Display of 3D Holoscopic content on ... - Brunel University

ICT Project <strong>3D</strong> VIVANT– Deliverable 6.4
Contract no.:
248420
<strong>Display</strong> <strong>of</strong> <strong>3D</strong> <strong>Holoscopic</strong> Content on
Auto-stereoscopic <strong>Display</strong>
auto-stereoscopic display was designed to <strong>of</strong>fer lenticular lens design creating a variety <strong>of</strong> distinct <strong>3D</strong>
views. The <strong>3D</strong> Auto-stereoscopic display has an embedded hardware that accepts 2D-plus-depth
format and renders 9 views to enable multiple viewers to see <strong>3D</strong> images at any one time.
The display player does not support 9-views <strong>content</strong> as input. However, given that the <strong>3D</strong>
<strong>Holoscopic</strong> <strong>content</strong> is recorded as a single 2D data, then only the 2D input is used. Furthermore it is
necessary to acquire the various parameter <strong>of</strong> the lenticular sheet used by the Philips including the
slanting angle. Three important parameters namely, the focal length and pitch <strong>of</strong> each lenslet and the
slanting angle <strong>of</strong> the lenticular sheet are required by the s<strong>of</strong>tware developed at Brunel University to
computer generate <strong>3D</strong> <strong>Holoscopic</strong> images for the Philips display. Unfortunately it was difficult to
acquire this information from Philips. So we have adapted the information on an earlier version
published by Philips in 1999 for a 7 views <strong>3D</strong> LCD display. A s<strong>of</strong>tware tool has been developed to
map the pixels <strong>of</strong> the 2D intensity distribution <strong>of</strong> a <strong>3D</strong> holoscopic image to fit into a slanted lenticular
structure <strong>of</strong> the Philips display. Unfortunately this [rocedure did not provide satisfactory results due
to
(i) adapting the lenticular optical characteristics from previous development is not
accurate enough and may have caused some <strong>of</strong> the problems;
(ii) Missing information about the lenticular sheet such as the focal length and pitch <strong>of</strong>
each lenslet;
(iii) The display does not accept multiple inputs.
Due to the fact that the auto-stereoscopic Philips display has been discontinued and no longer
commercially available, it was not possible to get access to the necessary information to allow
accurate mapping <strong>of</strong> the <strong>3D</strong> holoscopic image onto the display.
To solve this problem, the Brunel team contacted a number <strong>of</strong> <strong>3D</strong> auto-stereoscopic diplay
manufactures. Alioscopy <strong>3D</strong> Auto-Stereoscopic display is one <strong>of</strong> the systems studied and
experimented with as an example <strong>of</strong> State <strong>of</strong> the art <strong>3D</strong> Auto-Stereoscopic <strong>Display</strong> to ensure the
<strong>3D</strong>VIVANT <strong>content</strong>s (<strong>Holoscopic</strong> <strong>content</strong>) can be replayed on the Alioscopy <strong>3D</strong> <strong>Display</strong>.
4.1 ALIOSCOPY <strong>3D</strong> AUTO-STEREOSCOPIC DISPLAY
The 42-inch <strong>3D</strong> Auto-stereoscopic display is designed to <strong>of</strong>fer lenticular lens design creating 8 <strong>of</strong>
distinct auto-Stereoscopic views. The <strong>3D</strong> Auto-stereoscopic display has a play-back s<strong>of</strong>tware which
accepts Mixed-Content and Mixed-<strong>content</strong> can be generated using Alioscopy Mix & <strong>Display</strong>
Assistant s<strong>of</strong>tware that accepts images from 8 cameras and then it renders 8 images into a single
interlaced-image as shown in Figure 12.
12