Image Number 2 for United States Patent #8059859.
To provide a technique of embedding information in a document image containing character strings, photos, and graphics, an image processing apparatus for inputting a document image and embedding watermark information by controlling the line spacing between character strings in the document image includes an input unit which inputs a document image as image data, an image reduction unit which generates reduced image data from the image data, a determination unit which determines reduced objects corresponding to character strings in the image data, a specifying unit which specifies the position of each character string in the image data based on the positions of the reduced objects in the reduced image data, and an embedding unit which embeds the watermark information in the image data by moving the positions of a plurality of specified character strings in the image data based on a preset line spacing correspondence relationship.
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