Patent ID: 8259179
Filing Date: 2012-09-04
Classification: H04N

Abstract:
1. A method of calibrating an imaging device that uses an illumination source, comprising: illuminating with the illumination source a surface having uniform optical properties thereacross; capturing image data from an image field of the uniform surface as illuminated by the illumination source; generating, from the captured image data, illumination correction data to compensate for illumination variations attributable to the illumination source as a function of position in the image field; storing the illumination correction data in the imaging device; capturing image data of an object image field illuminated by the illumination source, the object image field including an object of interest; retrieving only a portion of the stored illumination correction data that maps directly to a portion of the object image field subtended by the object of interest in an image plane of the imaging device; and combining only the retrieved portion of the illumination correction data with the captured image data of the object image field, to obtain an illumination-corrected object image data set, thereby correcting for variations in the intensity attributable to the illumination source.