Robust reversible watermark embedding and extracting method based on histogram neighborhood

Abstract

The invention discloses a robust reversible watermark embedding and extracting method based on histogram neighborhood, mainly solves the shortage of poor comprehensive properties of the existing method. The method comprises the following steps of: firstly partitioning an original image, and screening a set of candidate blocks by means of embedding level; then calculating characteristic values of the candidate blocks, determining peak value pair, and obtaining a set of reliable embedding blocks by means of neighborhood selection of the peak value pair; finally, implementing watermark embeddingby modifying the characteristic values of the embedding blocks; in the extraction process, the embedding block of an image to be detected is obtained, and the characteristic histogram value sequencesof the embedding blocks are sorted by means of a clustering algorithm to obtain a set of sorted sequences, then the watermark is extracted by comparing the characteristic values of the embedding blocks with the sorted sequences, and a reconstructed image is subsequently obtained by modifying the characteristic values of the embedding blocks in the image to be detected. The embedding and extracting method has the advantages the robustness with reliable loss compression attack to JPEG (Joint Photographic Experts Group) and JPEG2000 is provided, the capacity is large, the invisibility is good, the overall performance of the method is superior to that of the similar methods, and the method can be applied to the copyright protection of a digital image.

Description

technical field [0001] The invention belongs to the field of multimedia information security and relates to a digital image watermark embedding and extraction method, which can be used for content authentication, copyright protection and infringement tracing of digital images in a network environment. Background technique [0002] With the rapid development of computer and network communication technology, digital technology represented by multimedia information has widely penetrated into military, industrial, medical, educational and other fields, which marks that human society has entered a new era of digital information. With the help of advanced electronic equipment such as scanners and printers and mature computer software, people can conveniently and quickly transmit digital information such as images and videos to every corner of the world. On the one hand, it not only improves the efficiency, accuracy and convenience of information expression, but also realizes the "...

AI Technical Summary

Problems solved by technology

Compared with the first type of method, although this type of method eliminates the "salt and pepper" noise and improves the visual quality of the watermarked image, it still has low capacity, reversibility and robustness due to the use of error correction codes. sexual insecurity

Although the literature "Gao X B, An L L, Li X L, and Tao D C. Reversibility improved lossless data hiding. Signal Processing, 89(10): 2053-2065, 2009" improved the reversibility of the method proposed by Ni et al., but still The problem of low capacity and unreliable robustness of this type of method has not been completely solved

Images