Robust Text Image Watermarking Algorithm Based on Odd-even Quantization

This paper presents the high-capacity blind text watermarking algorithm that is robust to print and scan operations and this method based on the odd-even quantization. First, segment the binary images of Chinese text characters. And the text image is segmented into the embedded part, adjust part, and dislodge part. After segmentation, the quantization function is built on the basis of invariables during printing-scanning. Construct odd-even quantization make sure the number of watermarking embedded. The watermark is embedded through the strategy of flipping pixels at the boundaries of characters. This method exploits human visual masking characteristics to reduce the degree of the text image distortion. Experimental results indicate the watermarking embedded method base on odd-even is robust to common attacks and has good visual effect. The extract of watermarking realized blind detection.