Generation of image for an autostereoscopic display

An autostereoscopic display comprising:

• a display arrangement, the display arrangement comprising a display panel and a view forming optical element wherein the view forming arrangement is arranged to project the display image in a plurality of view cones;
• a source apparatus arranged to provide a three dimensional representation of a scene;
• a generator circuit arranged to generate the display image from the three dimensional representation of the scene, wherein the generator circuit is arranged to
• determine a scene view point direction indication reflecting a view point direction for the scene in response to a direction mapping function and a view cone projection direction indication,
• wherein the view cone projection direction indication reflects a projection direction for at least one pixel of the display image within the view cones,
• wherein the direction mapping function reflects a relationship between view cone projection directions and scene view point directions;
• and
• determine a pixel value corresponding to the view point direction from the three dimensional representation for the at least one pixel of the display image;
• a processor circuit arranged to determine a viewer characteristic indicative of a number of current viewers;
• and
• an adapter circuit is arranged to adapt the direction mapping function in response to the viewer characteristic;
• wherein the adapter circuit is arranged to adapt the direction mapping function to reduce at least one of a scene view point direction deviation and a magnitude of a derivative of the direction mapping function for at least one view cone projection directions in response to the viewer characteristic
• wherein the viewer characteristic is indicative of an increasing number of current viewers,
• wherein the scene view point direction deviation reflecting a deviation from a scene view point direction corresponds to a central view cone projection direction.

A method for generating a display image for a display panel of an autostereoscopic display, the autostereoscopic display comprising a display arrangement comprising the display panel and a view forming optical element;

• the method comprising:
• providing a three dimensional representation of a scene;
• generating for at least one of the pixel(s) the display image from the three dimensional representation of the scene, the generating comprising:
• determining a scene view point direction indication reflecting a view point direction for the scene in response to a direction mapping function and a view cone projection direction indication,
• wherein the view cone projection direction indication reflects a projection direction for the at least one pixel(s) of the display image within the view cones,
• wherein the direction mapping function reflects a relationship between view cone projection directions and scene view point directions;
• and
• determining a pixel value corresponding to the view point direction from the three dimensional representation for the at least one pixel(s) of the display image;
• determining a viewer characteristic indicative of a number of current viewers;
• and
• adapting the direction mapping function in response to the viewer characteristic;
• the adapting including adapting the direction mapping function to reduce at least one of a scene view point direction deviation and a magnitude of a derivative of the direction mapping function for at least one view cone projection directions in response to the viewer characteristic,
• wherein the viewer characteristic is indicative of an increasing number of current viewers,
• wherein the scene view point direction deviation reflecting a deviation from a scene view point direction corresponds to a central view cone projection direction,
• wherein the view forming optical element is arranged to project the display image in a plurality of view cones.