To capture the three-dimensional (3D) information of microscopic (micro) object, the light field microscopy (LFM) has been studied. A lens array is inserted into the conventional microscope and 3D information of micro object is captured in single shot. However, since the lateral resolution decreases severely because of lens array, the integral floating microscopy (IFM) is proposed. The IFM is modified version of the LFM which concentrates on the lateral resolution rather than the angular resolution by changing the location of specimen and the lens array. The specimen should be located at the front focal plane and the lens array should be located at the back focal plane of the objective lens in the IFM but it is hard to locate the lens array into the back focal length of the objective lens because the back focal length lies in the barrel of the objective lens in general. In this paper, we propose the modified version of the integral floating microscopy which can place the lens array at the optimum position. The structure of the whole system is changed and the relay lens is added to relay the back focal length outside. By placing the lens array at the optimum position, the captured information could be maximized, and by changing the focal length of the relay lens, the field of view (FOV) mismatch problem can be also mitigated. The relationship between the captured information and the specification of the system is analyzed and proper experiments are presented for the verification.
KEYWORDS: Cameras, Integral imaging, Imaging systems, 3D displays, 3D image processing, Image sensors, Charge-coupled devices, LCDs, 3D visualizations, Associative arrays
Our objective is to construct real-time pickup and display in integral imaging system with handheld light field camera. A micro lens array and high frame rate charge-coupled device (CCD) are used to implement handheld light field camera, and a simple lens array and a liquid crystal (LC) display panel are used to reconstruct three-dimensional (3D) images in real-time. Handheld light field camera is implemented by adding the micro lens array on CCD sensor. Main lens, which is mounted on CCD sensor, is used to capture the scene. To make the elemental image in real-time, pixel mapping algorithm is applied. With this algorithm, not only pseudoscopic problem can be solved, but also user can change the depth plane of the displayed 3D images in real-time. For real-time high quality 3D video generation, a high resolution and high frame rate CCD and LC display panel are used in proposed system. Experiment and simulation results are presented to verify our proposed system. As a result, 3D image is captured and reconstructed in real-time through integral imaging system.
KEYWORDS: Holograms, Wavefronts, 3D image reconstruction, Digital holography, Holography, Charge-coupled devices, Image processing, Interferometry, Near field optics, Wave propagation
We propose a digital hologram generation method from diffracted intensity images based on the transport of intensity
equation. In this paper we do experiment to verify the proposed method with coherent illumination with simple
experiment setup using the intensity images capture process. The experiment results show that our proposed method has
advantages compared to both the conventional holography with interferometry and the hologram generation based on
multiple intensity images.
KEYWORDS: Polarizers, Scattering, Light scattering, 3D image processing, Polarization, 3D displays, Linear polarizers, Projection systems, Integral imaging, 3D volumetric displays
A bi-directional 2D/3D convertible integral imaging system is proposed. Two optical modules composed of a scattering
polarizer and a linear polarizer are adopted, and 2D or 3D mode operation is easily changed by converting polarization
states of the projected images. In the 2D mode, the incident light is scattered at the scattering polarizer and the scattered
light facing the lens-array is blocked, a 2D image is observable only at the same side as the projector. In the 3D mode,
the incident light with the transmission polarization is directly projected onto a lens-array, and the 3D images are
integrated. Our proposed system is able to display the 3D images as well as the 2D images for the observers who are
placed in front and rear side of the system.
KEYWORDS: 3D image reconstruction, 3D image processing, 3D displays, Lenticular lenses, RGB color model, Error analysis, Integral imaging, Image analysis, Lenses, Distortion
In three-dimensional (3D) display based on lenticular lens method, the focal mode in which the gap between lens and
display panel is almost equal to the focal length is widely used nowadays. However, because each pixel of the display
panel has a finite size, reconstructed 3D image is displayed in virtual mode instead of focal mode. Because the elemental
image which is a source of reconstructed image was generated for focal mode, the 3D image could suffer from image
distortion. In this paper, view image error analysis based on autostereoscopic lenticular lens method and integral imaging
method is presented based on numerical analysis and simulation results.
The amount of information for 3D display is much bigger than that for 2D display. Therefore, many researches about 3D
display have used multiplexing of conventional display devices sequentially or spatially. We propose a new 3D display
system using a concave cylindrical mirror and tracking technology. The concave cylindrical mirror can be used like a
convex lens in the polar axis. It means that the concave cylindrical mirror can float an image from a 2D display panel
and give directional images to a viewer in the optical axis. To give the parallax to the viewer, the tracking technology
will be used to generate the images according to the position of the viewer. We design a structure with a cylindrical
reflective film and a 2D display panel. And, we use the tracking technology to provide parallax which cannot be made in
the cylindrical reflective film. Further explanations of the proposed structure and experimental results will be presented.
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