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Design and development of an effective optical-variable-device-based security system incorporating additional synergistic security technologies
Classifying digital prints according to their production process using image analysis and artificial neural networks
CPLgram: an advanced machine-readable OVD that is obtained by combining diffraction gratings and liquid crystals
Development and applications of diffractive optical security devices for banknotes and high value documents
Apparatus and method for making a security hologram with multi-images in different viewing direction on a small area