Color image digital watermark embedding and extracting method suitable for QR code

Abstract

The invention discloses a color image digital watermark embedding and extracting method suitable for a QR code, and the method comprises the following steps: encrypting a QR code watermark, and obtaining an encrypted QR code sequence through Logistic mapping and Arnold scrambling; preprocessing the color image, combining DWT with DCT, and obtaining a dct coefficient matrix after preprocessing; watermark embedding: after singular value decomposition is carried out on the dct coefficient matrix, embedding a QR code to obtain a color carrier image embedded with the QR; and watermark extraction: extracting an encrypted QR code sequence from the carrier image embedded with the QR code, and decrypting the extracted QR code sequence to obtain a QR code watermark. According to the method for embedding and extracting the digital watermark, double encryption is carried out on the QR watermark by utilizing Logistic mapping and Arnold scrambling, and the QR code watermark is embedded and extracted by combining DWT, DCT and SVD, so that the security, invisibility and robustness of the watermark are improved.

Description

technical field [0001] The invention relates to digital watermark technology, in particular to a color image digital watermark embedding and extraction method suitable for QR codes. Background technique [0002] With the vigorous development of the Internet, people are constantly exploring new computer technologies, and more and more digital products appear on the market, such as audio, e-books, video and pictures. The emergence of digital products has brought convenience to our lives, allowing us to obtain the information we need more quickly. But everything has pros and cons. With the increasing number of digital products, problems such as piracy and copyright infringement also follow. With the improvement of people's awareness of rights protection, piracy and infringement of digital products have increasingly become problems that need to be solved urgently in society. [0003] The so-called digital watermark refers to the intrusion of certain information in digital medi...

AI Technical Summary

Problems solved by technology

The existing single digital watermarking technology has a small amount of embedding of watermark information, and its robustness and invisibility are poor

For example, LSB is limited by its hidden principle, embedded watermark is fragile, it is difficult to resist some lossy image transformation attacks, and it is difficult to be applied on a large scale; DFT has weak anti-compression ability and low efficiency; DCT calculation is complicated; wavelet transform embedding strength Slightly larger will easily destroy the transparency of the image

Images