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Android photo position and time digital watermark embedding and extraction method

A watermark embedding, time digital technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of reducing the credibility of photos, the relationship between difficult photos and the location and time when they were taken, and leaking the photographer's privacy. , to achieve the effect of convenient browsing and sharing, good stability and invisibility

Inactive Publication Date: 2017-02-01
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase in the number of photos and the passage of time, it is often difficult for users to associate photos with the location and time when they were taken when managing photos
Although some mobile phone camera software will add location information and time information to the properties of the photo, since the location and time information are explicitly stored in the header file of the photo, it is easy to modify and see, which greatly reduces the credibility of the photo
At the same time, it is also very easy to leak the privacy of the photographer, and there are serious security risks.

Method used

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  • Android photo position and time digital watermark embedding and extraction method
  • Android photo position and time digital watermark embedding and extraction method
  • Android photo position and time digital watermark embedding and extraction method

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Embodiment Construction

[0044] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0045] This implementation selects Xiaomi mobile phone, the model is MI 4LTE-CMCC, and the Android version is 4.4.4KTU84P, and the authentication example is carried out according to the present invention, and the present invention is further described in detail.

[0046] Embedding process of digital watermark:

[0047] Step 1. Watermark information generation

[0048] Step 1.1: Use a pseudo-random sequence generator as a meaningless watermark generation method, and use the preset watermark seed number Seed: 3 as input to generate a binary sequence with 10 rows and 50 columns of "0" and "1" randomly and uniformly distributed W.

[0049] Step 1.2: Obtain and save the latitude, longitude and time information when the mobile phone took the photo, as the character string L to be embedded, and record the binary sequence W generated in step 1. The ...

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Abstract

The present invention discloses an Android photo position and time digital watermark embedding and extraction method. The method is based on the digital watermark technology, and the position information and the time information at shooting are added in a photo shot by the Android. A blocking DCT being compatible to a JPEG compression standard is embedded, the watermark information is embedded in a medium frequency coefficient after DCT conversion of the Y channel of the photo, and the watermark position is embedded in the medium frequency coefficient after the DCT conversion of the U channel of the photo to realize watermark information synchronization. The watermark detection method comprises: mobile phone local SC card photo reading, watermark extraction and information conversion. The watermark extraction includes: the watermark position is extracted in the medium frequency coefficient after the DCT conversion of the U channel of the photo, the watermark information is extracted in the medium frequency coefficient after the DCT conversion of the Y channel of the photo, and finally, the extracted watermark information is converted to the position information and the time information. The information added through adoption of the invention has good stability and invisibility, can combine a map to display photos on the corresponding shooting position so as to bring convenience for photo browsing and sharing.

Description

technical field [0001] The invention relates to a method for adding shooting location (latitude and longitude information) and shooting time to photos taken by an Android device, specifically a method for embedding and extracting digital watermarks based on digital watermark technology for location and time digital watermarks of Android photos. Background technique [0002] Digital watermarking technology is the cutting-edge technology of data security protection developed in recent years. A digital watermarking published by Van Schyndel in 1994 (Van Schyndel R G, Tirkel A Z, Osborne C F.Adigital watermark. In: Proceeding of the First IEEE International Image Processing Conference, 1994 (2): 86-90.) marked the birth of the research field of digital watermarking technology. Although the technology started relatively late, due to its important role in data copyright protection, usage tracking, integrity verification and other fields, it has developed rapidly. Research institut...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0057G06T2201/0061
Inventor 朱长青吴清华任娜林威俞一恒佟徳宇王莹莹
Owner NANJING NORMAL UNIVERSITY
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