Print-scan Invariant Multi-contour Pixel Flipping Text Image Watermark Algorithm

Abstract

Based on the prmt-scan invariant, a multi-contour pixel flipped watermarking 31gb rithm for text images was proposed, which contans three measures as follows. First, a watermark compression preprocessing method was proposed. By compressing watermarking information, the number of times of watermark embedding is ncreased under the condition of a certain total embedding capacity, so as to improve the robustness of the watermark. Second, a mutcontour pixel flpping strategy was proposed whih can reduce the possblty of false embedding of the watermark, and further improve watermark robustness. Finally, characterzed by prinb scan invariant, combined with dscrete cosine transform and multi-contour pixel flipping strategy, an optimized dual-domain combined watermark embedding and extraction algorthm was proposed to improve the abllity of the watermark to resist print-scan attack whlle ensurng the invis ibllity of the watermark. Experiments show that the proposed algorthm can improve the robustness of the watermark aganst print-scan attack whlle ensuring the invisibllity of the watermark, and it can also resist common image attacks.