Research On Anti-distortion Halftone Watermarking Algorithm Based On Error Correction Code Technology And Application

Halftone image is widely used in the printing and publishing industry.In order to get rid of the low security of traditional watermarking in the traditional printing and publishing industry,the watermarking algorithm for halftone image with high production cost has become a hot research question.However,most of the existing watermarking algorithms are for grayscale image and color image,and there are not many researches on halftone image watermarking algorithm,especially the research on the robust watermarking algorithm against geometric distortion can not meet the practical needs of print copyright protection.In order to extract watermarks and improve the extraction rate of halftone images after printing and scanning,an anti-printing watermarking algorithm based on feature points and linear transformation is proposed in this paper.The algorithm combines feature points with linear transformation,calculates the correlation coefficient of image change after printing and scanning,and calculates the distance between the locating feature point and the watermark feature point,so as to accurately locate the watermark embedding position.The experimental results show that the watermark extracted by this method is of good quality.To improve the geometric distortion resistance of halftone images.In this paper,an anti-distortion watermarking algorithm based on error correction code is proposed.Reed-solomon(RS)encoding is used to improve the robustness of watermarking.In this paper,the singular value decomposition(SVD)algorithm is binary improved for watermarking compression,which effectively improves the embedding rate of halftone image watermarking.In order to solve the synchronization problem of distorted watermark,this paper adopts the pre-correction technique for the image,and the watermark effect extracted from the corrected image is better.In this paper,the anti-distortion halftone watermarking algorithm based on error-correcting code technology is tested for anti-printing scanning and geometric distortion.Experiments show that the proposed algorithm can effectively enhance the robustness of halftone image watermarking,and improve the anti-printing scanning and anti-distortion performance of watermarks.