Image digital watermark embedding method and image digital watermark detecting method

Abstract

The invention provides an image digital watermark embedding method and an image digital watermark detecting method. The watermark embedding method comprises the following steps of: dividing a source image into a center circular block and a plurality of ring belt blocks, and transforming each set of data by a transform domain watermark algorithm and embedding the image digital watermark into the source image; and the watermark detecting method comprises the following steps of: carrying out a blocking step which is as the same as the embedding process on an image to be detected, transforming by the same transform domain watermark algorithm, and extracting and comparing the watermark. After the watermark embedding method and detecting method of the invention are adopted, the technical problem that the common image digital watermark is bad in attack robust performance resistance and small in watermark information capability in the prior art can be solved, the rotation with any angles can be resisted, the zooming with larger times can be resisted, the geometrical transformation attack with larger edge cutting can be resisted, and the methods are easily combined with the other digital watermark technologies, so that the non-geometric transformation attack such as the channel noise, the filtering and the lossy compression can be resisted.

Description

technical field [0001] The invention relates to the technical field of image digital watermark; more specifically, it relates to an image digital watermark embedding method and a detection method thereof. Background technique [0002] In the field of digital watermarking technology, geometric transformation processing such as rotation, cropping, and scaling are the most commonly used attack methods by digital image copyright pirates. The direct consequence of these attack methods is to destroy the synchronization between the digital watermark detector and the digital watermark, so that The detector cannot detect the digital watermark signal in the image. Along with geometric transformation attacks, copyright pirates may also implement attacks such as channel noise, filtering, and lossy compression. When a digital image undergoes geometric transformation, a large number of interpolation operations are required. While the position information of the original digital image inf...

AI Technical Summary

Problems solved by technology

However, the common digital image watermarking technology in the prior art has poor robustness against attacks and the watermark information capacity is small, so it cannot well resist the attack methods commonly used by pirates.

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