YIQ color image holographic watermarking algorithm based on Contourlet-SVD domain

Abstract

The invention discloses a YIQ color image holographic watermarking algorithm based on a Contourlet-SVD domain. The YIQ color image holographic watermarking algorithm comprises the following steps of reading an original color RGB image, converting an RGB color space of the color image into a YIQ color space, selecting a Y component in the color space after conversion, and performing three-layer Contourlet conversion on the Y component; carrying out SVD singular value decomposition on the low-frequency coefficient; reading a watermark image formed by a flight college; firstly, a watermark imageof a flight college is correspondingly adjusted through a random encryption phase template, two-dimensional Fourier transform is carried out on the watermark image after adjustment, then the image after Fourier transform is correspondingly adjusted through the random encryption phase template, and finally an encrypted digital holographic image is generated. The method comprises the following steps: performing weighted watermark embedding on a hologram, reconstructing a unitary matrix corresponding to an original image, performing Contourlet transformation on a reconstructed sub-image to a mapping of the sub-image, replacing an original Y component with the mapping, and converting a YIQ model into an RGB watermark-containing image. According to the invention, the original image informationis effectively hidden, and the confidentiality is high.

Description

technical field [0001] The invention relates to technical fields such as information security, image processing, multimedia technology, cryptography, etc., and particularly relates to a YIQ color image holographic watermark algorithm based on a Contourlet-SVD domain. Background technique [0002] With the increase of people's general demand for computers in modern society, the use of computer networks is so huge that it has become an indispensable part of people's lives. Therefore, information security has become particularly important. The security of digital products disseminated in the network Sex has attracted people's attention. Digital watermarking technology is to protect the copyright of digital products. The information that can prove the ownership of the product is embedded into the product in a certain way. When it comes to copyright disputes, the copyright information will be extracted to prove the ownership of the product. It is required that after the algorith...

AI Technical Summary

Problems solved by technology

In recent years, many multi-scale geometric analysis tools for images (Ridgelet, Bandlet, Curvelet, Contourlet, etc.) have appeared. None of the algorithms can resist rotation attacks very well, and the commonly used Arnold scrambling transformation in the algorithm may expose the watermark information when the number of transformations is unreasonable.

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