| http://www.w3.org/ns/prov#value | - This feature is used to determine whether characters are written horizontally or vertically. [0231] When it is determined that the characters are written horizontally (Y at step S55), the CPU 31 extracts rectangles in units of characters in which black pixels are connected in succession (step S56), and extracts character strings for selecting an appropriate reference character string (step S57).
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