Patent Document ID: 8712188
Application ID: 13096342

Base Claim:
1. A method of detecting document orientation comprising: capturing a document image; binarizing, by a processor, each subimage of the captured document image; retaining, by the processor, textual content and eliminating graphic and noise content from the captured document image; determining, by the processor, a plurality of values including a text-asymmetry ratio, from strip-based projection profiles of the captured document image, the strip-based projection profiles being non-square and located within a bounding box; detecting, by the processor, portrait or landscape orientation based on the values other than the text-asymmetry ratio; and detecting, by the processor, up or down text orientation based on the text-asymmetry ratio, wherein the portrait or landscape orientation is detected based on the values other than the text-asymmetry ratio in that the text-asymmetry ratio is not used to determine the portrait or landscape orientation.

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Claim 2:
2. A method as in claim 1 , wherein binarizing each subimage comprises: performing Otsu's thresholding algorithm to determine a threshold for binarization; detecting if a subimage is blank; detecting when a subimage includes light text on a dark background; and detecting if a subimage has varying background and foreground.