Pub. Number US7116781 Appl. Data 09 20010822 Applicant Digimarc Corporation Inventor(s) Rhoads, Geoffrey B. Title Counteracting geometric distortions in watermarking Abstract A digital watermarking method receives multimedia data, such as images or audio, in compressed or uncompressed form, and extracts a digital watermark while counteracting geometric distortions. To counteract geometric distortion, a watermark reading process translates the data before extracting the digital watermark. The reading process operates on compressed data such as JPEG or MPEG images, which are comprised of compressed blocks of image data. If you would like to purchase a copy of this patent, please call MicroPatent at 800-648-6787.