We developed special calibration and stitching algorithms in order to combine the individual image data of each camera of the multi camera array to one single, geometrical distortion free, homogeneous and brightness normalized image. This is achieved by a special calibration process together with our calibration ruler tool which can be used as one-tool-for-all our scanning products.
The result of the calibration process is a look-up-table (LUT) containing a correction matrix for each pixel in the field-of-view of each camera. The illumination inhomogeneity is corrected by our flat- field-correction algorithm which is part of the calibration process. The resulting LUT is used to correct brightness and color inhomogeneity caused by lens tolerances and illumination variations.