Color image holographic watermarking method based on wavelet de-noising

Abstract

The invention relates to a color image holographic watermarking method based on wavelet de-noising. The wavelet de-noising processing is performed on an extracted watermark image so as to achieve that a computer accurately and objectively distinguishes watermark information. Firstly, forward wavelet transformation and optical computer-generated holographic double-random-phase encryption watermark embedding are performed on an original color image to obtain a color image containing the watermark information; secondarily, reverse wavelet transformation and optical computer-generated holographic double-random-phase decryption watermark extraction are performed on the obtained color image containing the watermark information to obtain a holographic watermark image; thirdly, two-dimensional wavelet de-noising and binarization processing are performed on the holographic watermark image to obtain a de-noising watermark image. Compared with an existing digital watermark algorithm, the method facilitates watermark image analysis and processing, brings convenience to the computer for accurate and objective distinguishing on the watermark information, and enables the extracted watermark image to be accurate. The color image holographic watermarking method can have application value on batch watermark authentication.

Description

technical field [0001] The invention relates to a method for digital printing image copyright protection, in particular to a color image holographic watermarking method based on wavelet noise reduction, which belongs to the technical field of digital watermarking. Background technique [0002] As one of the information hiding technologies, digital watermarking technology can become the mainstream digital asset preservation and protection measure because of its security, concealment and robustness. It can embed some identification information into the digital content without affecting the effective use value of the original digital content, such as digital printing images and other multimedia content, so as to protect its copyright. [0003] Wavelet technology is one of the typical digital watermarking algorithms commonly used in recent years, which belongs to the transform domain algorithm. Using wavelet technology to embed watermark has high concealment, can't be distingui...

AI Technical Summary

Problems solved by technology

However, due to the use of holographic encryption technology, it can be found that there is a certain amount of white noise in the extracted watermark image, which is not conducive to image analysis and later computer objective identification of watermark information. Therefore, in the field of digital watermark technology, in order to extract the watermark image completely and clearly, Further research is needed to adopt a more comprehensive and efficient digital watermarking method

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