Reduction of image discontinuity in coarse integral volumetric imaging.

The authors describe two methods to reduce the discontinuity of the image in coarse integral volumetric imaging. The discontinuity of elemental images from neighboring elemental lenses is smoothed by introducing Fresnel elemental lenses with interleaved grooves. The discontinuity of volumetric layers with long intervals is made indistinct by introducing a smoothing filter and an edge filter to connect the layered images smoothly. The effectiveness of the proposed methods is confirmed by the prototype systems.

Reduction of moiré for coarse integral volumetric imaging.

This paper proposes two moiré reduction methods for coarse integral volumetric displays composed of multilayer display panels. The quality of the image presented by the conventional multilayer integral imaging stays relatively low because of the moiré pattern, which appears due to the layering structure of display panels with limited pixel aperture. The authors propose two methods to solve this problem. The first method is to add another layer of convex lens array with short focal length on the front side of the layered display panels. The second method is to enlarge the pixel pitch of the back-layer panel while fixing that of the front-layer panel.

Integral volumetric imaging using decentered elemental lenses.

This paper proposes a high resolution integral imaging system using a lens array composed of non-uniform decentered elemental lenses. One of the problems of integral imaging is the trade-off relationship between the resolution and the number of views. When the number of views is small, motion parallax becomes strongly discrete to maintain the viewing angle. In order to overcome this trade-off, the proposed method uses the elemental lenses whose size is smaller than that of the elemental images. To keep the images generated by the elemental lenses at constant depth, the lens array is designed so that the optical centers of elemental lenses may be located in the centers of elemental images, not in the centers of elemental lenses. To compensate optical distortion, new image rendering algorithm is developed so that undistorted 3D image may be presented with a non-uniform lens array. The proposed design of lens array can be applied to integral volumetric imaging, where display panels are layered to show volumetric images in the scheme of integral imaging.

Integral volumetric imaging with dual layer fly-eye lenses.

This paper proposes an integral volumetric imaging system that uses a coarse fly-eye lens and a fine fly-eye lens to show smooth and deep 3D image. Conventional integral volumetric imaging displays using a coarse fly-eye lens have suffered from low image quality due to distinct seam of lenses and moiré pattern caused by layered panel structure. To solve these problems the proposed system uses a fine fly-eye lens whose elemental lens has a long focal distance. By placing a fine fly-eye lens near the layered real image, the seam and the moiré are removed while the degradation of the presented 3D image is kept small.