Digital Watermarking Methods of Binary Text Image Based on Compatible Rough Set
HU Zhi-hu · Microcomputer Information · 2008
Aiming at the binary text image’s characteristics of simple pixel, complex texture and bad immunity of information con-cealment, a digital watermarking embedment location choosing method has been put forward based upon compatible roughness class. This method divides binary text image into different equivalence classes. Equivalence classes are further divided into different sub-classes according to each pixel’s degree and texture changes between blocks. Through properties’ combination, the embedment block and location which are fit for watermarking are screened out. At last, different binary text images are chosen for emulation experi-ment. When the image is embedded, it is compressed in JPIG-2. Gaussian noise, salt pepper noise and cutting method etc are added to imitate the actual environment in which images might suffer from various attacks and interferences. The result shows that the detector has a sound testing effect under various conditions.