full color and full parallax 3-D images without the necessity of special glasses. InIm display usually uses the simplest lens array, and hence displayed 3-D image suffers from distortions. A dominating distortion is a Petzval curvature. To the authors' best knowledge, we have firstly analyzed an effect of the Petzval curvature in InIm display. The immediate consequence of Petzval curvature is that the depth plane of InIm display becomes a curved plane array. Using simulation, the effect of Petzval curvature is found to reduce the depth range, change the viewing direction, and increase the black stripe. The result indicates that the lens array in the InIm display should be customized to reduce these undesirable effects.
KEYWORDS: 3D image processing, 3D displays, Mirrors, Integral imaging, Projection systems, Fresnel lenses, Digital micromirror devices, 3D vision, Diffusers, Image resolution
We propose full-parallax integral imaging display with 360 degree horizontal viewing angle. Two-dimensional (2D)
elemental images are projected by a high-speed DMD projector and integrated into three-dimensional (3D) image by a
lens array. The anamorphic optic system tailors the horizontal and vertical viewing angles of the integrated 3D images in
order to obtain high angular ray density in horizontal direction and large viewing angle in vertical direction. Finally, the
mirror screen that rotates in synchronization with the DMD projector presents the integrated 3D images to desired
direction accordingly. Full-parallax and 360 degree horizontal viewing angle 3D images with both of monocular and
binocular depth cues can be achieved by the proposed method.
We propose a method for generating holograms of real existing 3D objects without coherent optical system. Multiple
orthographic view images of the 3D objects are captured under incoherent illumination and Fourier or Fresnel hologram
is synthesized using captured view images. A lens array is used to capture multiple orthographic view images efficiently.
We also present a method enhancing the phase-only Fourier hologram. By applying the constraints to the orthographic
view images and the generated hologram iteratively, the enhanced phase hologram is obtained.
KEYWORDS: Integral imaging, 3D image processing, Image quality, 3D displays, Image resolution, Binary data, Image processing, Control systems design, Stereoscopy, Visualization
We propose all-in-focus plane reconstruction based on computational integral imaging reconstruction. The depth of the
object is detected by the pixel matching method with proper object mask, and computational integral imaging
reconstruction is performed to get all in focus image. The pixel matching detects the depth of the single plane object by
evaluating the difference between the collected rays. This pixel matching method can be extended to the multiple plane
objects case by the use of the object masking. After each object is identified, the pixel matching is performed to one
object by masking other objects. By repeating this process to all objects, the correct depth of the multiple objects can be
detected. Computational integral imaging reconstruction is performed to all objects with detected depth values, resulting
in all in focus image. From experimental and simulation results, it is confirmed that our
We propose a new synthesis method for the hologram of 3D objects using multiple orthographic view images captured
by lens array. The 3D objects are captured through a lens array under normal incoherent illumination, and their multiple
orthographic view images are generated from the captured image. Each orthographic view image is numerically
overridden by the plane wave propagating at the direction of the corresponding projection angle and integrated into a
single complex value, which constitutes one pixel in the synthesized hologram. By repeating this process for all
orthographic view images, we can generate the Fourier hologram of the 3D objects. Since the proposed method generates
the hologram not from the interference with the reference beam, but from the multiple view images, coherent system is
not required. The manipulation of the 3D information of the objects is also easily achieved in the proposed method. By
manipulating coordinate information of each orthographic view image according corresponding view angle, the depth
order of the reconstructed 3D object can be controlled.
In this paper, we present a floating image system that consists of a stereoscopic display and a two-lens system. A 3-D image is produced inside of the stereoscopic display and that image is projected into the air by the two-lens system. From the experimental results, our proposed system successfully produces the 3-D image, without the distortion and the defects, in midair so that image is a 3-D floating image.
Today, there are many kinds of 3D displays used to produce 3D images but these 3D images are not touchable. Therefore many researchers study how to produce a floating image from 3D image. In floating image display, a large concave mirror or a large lens is used to produce the floating image. However the lens and the concave mirror produce the defected image because magnifications of these two elements are not constant, and an image distance is not linear relationship from an object distance. In this paper we present the stereoscopic floating image system using a stereo display and two lenses. The proposed floating display system provides an impressive feel of depth, and produced image appears to be located in a free space and near the observer. The two-lens system can eliminate all defects of large convex lens because the magnifications are constant and are not related the object distance and the image distance. The experimental result shows that the proposed system successfully makes a touchable stereoscopic floating image.
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