Methods of processing text found in images
An image containing text (e.g., a surveillance camera photo that includes a vehicle license plate) is analyzed to determine the text (e.g., by an OCR technique). The recognized text is then stored in a database. The image is digitally watermarked with an identifier that associates the image with the database location where the text is stored. In addition to surveillance contexts, this technology can be employed in indexing the World Wide Web. Images used in web pages can be watermarked to link to associated text or other data. When the web page is crawled by an indexer, the watermark can be decoded and the associated data repository accessed to obtain information that can augment the web index for that page.
1. A method of augmenting image data collected by a security monitoring camera, comprising:
analyzing a frame of image data from said security monitoring camera for text information depicted therein; and
digitally watermarking said image data;
wherein said digital watermark associates the image data with the text information.
2. The method of claim 1 wherein the frame of image data includes a depiction of a vehicle license plate, and said text information comprises text on said license plate.
3. The method of claim 1 that includes storing said text information in a data repository, and wherein said digital watermark indicates the location of the stored text information in said data repository.
4. The method of claim 1 in which said analyzing comprises performing an OCR process on said depicted text information.
5. The method of claim 1 wherein said digital watermark is essentially imperceptible to human viewers of image data collected by the security monitoring camera.