Patent ID: 7755672
Filing Date: 2010-07-13
Classification: H04N

Abstract:
1. A method of modifying data of an image of an object field being electronically captured, comprising: capturing two or more image data sets of the object field with different levels of artificial illumination; generating, from the captured image data sets, illumination correction data that corrects for the artificial illumination being non-uniform across the object field; acquiring an image data set of interest of the object field, where the resolution of the data set of interest is greater than the resolution of at least one of the other two or more image data sets; and applying the illumination correction data set to the image data set of interest to obtain an illumination-corrected image data set of interest, thereby compensating for variations in the intensity across the image field that are attributable to the artificial illumination of the object field, wherein the illumination correction data is based at least in part on a difference between intensity of an image data point of interest from one of the image data sets captured at a first artificial illumination level, and intensity of a corresponding image data point of interest from another of the image data sets captured at a second artificial illumination level, where such difference is further multiplied by a value resulting from dividing one of the first and second artificial illumination level by the other.