Patent ID: 7423673

Claim:
System for determining a distortion model for an optically distorting medium, the system comprising: a first image sensor located at a first image acquisition position behind said optically distorting medium, said first image sensor acquiring a first obstructed image of an object located substantially at infinity, when said optically distorting medium is located between said first image sensor and said object in a line of sight connecting said first image sensor and said object, said first image sensor acquiring an unobstructed image of said object, when said optically distorting medium is absent from said line of sight; and an image processor coupled with said first image sensor, said image processor receiving information respective of said first obstructed image and said unobstructed image from said first image sensor, said image processor identifying a plurality of first features in said unobstructed image, and a respective first feature in said first obstructed image for each of said identified first features in said unobstructed image, thereby determining pairs of associated features, said image processor determining a first distortion parameter for each of said pairs of associated features, said image processor determining a reference distortion model for said optically distorting medium, respective of said first image acquisition position, according to said first distortion parameters.