12. The method of claim 11 , the generating the clean document age comprising: summing the aligned document images and the selected document image pixel-wise to define a collection of summations, where each of the summations of the collection of summations corresponds to a pixel location; filtering the collection of summations, wherein summations of the collection exceeding a threshold are assigned a black pixel, wherein summations of the collection less than the threshold are assigned a white pixel; and generating the clean document image from the pixels and the pixel locations assigned to the each of the summations of the collection of summations.
12. The method of claim 11 , the generating the clean document age comprising: summing the aligned document images and the selected document image pixel-wise to define a collection of summations, where each of the summations of the collection of summations corresponds to a pixel location; filtering the collection of summations, wherein summations of the collection exceeding a threshold are assigned a black pixel, wherein summations of the collection less than the threshold are assigned a white pixel; and generating the clean document image from the pixels and the pixel locations assigned to the each of the summations of the collection of summations. 13. The method of claim 12 , wherein the summing gives additional weight to at least one of the selected document image and the aligned document images.