Digital Watermark Pre-processing Method Research
DU Yao-gang · Journal of Beijing Electronic Science and Technology Institute · 2009
The watermark pre-processing can improve the robustness and other characteristics.The paper introduces the m-sequence,spread-spectrum processing,Arnold Images scrambling,and improves the spread-spectrum processing and image scramble.The improvement makes the data more random,and the space of secret key larger and more security.The paper compares the spread spectrum technology and image scrambling technologies,and concludes that the spread spectrum technology has wider range of application,better randomness,and it improves the watermark robustness.