Digital watermarking embedding and detecting method based on three-step phase shift interferometry

Abstract

The invention provides a digital watermarking embedding and detecting method based on a three-step phase shift interferometry. The method includes a watermarking embedding process and a watermarking detecting and extracting process. The method utilizes a propagation law of a numeric field simulation optical process, so that processes that the watermarking is embedded in a digital image to be protected and the watermarking is detected from an image embedded with the watermarking are achieved, and an encryption and a decryption for information are achieved through a double random phase code and a phase shift interferometry of a Fresnel field. The digital watermarking embedding and detecting method based on the three-step phase shift interferometry has the advantages that a phase shift algorithm is introduced to a digital holography, the disadvantages and the shortages of a coaxial digital holography and an off-axis digital holography are overcome by the phase shift interferometry, and a novel information hiding encryption/decryption method is formed; the decryption can be directly performed without original plain code images in the watermarking detecting process, and the method belongs to a blind watermark algorithm; compared with traditional data encryption processes, the method is highly free and safe; and the method is high in measurement accuracy, easy to operate, rapid in processing speed, high in portability, capable of achieving the overall measurement, and the like.

Description

technical field [0001] The invention relates to a digital watermark embedding and detection method based on three-step phase-shifting interferometry, and belongs to the technical field of photoelectric information security. Background technique [0002] With the rapid development of multiple disciplines such as communication technology, computer science, cryptography and network technology, information has become an important strategic resource for social development, and social informatization has become the trend and core of today's world development. Research in the field of information security has been universal attention around the world. The protection method of traditional information security technology based on cryptography theory is to encrypt encrypted information into meaningless ciphertext, so that illegal users cannot read it. But with the rapid improvement of computer processing power, the traditional information security technology has been greatly challeng...

AI Technical Summary

Problems solved by technology

The main shortcomings of the digital watermarking technology reported so far are not robust enough, the embedded information of the watermark is too large, the imperceptibility of the watermark is not good enough, etc.

[0007] At present, the combination of phase shift interferometry and digital holography technology for digital watermark embedding and detection has not been reported in the literature.

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