Systems and methods for registration of hemispheric images...

G - Physics – 06 – T

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G06T 7/00 (2006.01)

Patent

CA 2431214

Systems and methods for registering hemispheric images obtained using a fisheye lens for panoramic viewing, relating to spatial alignment and colour balancing of complement half-side images derived from the hemispheric images. The systems and methods for spatial alignment determine the displacement of the digitized recorded images using a single translation and rotation model of distortion, which further evaluates the centre of projection, and the extent of translation and rotation. The system and method for colour balancing iteratively increase (or decrease) the values of pixels near the edge (discontinuity) between the two half-sides of an image, each time taking into consideration the average difference of pixel colour across a smaller strip of the edge near the pixel. This invention removes the colour differential but does not remove any detail underlying the features of the image.

L'invention concerne des système et des procédés d'enregistrement d'images hémisphériques obtenues au moyen d'un oeil-de-poisson destinée à un visionnement panoramique, permettant un alignement spatial et un équilibrage des couleurs de demi-images latérales complémentaires dérivées des images hémisphériques. Ces systèmes et ces procédés permettant un alignement spatial déterminent le déplacement des images enregistrées numérisées au moyen d'une translation unique et d'un modèle de rotation de distorsion, qui permet aussi d'évaluer le centre de projection, et l'étendue de la translation et de la rotation. Le système et le procédé permettant l'équilibrage des couleurs augmentent (ou diminuent) de façon itérative les valeurs de pixels à proximité (de la discontinuité) du bord entre les deux demi-images latérales d'une image, prenant à chaque fois en considération la différence moyenne de couleur de pixel à travers une bande plus petite de bord à proximité du pixel. Cette invention permet d'éliminer le différentiel de couleur, mais ne permet pas d'éliminer les détails soulignant les caractéristiques de l'image.

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