The Flipping-Free Tabletop Integral Imaging with Large Viewing Angle Based on Space-Multiplexed Voxel Screen and Compound Lens-Array

Tabletop integral imaging display with a more realistic and immersive experience has always been a hot spot in three dimensional imaging technology, which is widely used in biomedical imaging and visualization to enhance medical analysis and diagnosis. However, the traditional structural characteristics of integral imaging display inevitable introduces flipping effect beyond the viewing angle. To avoid the flipping effect in optical reconstruction, the space-multiplexed voxel screen consisted of projectors array and holographic functional screen is presented to constrain light beams passing through corresponding lens. To further improve the imaging quality in the large viewing angle, the compound lens with two pieces of aspheric lens in each lens unit is optimized to suppress the aberrations, and cooperates with holographic functional screen to recompose the light distribution. The imaging distortion is decreased to less than 9% from more than 30%. In the experiment, the reconstructed full-parallax three dimensional image with the clear displayed depth of 20cm can be perceived with the correct geometric occlusion and smooth parallax in the viewing angle of
$96^{\circ}\times 96^{\circ}$
.