Patent ID: 8711275
Filing Date: 2014-04-29
Classification: G02B,G03B,H04N

Abstract:
1. A method for estimating an optical characteristic, comprising: performing a sharpness sweep of a camera lens while capturing, using an image sensor, a plurality of digital images of an object through the lens, wherein the lens is swept in accordance with a plurality of distance-representing values, and the digital images are analyzed to calculate a respective sharpness variable for each of a plurality of different regions of interest in the image sensor; for each of the regions of interest, finding a peak value of the respective sharpness variable and the distance-representing value associated with the peak value; converting pixel coordinates of each region of interest to a pair of distance coordinates, wherein a plurality of triples are created for the plurality of regions of interest, respectively, each triple containing the associated distance-representing value and the pair of distance coordinates; estimating a surface to fit the plurality of triples; and computing a measure of the optical characteristic using the estimated surface, wherein the computed measure comprises a normal vector to the estimated surface.