Method for generating digital photo containing watermark based on state parameter

Abstract

The invention provides a method for generating a digital photo containing a watermark based on a state parameter. The method comprises that: when a digital camera takes a photo, an image signal is processed through a central processor to obtain digital image data; the central processor reads the focal length, aperture, exposure time, shooting time and photosensibility when taking the photo as state parameters; a camera key is generated by a camera identification number and a key set function; the state parameters and the camera key are used as a plaintext, and an authentication key of the digital photo is generated by hash function; the authentication key is used to generate watermark-containing digital image data of the image data; and the watermark-containing digital image data is synthesized with a header file EXIF of the photo into a photo output file to be stored in an external memory of the camera. The authentication key of the digital photo containing watermark generated by the method has good privacy, not only can effectively prevent 'collage attack', but also can effectively resist 'copying attack'. Meanwhile, participation of the digital camera or key transfer is not required in authentication, so that disclosure and high efficiency of the digital photo authentication are realized.

Description

Technical field [0001] The invention relates to a method for generating a watermarked digital photo, which is used for conveniently, timely and openly detecting and verifying the authenticity, integrity and originality of the digital photo. Background technique [0002] Today, with the increasing development of computer technology, network communication technology and digital imaging technology, digital cameras have entered thousands of households, and digital photos taken by digital cameras have become our main source of information acquisition and exchange and an important carrier of information dissemination. At the same time, the digital storage of images and the emergence of various image processing software make the editing, modification and synthesis of digital photos very simple. On the one hand, digital image processing technology can improve the display quality of images, enrich our life and facilitate our work. On the other hand, if tampering and forging digital ...

AI Technical Summary

Problems solved by technology

[0010] However, the following problems still exist in the prior art: (1) the digital camera for taking digital photos must participate in the authentication process of digital photos, which is not feasible in some practical applications

At the same time, by tampering with the digital photo header file EXIF ​​including the focal length, aperture, exposure time, shooting time, sensitivity and other state parameters, the attacker can destroy the obvious evidence of using the basic common sense of optical imaging to determine the "remake photo", so that the The authentication watermarking algorithm cannot provide strong evidence to prove that the "remake photo" is forged, that is, the existing authentication watermarking algorithm is difficult to effectively resist the "remake attack"

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