Electronic correction device for optical distortions in a...

G - Physics – 09 – G

Patent

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G09G 3/00 (2006.01) G06T 5/00 (2006.01)

Patent

CA 2455764

The invention relates to an electronic correction device for optical distortions in a collimation and superimposition lens system where the display is of the matrix type. The invention is based upon generating said corrections in the display by associating each display pixel with the same number of image pixels in each image source for display, the addresses for the pixels of the image sources being calculated from the addresses of the pixels of the display and with application thereto of the function of the optical distortion in the lens system. The calculation of the addresses and the photometric values for the display pixels is carried out in an address calculation unit and an interpolation unit. The invention is essentially for application in head-up visualisation equipment or in helmets used in civil and military aircraft with a matrix display device, particularly with liquid crystals. Said device is equally applicable to monochrome and colour displays.

L'invention concerne un dispositif de correction électronique des distorsions optiques d'une optique de collimation et de superposition d'une visualisation collimatée dans le cas où l'afficheur est de type matriciel. Le principe de l'invention est de réaliser ces corrections au niveau de l'afficheur en associant à chaque pixel de l'afficheur le même nombre de pixels de chaque image-source à afficher, les adresses des pixels des images-sources étant calculées à partir des adresses des pixels de l'afficheur en leur appliquant la fonction de distorsion de l'optique. Le calcul des adresses et des valeurs photométriques des pixels de l'afficheur est réalisé dans une unité de calcul comprenant notamment une unité de calcul d'adresses et une unité d'interpolation. L'invention s'applique essentiellement aux dispositifs de visualisation dits Tête Haute ou de casque utilisés sur aéronefs civils et militaires ayant comme afficheur des dispositifs matriciels notamment à cristaux liquides. Le dispositif s'applique aussi bien aux afficheurs monochromes qu'aux afficheurs couleur.

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