CAMERA AND DIGITAL WATERMARKING SYSTEMS AND METHODS

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 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.