Yoshiharu Momonoi

Effect of light ray overlap between neighboring parallax images in autostereoscopic 3D displays

A display system with lens arrays at the front of a high-resolution LCD has been known as a method to realize an autostereoscopic three-dimensional (3D) display. In these displays, a light ray overlap between neighboring parallax images affects the image quality. In this study, the overlap effects were investigated for the one-dimensional (horizontal parallax only) integral imaging (1D-II) method. We fabricated samples of 1D-II displays with different levels of light ray overlaps and evaluated the 3D image by subjective assessment. It is found that the 1D-II display utilizing the proper parallax overlaps can eliminate banding artifact and have good 3D image quality within the wide range of a viewing area.

Scan-type image capturing system using a cylindrical lens for one-dimensional integral imaging

We propose a new capturing system to realize capture of elemental images for an autostereoscopic display based on a one-dimensional integral imaging (1D-II) method. In order to realize a capturing system for the 1D-II display, capturing elemental images with fine pith and containing much horizontal parallax information with wide angle are important. The optical system composed of a cylindrical lens, a focusing lens and an imaging device can capture elemental images having these two features with scanning over an object. Furthermore, the system size can be small by adapting a compact scanning optical system of a copy machine. We captured 200 elemental images at a fine scan pitch of 0.5 mm. There were 92 horizontal pixels on each elemental image. The number of horizontal pixels correspond the number of parallaxes. The angle range of the captured parallaxes was 42 degrees. Using the autostereoscopic display based on the 1D-II method, the synthesized image can be observed to be a correct three-dimensional (3-D) image.

Birds-eye view ray scan system for flatbed autostereoscopic displays

We have proposed a flatbed autostereoscopic display using the one-dimensional (1-D) integral imaging (II) method [Hirayama 2006]. 1-D cylindrical lens array (lenticular sheet) is used in the 1D-II display, making it possible to observe a three-dimensional (3-D) image with the horizontal parallax ray. The flatbed autostereoscopic display system brought about a more effective stereoscopic experience than the conventional upright display. In the flatbed display configuration, observers perceive displayed objects as if they exist on a table, because it has real depth matching with a horizontal plane and uses birds-eye view configuration.