Digital watermarking method and device for digital image
A digital image and digital watermarking technology, applied in the field of digital image processing and information security, can solve the problems of information loss, poor visual effect, small amount of information embedding, etc., and achieve good adaptability and robustness
Active Publication Date: 2007-07-11
BEIJING FOUNDER ELECTRONICS CO LTD +2
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[0010] The present invention provides a method and device for embedding and extracting digital watermarks of digital images, which are used to improve the robustness of digital watermarks in use, solve the problems of small amount of information embedded in digital images and poor visual effects, and further It perfectly solves the problem of information loss caused by image distortion, geometric deformation, printing, scanning and copying when digital images are used in plain paper documents
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[0073] The idea of the present invention is to embed the watermark information into the digital image by dividing the digital image according to a certain method, using the proportional relationship between the number of black dots and the average number of black dots in each subdivision sub-region and the step size, Thus, a digital watermark embedding and extraction method for digital images is obtained. The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.
[0074] Since the image of the digital seal is representative of the information security requirements of the digital image, the implementation takes the embedding and extraction of the digital watermark in the digital seal as an example to illustrate. In the implementation, the digital seal image of the embodiment has a prominent seal feature, i.e. a circle, but along with the description of the specific implementation of the present invention, it is...
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The invention relates to a digital watermark embedding and extraction method and device for digital image. For embedment, it divides the digital image into several sub areas, calculating the number of black dots of each zone, calculating the first number of the pixel to be converted based on the number of black dots and its mean, watermark information series, and No. 1 step length, converting each pixel in each sub area based on the first number. Dividing the digital image into several sub areas based on No. 1 rules, extracting the watermark information series based on the black dot number and its mean and the No. 1 step length. It can better fight the undetermined factors in the process of printing, scanning and photocopying with excellent adaptability and robustness.
Description
technical field [0001] The invention relates to the fields of digital image processing and information security, in particular to a method and device for digital image embedding and extraction of digital watermarks. Background technique [0002] With the rapid development and wide application of digital image processing, digital image processing technology and information security are also closely integrated. For example, digital image processing in the form of seals has the typical characteristics of digital image combined with information security requirements. [0003] Seals have a long history and have special status and functions in political, economic and cultural life. There are many types of seals, including office seals serving state agencies, enterprises, institutions, and social groups, and personal seals serving the general public. As a credential certificate, the seal plays an important role in various fields of social life. Also because of the special role of...
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Inventor 亓文法李晓龙
Owner BEIJING FOUNDER ELECTRONICS CO LTD