Method for extracting digital video fingerprints

A technology of digital video and extraction method, which is applied in the field of communication information security, and can solve problems such as bit sequence changes, file format changes, and local operations that cannot be used

Inactive Publication Date: 2011-10-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hash conversion cannot solve two problems: one is the change of bit order, and the other is the change of file format
There are three problems with digital watermarking: one is that the watermark will change the content of the video itself, the other is that the watermark must be embedded in the video before it is relea

Method used

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  • Method for extracting digital video fingerprints
  • Method for extracting digital video fingerprints
  • Method for extracting digital video fingerprints

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Experimental program
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Embodiment

[0033] In the human visual system, everything in the world is the object perceived by the visual system. Human beings know and discover things through this perception. Among the many perceptual things, the perception of things in continuous motion is particularly important. Pictures that change over time will not change the temporal and spatial relationship between pictures, but the brightness of an image has an important relationship with its temporal or spatial positioning.

[0034] Visually, changes in brightness intensity constitute different stimuli to the visual system, and changes in brightness are usually described by the concept of contrast. The viewing angle is used as the unit of space to accurately describe the size of the entire space. With space, variation in space (contrast variation), and spatial units (viewing angle), spatial frequency (f) can be defined. Spatial frequency refers to the number of contrast changes per unit viewing angle. Studies have shown ...

example

[0072] According to the core issues of video content identification and monitoring mentioned above, we verified the robustness and sensitivity to content changes of the digital video fingerprint proposed by the present invention through experiments, and analyzed the fingerprint extraction by this method Efficiency and fingerprint overhead. Finally, we did a variety of attack tests, obtained the similarity between the attacked video and the original video, and analyzed the data.

[0073] 1), Robustness

[0074] The robustness of video features is mainly reflected in the case of the same video content, robust to video format conversion, and robust to video size changes. Therefore, we selected an original AVI video with a length of 30 seconds and a screen size of 320X240 for experimental analysis, and performed format conversion and size conversion on the original video. We use the L1-distance matching method to measure the similarity between the converted video and the original...

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Abstract

The invention discloses a method for extracting digital video fingerprints. The method comprises the following steps of: extracting video slices of vision perception characteristics of a video fragment sequence, analyzing frequency domain characteristics of the video slices, processing the video slices by effectively using time-space relativity among the video contents and using 2-dimensional discrete wavelet transform (2D-DWT), and extracting horizontal detail component coefficients or vertical detail component coefficients in the 2D-DWT to serve as fingerprint information. The horizontal detail component coefficients or the vertical detail component coefficients reflect the stimulation of video content change on vision perception rather than low-level characteristics, such as color or gray, of a video frame at a certain moment, so that the method has good robustness for different video formats and different video contents. Meanwhile, the video slices are uniformly distributed in the whole video fragment, reflect the content change of the whole video fragment and have sensitivity, so that the method can meet requirements on video content identification and monitoring and precaution to various attacks. Meanwhile, by using the method, the size of the fingerprints is greatly reduced, and the efficiency of fingerprint extraction is improved. Therefore, the performance of the method is superior to that of the conventional digital video fingerprint extraction method.

Description

technical field [0001] The invention belongs to the technical field of communication information security, and more specifically relates to a method for extracting digital video fingerprints. Background technique [0002] With the rapid development of information technology, due to the increase of access methods and the variety of transmission services, the storage, transmission and copying of video information are facilitated, and the amount of video information increases rapidly. This poses greater challenges to the "manageable, controllable, and credible" requirements of the network, and also puts forward new requirements for the monitoring of digital video content security. [0003] At present, the monitoring of illegal broadcast signals mainly adopts the method of index measurement and manual judgment, and there are problems such as inaccurate alarm, long alarm time, and many occupants, which will inevitably lead to the accuracy, completeness, timeliness, and synchroniz...

Claims

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Application Information

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IPC IPC(8): G06K9/46
Inventor 徐杰隆克平陈龙赵洪健闫朝喜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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