The disclosure describes an authentication system and related methods for authenticating printed objects. The system uses an information-based metric along with one or more print quality metrics to provide accurate detection or classification of a counterfeit printed object. The print quality metric evaluates attributes of a subject image associated with the original printer, ink or paper to detect degradation of those operations due to copying operations like an image scanning and halftone printing subsequent to the original printing of the object. The information-based metric measures message symbol errors in an optically readable code, such as a digital watermark.

 
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< Data storage medium including optical information carrier

< Pixel for CMOS image sensor having a select shape for low pixel crosstalk

> Optical compensatory sheet having optically anisotropic layer formed from liquid crystal molecules

> Diffractive light modulator-based dynamic equalizer with integrated spectral monitor

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