Abstract: Focusing on the problem of copyright protection for engineering drawing and the deficiency of weak robustness of existing correlative algorithms, an information hiding algorithm for engineering drawing based on character dot-matrix code is proposed. To achieve information hiding, the algorithm converts the information to be hidden into dot-matrix code firstly, and then, selects some line entities according to the two-value chaotic sequence generated by Logistic system, and finally conducts a slight modification to the line width of engineering drawing on combination of the HVS and the hidden information. The experiment results show that the proposed algorithm has a better robustness against some attacks such as moving, rotation, scaling and edit of engineering drawing.

Key words: computer application, information hiding, character dot-matrix code, engineering drawing