Method and device for encoding computer-generated holograms...

G - Physics – 03 – H

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G03H 1/08 (2006.01) G03H 1/22 (2006.01)

Patent

CA 2662994

The object is to largely eliminate the errors which arise in the reconstruction of a hologram, calculated point by point, as a result of the encoding of said hologram into pixels of finite extent. The invention achieves the object by means of a method in which the common wavefront calculated from the object sectional planes (6, 7, 8) is multiplied by the inverse transform of the pixel shape and pixel transparency in the viewer's window (11) before the wavefront modified by the multiplication is transformed to the hologram plane (14) and encoded as an amplitude and/or phase distribution of the hologram in the pixels of the light modulator (9, 91). This method is implemented in a corresponding apparatus which contains an additional memory unit for providing a Fourier transform or its inverse Fourier transform and also a multiplication unit.

L'objectif de l'invention consiste à supprimer en détails les erreurs survenant lors de la reconstruction d'un hologramme à travers le codage de l'hologramme évalué ponctuellement en pixels avec extension finie. À cet effet, un procédé permet de multiplier le front d'onde commun évalué à partir des plans de coupe de l'objet (6, 7, 8) dans la fenêtre de visionneuse (11), par la transformée inverse de forme de pixels et de transparence de pixels, avant que le front d'onde modifié par la multiplication ne soit transformé dans le plan d'hologramme (14) et codé en tant que répartition d'amplitude et/ou de phase de l'hologramme en pixels du modulateur de lumière (9, 91). Ce procédé est réalisé dans un dispositif correspondant contenant une unité de stockage supplémentaire pour fournir une transformée de Fourier et/ou sa transformée de Fourier inverse ainsi qu'une unité de multiplication.

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