High-robustness digital watermarking method for image maps
An image map and digital watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as inability to resist multiple combined attacks, complex algorithms, and image quality impact
Active Publication Date: 2015-09-16
HARBIN ENG UNIV
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Problems solved by technology
The space domain algorithm mainly embeds the watermark by modifying the pixel information. The algorithm is simple to implement, but the robustness is poor, the damage to the image is also large, and it cannot resist various attacks; the frequency domain algorithm uses discrete cosine transform, Fourier transform or wavelet The frequency domain coefficients are obtained by mathematical methods such as transformation, and the watermark is embedded by adjusting the frequency domain coefficients. This type of algorithm is complex and has a certain impact on the quality of the image, and it cannot resist multiple combined attacks.
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Embodiment 1
[0085] A strong and robust digital watermarking method for image maps, including watermark embedding and extraction, the steps include:
[0086] (1) Read the IMG image map file to obtain a linked list of all pixel information.
[0087] (2) Scan the watermark bitmap to obtain the watermark binary code, and generate the corresponding pseudo-random sequence.
[0088] (3) According to the scale of the map and the size of the pseudo-random sequence, the threshold is automatically set, and combined with the threshold, the map is translated in eight directions.
[0089] (4) For the eight shifted maps, randomly select three of them, together with the original map Figure 1 And as a map to be embedded with watermark.
[0090] (5) Use the HVS (Human Visual System) system to detect each map and obtain its feature points and pixel values.
[0091] (6) Calculate the difference between each feature point and the surrounding pixel points, and read the pseudo-random sequence, and add the p...
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The invention specifically relates to a high-robustness digital watermarking method for image maps. The high-robustness digital watermarking method comprises the steps of reading a linked list of nodes according a data structure of an IMG image map, and acquiring a pixel value of each node according to a corresponding field; acquiring watermarking binary codes, and generating a corresponding pseudorandom sequence; setting a value which is less than one pixel unit as a threshold value according to the map scale and the size of the pseudorandom sequence, and translating the map in eight directions; calculating a difference value between each feature point and a pixel point around, reading the pseudorandom sequence, and accumulating a product of a corresponding random sequence value and the pixel value difference to the pixel value of the feature point; and randomly selecting several of the maps in which a watermark is embedded to publish. The method provided by the invention realizes high-robustness watermark embedment and extraction. A watermark embedding carrier is based on the brightness difference of images, the watermark is embedded into a plurality of maps with extremely strong correlation, and the watermark can be restored through solving the correlation and an average pixel value of the maps once the watermark is damaged.
Description
technical field [0001] The invention specifically relates to a strong and robust digital watermarking method for image maps. Background technique [0002] Remote sensing imagery (satellite, aviation, ground close-up) as the carrier of earth observation to obtain the earth's surface coverage and structure information, is an indispensable source of information in the field of geoscience analysis and application. And how to convert geographic images into valuable information is crucial to the successful implementation of GIS and cartography projects. Today, more and more people around us are able to take advantage of the full range of geographic imagery products to extract and use valuable information. [0003] As the original data source of many digital maps, the authenticity and security of image maps have received special attention. It is necessary to safeguard the legitimate interests of map owners and prevent the map content from being tampered with. For this reason, rese...
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IPC IPC(8): G06T1/00
Inventor 孙建国李佳楠李博权
Owner HARBIN ENG UNIV