Patent ID: 9448532
Filing Date: 2016-09-20
CPC Classification: G03H

Claim Text:
1. A method for computing holographic encoding values for an optical light modulator of a holographic system for the reconstruction of three-dimensional scenes, which include objects with transparent properties, for at least one observer eye, comprising: dividing the three-dimensional scene into individual object points and determining the coordinates of these object points, determining a virtual observer position which corresponds with the position of a selected observer eye where the three-dimensional scene is apparently perceived, determining all object points to be encoded which are not fully covered by other opaque object points seen from the virtual observer position as visible real or virtual object points, sorting of all visible object points to be encoded which are seen at the same angle from the virtual observer position by their distance to the virtual observer position, determining the actual brightness of each visible object point, with considering the location and intensity of all real and virtual light sources of the scene at the position of those object points at the angle at which they are seen from the virtual observer position, where the physical properties of the objects including the real and virtual light sources are taken into account, determining for each visible object point to be encoded an apparent brightness value with which the object point is perceived at the virtual observer position, with considering its actual brightness at its actual position, the distance to the virtual observer position and the transparency properties of all objects or object points which are situated between that visible object point and the virtual observer position, determining in addition to the apparent brightness value, for each object point to be encoded, an apparent color value with which the object point is perceived at the virtual observer position considering its actual color value at its position and the transparency properties of all objects or object points which are situated between that visible object point and the virtual observer position, separately computing, for each of the visible object points, the encoding values as a sub-hologram with its respective apparent brightness value and its apparent color value such that it is reconstructed in the holographic system at a position corresponding to a visible point within a reconstruction volume of the hologram system with the apparent brightness value and the apparent color value, so that opaque and transparent object points can be perceived separately at their respective positions, and computing the apparent brightness values and apparent color values of the visible object point with which the object point is perceived at the virtual observer position by considering spatial transparency distributions of the objects or object points which are situated between that object point and the virtual observer position, where their spectral interdependencies can be taken into account.