Camera, camera accessories for reading digital watermarks, digital watermarking method and systems, and embedding digital watermarks with metallic inks

摘要

The present invention provides a camera and camera housing to improve reading digital watermarks. Another aspect of the invention is a method of authenticating identification documents. The identification document includes a first component. A separate overlay is placed over the identification document. The separate overlay includes a second component. The second component is used to resolve the first component. Still another method determines authenticity of a watermark based on a polarity associated with the watermark. The invention also provides an image capture and processing system and methods for portable devices that increase the image capture functionality of the devices, yet enable a compact mechanical design.