| http://www.w3.org/ns/prov#value | - The apparatus as claimed in claim 1, wherein the text region detection unit acquires blobs having a same color with the text-background color, analyzes the blobs based on positions and sizes thereof, searches text-background blobs among the blobs, thereby determining the text-background region, and unifies the regions except the text-background region into the text-background color.
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