43. A computer-implemented method for identifying similarly formed paragraphs according to an analysis of paragraph metrics, the computer-implemented method comprising: as implemented by one or more computing devices configured with specific executable instructions, obtaining at least one page image, each page image comprising reflowable textual content; identifying paragraphs of reflowable textual content in the obtained at least one page image; for each identified paragraph, determining a plurality of metrics regarding the identified paragraph; and performing a clustering analysis of the identified paragraphs based on at least one of the plurality of metrics of each paragraph, thereby resulting in at least one cluster of similarly formed paragraphs found on the at least one page image.
43. A computer-implemented method for identifying similarly formed paragraphs according to an analysis of paragraph metrics, the computer-implemented method comprising: as implemented by one or more computing devices configured with specific executable instructions, obtaining at least one page image, each page image comprising reflowable textual content; identifying paragraphs of reflowable textual content in the obtained at least one page image; for each identified paragraph, determining a plurality of metrics regarding the identified paragraph; and performing a clustering analysis of the identified paragraphs based on at least one of the plurality of metrics of each paragraph, thereby resulting in at least one cluster of similarly formed paragraphs found on the at least one page image. 46. The computer-implemented method of claim 43 , wherein determining metrics for each identified paragraph comprises, for each identified paragraph, determining a line height of the paragraph, the line height being the distance between baselines of two consecutive lines of textual content.