The Shapes of Halftone-AM-Dots Based on Information Hiding

While modern anti-counterfeiting printing technologies usually adopt special ink, laser holographic images, line texture, they need to increase certain supporting printing equipment and the cost. They have such shortcomings as high cost, complex technology, narrow application area and no information hiding, etc. This paper aiming at these problems proposes a kind of information hiding technology based on the shapes of halftone-AM-dot(Amplitude Modulation). The technology combining modern communication modulation technology and information coding technology, chooses anti-counterfeiting information as modulation signal to modulate dot shapes and makes itself carry information in AM screening image process. After plenty of experimental simulation, this method realized the information hiding. It can be used to anti-counterfeiting printing with low cost and excellent performance.