Tuesdays the USPTO issues new patents. Both of today's Spotlight Patents concern aspects of digital watermarking. Assigned to Digimarc, the first patent addresses techniques for on-chip digital watermarking image signals. Assigned to Quiro Holdings, the second patent addresses techniques for client-side watermarking that entail selection of I-frames.
8,457,346, "Digital watermarking image signals on-chip," assigned to Digimarc.
The disclosure describes methods and apparatus for providing digital watermarks or steganographic indicia in image or video data. One implementation embeds digital watermarks on-chip with respect to a CMOS or CCD image array. Some implementations introduce a watermark component during image capture, the watermark being introduced through variations in physical characteristics of a set of pixels. Other implementations are provided and claimed as well.
8,457,349, "Selection of I-frames for client-side watermarking," assigned to Qurio Holdings, Inc.
A system and method are provided for selecting frames of a compressed video stream that may be used for client-side watermarking. In general, a content source evaluates a number of Intra-Frames (I-Frames) in the compressed video stream using a sample watermark that is similar to actual watermarks that may be used for client-side watermarking. More specifically, each of a number of I-Frames in the compressed video stream is evaluated by first watermarking the I-Frame with the sample watermark. Associated frames in the compressed video stream are then decoded using the watermarked I-Frame. An error value for the decoded video frames is then computed. If the error value is outside of a predetermined error threshold range, the I-Frame is selected as an I-Frame that may be used for client-side watermarking.