24. The reading machine of claim 23 wherein common text between two strings from the pair of images is detected by searching for the longest common subsequence of characters in the strings.
24. The reading machine of claim 23 wherein common text between two strings from the pair of images is detected by searching for the longest common subsequence of characters in the strings. 27. The reading machine of claim 24 wherein the detection of incomplete text comprises: analyze a text string recognized at an edge of one of the images with a grammar checker to determine that the text string is ungrammatical; and produce an indication that the text string corresponds to incomplete text based on determining that the text string was ungrammatical.