Watermark template generation method and device for embedding hidden digital watermark into image

Abstract

The invention provides a watermark template generation method and device for embedding an implicit digital watermark into an image, and the method comprises the steps: building a matrix with a presetsize, carrying out the two-layer wavelet decomposition of the matrix with the preset size, and obtaining a decomposed low-frequency channel and other channels; carrying out discrete cosine transform on the low-frequency channel to generate a transformed matrix; obtaining watermark information, adding the watermark information to the middle position of the transformed matrix according to a preset algorithm and based on predefined positive / negative template information, and obtaining a matrix added with the watermark information; performing inverse discrete cosine transform on the matrix added with the watermark information to obtain an inverse transformed matrix; and replacing the low-frequency channel with the matrix after inverse transformation, and performing inverse wavelet transformation on the matrix after inverse transformation and other channels to obtain a reconstructed image so as to generate a watermark template. According to the method, the watermark information can be embedded into the image in a mode of combining the positive watermark template and the negative watermark template, so that the calculated amount of data is greatly reduced, and the watermark embedding processing speed is increased.

Description

technical field

[0001] The invention relates to the technical field of image processing, in particular to a method and device for generating a watermark template for embedding an implicit digital watermark into an image. Background technique

[0002] With the development of computer and network technology, the Internet has been integrated into all aspects of people's lives. Due to its fast and convenient features, more and more people use the Internet to publish photos, videos and other creative achievements. However, it is also due to the convenience of this dissemination that it has caused some copyright disputes, thus hindering its own development. At present, the copyright protection of online photo works is not only a legislative issue, but also a very important technical problem. As an effective method of digital media copyright protection, digital watermark technology has aroused great interest both at home and abroad in recent years.

[0003] Digital watermark tech...

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