On Tuesdays the USPTO issues new patents. Today's Spotlight Patents address aspects of digital watermarking / fingerprinting. Assigned to Hitachi, the first patent concerns techniques for dynamically detecting image tampering. Assigned to Eastman Kodak, the second patent addresses techniques for dating images from scanned watermarks [I think this is more fingerprinting than watermarking but it's their patent].
8,285,998, "Dynamic image content tamper detecting device and system," assigned to Hitachi Government & Public Corporation System Engineering, Ltd. (JP).
Regularity information such as time codes embedded preliminarily through an electronic watermark is detected from a predetermined number of pieces of continuous frame data of video content through the electronic watermark. In the case where the electronic watermark is not detected from the predetermined number of pieces of continuous frame data, a non-detection count is calculated, and falsification of the predetermined number of pieces of frame data is determined on the basis of the detected regularity information and the non-detection count. Accordingly, falsification such as deletion, addition, and replacement of video content is detected with high accuracy using the electronic watermark.
8,290,205, "Dating images from scanned watermarks," assigned to Eastman Kodak Company.
A method for dating photographic prints comprising scanning a front side of a photographic print forming an image scan; scanning a back side of the photographic print forming a back scan; defining a database of photographic print watermarks, each photographic print watermark comprising a representation of a watermark pattern and an associated date range; analyzing the back scan using a cross-correlation process between the back scan and the watermark patterns in the database of photographic print watermarks to identify a matching photographic print watermark; determining a date range for the image scan responsive to the identified matching photographic print watermark; and associating the determined date range with the image scan.