Multi-user, high-resolution, high-quality directional backlight autostereoscopic display

The invention provides a virtual reality display device, which comprises at least one display and at least one optical module. The display is adapted to provide an image light beam to a left or righteye of a user. The optical module is arranged on a transmission path of the image beam, and is positioned between the display and the left or right eye of the user. The optical module comprises a first Fresnel lens, wherein the first Fresnel lens comprises a plurality of annular structures surrounding an optical axis thereof, each of the annular structures has an effective refracting surface and anon-optical effective surface positioned between the optical axis and the effective refracting surface, and each effective refracting surface is connected with the corresponding non-optical effectivesurface. An average inclination angle of the first Fresnel lens relative to the optical axis on a plurality of non-optical effective surfaces in the central region is smaller than an average inclination angle of the first Fresnel lens relative to the optical axis on a plurality of non-optical effective surfaces in the edge region.

Virtual reality display device

The invention relates to a computer vision and an image processing technology. In order to propose a universal molar grain removing method, the molar grain removing method based on a plurality of pictures of the invention comprises the following steps: step 1, aligning images: converting all images taken on a screen to the same view angle; step 2, selecting a region without or with a slight molarripple to generate a corresponding mask {M1, M2,..., MM}, i.e., the pixel value of the selected region in the image is 1, the pixel value of the other region is 0, and the selected region should haveat least a few pixels overlapped so as to synthesize the whole image in the next step; step 3, image fusion: fusing the respective image regions selected in the previous step into a map IC, the pixelsof the overlapping portion being averaged to mitigate the boundary effect(shown in the specification) where sigma represents the image fusion operation. The invention is mainly applied to image processing occasions.

Moire removing method based on multiple graphs

P‐105: A Directional Backlight Auto‐stereoscopic Display with a LCD as Backlight

The invention provides a method for decreasing Moire fringes in a glasses-free 3D directional backlight system. The method comprises: calculating Moire fringes generated on an LCD (liquid crystal display) screen when a Fresnel lens set and the LCD screen are under different angles, distances and cycle ratios, and drawing a graph; finding Fresnel lens set and LCD screen distance and angle optimal values from a visual contrast distribution graph for Moire fringes generated by Fresnel lens set and the LCD screen periodical information in the glasses-free 3D directional backlight system; constructing the 3D directional backlight system according to the found Fresnel lens set and LCD screen distance and angle optimal values. The method can decease Moire fringes without affecting the visual enjoinment from the glasses-free 3D system, and the quality of visual sensory views can be improved greatly.

Ma Xueyan

Papers

Method for decreasing Moire fringes in glasses-free 3D directional backlight system

Global control of colored moiré pattern in layered optical structures