A method of detecting a block-based watermark is provided. The method detects the location of the watermark within a frame of content data regardless of whether the watermark has been shifted or resized....http://www.google.com.au/patents/US6795565?utm_source=gb-gplus-sharePatent US6795565 - Method to detect watermark resistant to resizing and translation
Method to detect watermark resistant to resizing and translation
