Methods, systems and apparatus for determining orientation in a document image

摘要

Aspects of the present invention are related to systems, methods and apparatus for determining the orientation of a text line or a page in a document image. According to a first aspect of the present invention, an image of text blobs may be generated from a text mask associated with a document image. From the text-blob image, pixel-wise horizontal differences may be accumulated and compared to accumulated pixel-wise vertical differences. Text line orientation may be determined as horizontal when the accumulated pixel-wise horizontal differences are less than the accumulated pixel-wise vertical differences. According to a second aspect of the present invention, page orientation may be determined by reconciling an estimated text-line orientation with document language information.

主权项

1. A method for determining a line orientation in a document image, said method comprising:
receiving, in a processor, a text mask associated with a document image; generating a text-blob image from said text mask; accumulating pixel-wise horizontal differences of horizontally adjacent pixel intensity values in said text-blob image; accumulating pixel-wise vertical differences of vertically adjacent pixel intensity values in said text-blob image; and selecting a line orientation based on a comparison of said accumulated pixel-wise horizontal differences and said accumulated pixel-wise vertical differences.