Patent ID: 7408576

Claim:
A method of modifying a digital video signal outputted from an image sensor having a two-dimensional array of individual pixels with an optical field imaged thereon, wherein a sequence of outputs of the individual pixels resulting from said pixels being linearly scanned across the optical field form the video signal, comprising: maintaining image modification data as a function of radial distances of the pixels from a center of the optical field imaged on the sensor, calculating the radial distances of the individual pixels being scanned from their linear position within the two-dimensional array, generating image modifications for the individual pixels being scanned from the image modification data being accessed by the calculated radial distances thereof, and combining the generated image modification data with the outputs of the corresponding individual pixels being scanned, thereby modifying the sequence of outputs of the individual pixels according to the image modification data, wherein maintaining image modification data includes storing points on a continuous curve extending along a radius across the imaged optical field from a center thereof and values of slopes between said points, the continuous curve on which the spherical intensity correction data points lie being defined by an exponential of said radius values.