Protection method of GPS and BeiDou positioning system space-time information in internetwork 0perating system (IOS) terminal digital images

A Beidou positioning and digital image technology, applied in image watermarking, image data processing, image data processing and other directions, can solve the problems of easy loss and tampering of time information and space information.

Inactive Publication Date: 2016-11-16
NANJING NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for protecting the time and space information of GPS and Beidou positioning system in the IOS digital image in view of the problem that the time information and spatial information of the digital image on the IOS end are easily lost and easily tampered with during transmission.

Method used

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  • Protection method of GPS and BeiDou positioning system space-time information in internetwork 0perating system (IOS) terminal digital images
  • Protection method of GPS and BeiDou positioning system space-time information in internetwork 0perating system (IOS) terminal digital images
  • Protection method of GPS and BeiDou positioning system space-time information in internetwork 0perating system (IOS) terminal digital images

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with examples.

[0039] In this example, the iPhone 5s is selected as the test device, and the image obtained by taking a photo is selected as the test image. The format is JPEG, and the size is 3264×2448.

[0040] Step 1. Acquisition of spatio-temporal information and generation of watermark information based on spatio-temporal information:

[0041] Step 1.1: Obtain time information and latitude and longitude information from the GPS module of iPhone 5s. The time acquired in this embodiment is "2016-01-28 20:20:55", and the acquired latitude and longitude of the test site is "118.91075°E 32.11676°N". Omit the format symbols in it to obtain the numeric characters in the time and latitude and longitude information: "20160128202055118910753211676", a total of 29 digits;

[0042] Step 1.2: Use the linear congruential function and use the current clock as a random number seed to generate 10 gro...

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Abstract

The present invention discloses a protection method of GPS and BeiDou positioning system space-time information in IOS terminal digital images. In allusion to the problem that the time information and the space information of the digital images of the IOS users are easy to lose and tamper during a propagation process, the advantages of a digital watermark technology at the aspects of image authentication and data protection are given full play. When the watermark information is embedded, the block discrete cosine transform (DCT) is carried out on the images, and according to the length of the watermark information, the images are divided, and the watermark information is embedded in each area, and the characteristic identifiers are arranged in the embedded areas, and finally, the fragile watermarks are embedded in the image data. When the images are detected, whether the data contains the fragile watermarks is detected to determine whether the images are tampered. By searching the characteristic identifiers, the areas containing the watermarks are positioned rapidly, thereby extracting the watermark information efficiently. The protection method of the present invention enables the tamper-proofing capability of the images to be improved and the data security to be enhanced. Moreover, the time-space information can be combined with the digital image data itself tightly, thereby providing the technical means for the accurate positioning and the effective authentication of the images.

Description

technical field [0001] The invention belongs to the field of image data security, and in particular relates to a protection method based on GPS and Beidou positioning system space-time information in IOS terminal digital images. Background technique [0002] As the basis of social life, spatiotemporal information contains important information of human activities. With the popularization of GPS and domestic Beidou positioning system applications, the acquisition of space-time information has become very convenient. However, the combination of spatio-temporal information and digital image data is generally done by embedding spatio-temporal information into the EXIF ​​information of digital images, which is not closely combined with the data itself. With the rapid development of mobile Internet technology and smart mobile devices, the spatiotemporal information of digital images is easily lost or tampered with during a series of transmission processes, which has a huge impact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0042G06T2201/005G06T2201/0065
Inventor 朱长青俞一恒任娜王莹莹吴清华王潇
Owner NANJING NORMAL UNIVERSITY
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