20. A method for detecting captions in a document that includes text fragments and objects of interest, the method comprising: identifying a caption signature correlative with text fragments that are near at least one object of interest, the caption signature being a value of a text fragment representation comprising at least one text fragment attribute, wherein the identifying includes: assigning a signature to each text fragment of the document, the signature being the value of the text fragment representation for that text fragment, assigning a near property to each text fragment of the document, the near property indicating whether the text fragment is near at least one object of interest, for each signature, determining association scores indicating an extent of association between text fragments assigned that signature and the near property, and identifying one or more caption signatures based on the association scores; and detecting one or more captions as one or more text fragments for which the value of the text fragment representation equals the caption signature.
20. A method for detecting captions in a document that includes text fragments and objects of interest, the method comprising: identifying a caption signature correlative with text fragments that are near at least one object of interest, the caption signature being a value of a text fragment representation comprising at least one text fragment attribute, wherein the identifying includes: assigning a signature to each text fragment of the document, the signature being the value of the text fragment representation for that text fragment, assigning a near property to each text fragment of the document, the near property indicating whether the text fragment is near at least one object of interest, for each signature, determining association scores indicating an extent of association between text fragments assigned that signature and the near property, and identifying one or more caption signatures based on the association scores; and detecting one or more captions as one or more text fragments for which the value of the text fragment representation equals the caption signature. 21. The method as set forth in claim 20 , wherein the text fragment representation comprises at least one text fragment style attribute.