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From document images (Printed horizontally.   Constant space between the lines.  One column.  
Character size (constant height of the lines)), which consist of only characters, such as paperbacked books,
each line should be extracted.  Discuss the processes needed for extracting each line by utilizing 2-D
Fourier Transform.  Here, the processes can deal with the cases in which the  document is translated
vertically (perpendicular to the lines) in the image, and/or in which the document is rotated.
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