基于点阵式字符编码与实体颜色的工程图密写技术研究

针对数字工程图的版权保护问题和现有密写技术鲁棒性和实用性不强的特点，提出了一种基于点阵式字符编码与实体颜色的工程图密写技术算法。该算法先对要隐藏的信息进行点阵式编码处理，使字符具有图像的特性，然后根据Logistic 混沌系统对该点阵式编码信息进行二值化处理加密，结合HVS 将加密后信息和加密信息的校验码嵌入到工程图的实体颜色中，从而实现信息的隐藏和自校验。实验结果显示该算法对平移、旋转和编辑等攻击具有较好的鲁棒性和较高的嵌入量, 较好地解决了数字工程图的版权保护问题。

Research on steganography based on dot-matrix character code and entitycolor for engineering graphics

Aiming at the problem of copyright protection for digital engineering drawing andthe deficiency of robustness and practicability of the steganography for digital engineeringdrawing, an algorithm of steganography based on dot-matrix character code and entity color forengineering graphics is proposed. In the algorithm of steganography, the hidden message is firstlycoded by dot-matrix, and the character of the message has the image characteristic property. Thenthe coded information is encrypted by a two-value chaotic sequence generated by Logistic mapsystem. To realize the information hiding and self-checking, the encrypted information and itschecksum are embedded into the entity color of engineering drawing combining with the HVS.The experiment results show that the algorithm has a higher embedded capacity and a betterrobustness for some attacking of moving, rotation and edit. And the problem of copyrightprotection for digital engineering drawing is solved in a good way using the algorithm.