Method and apparatus for displaying 3D images

摘要

A method and an apparatus for displaying 3D images are disclosed. 2D images are projected from multiple points to a surface with narrow diffusion characteristics, thus it is possible to get a 3D light field with arbitrary angular dependence. According to the invention, the projectors (10) do not target particular screen (12) points. The projectors (10) are directed to the screen (12) with no special positioning, however from the bunch of light beams present, pertaining to the large number of pixels in the projected images, it is possible to select and define a pixel-wise precise 3D light-field through a calibration process. A novel calibration method and device are also described for calibrating 3D display systems, the device being equipped with proper image sensor(s) and a control system.

主权项

1. A method for displaying 3D images comprising the steps of
projecting 2D images by means of multiple projectors (10) onto a diffuser screen (12), the 2D images generating together a 3D light-field (13), wherein 2D views of the 3D light-field (13) are composed of sections of multiple projector (10) images, wherein the diffuser screen (12) comprises a uniform optical structure, and has a diffusion angle (σ) being equal to or larger than the largest angle (α) between optical centers (11) of neighboring projectors (10) as seen from any screen point, the diffuser screen (12) thereby performing a limited diffusion—without changing the main direction of light beams projected onto the screen (12)—to eliminate inhomogeneities resulting from gaps between neighboring projectors (10) and to enable smooth transitions between the 3D images in the 3D light-field (13) when a viewer's position in the 3D light-field (13) changes.