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Synchronous information extraction method and system for video leakage signal

A technology for leaking signals and synchronizing information, used in the field of communications

Inactive Publication Date: 2015-04-29
INST OF INFORMATION ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the defects of the prior art, the present invention provides a method and system for extracting synchronous information of video leakage signals, which can accurately and automatically extract the line frequency and field frequency of the video signal in the presence of noise and interference signals

Method used

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  • Synchronous information extraction method and system for video leakage signal
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  • Synchronous information extraction method and system for video leakage signal

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Embodiment Construction

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0056] like figure 1 As shown, it is a schematic flowchart of a method for extracting synchronous information of a video leakage signal provided by an embodiment of the present invention, and the method includes the following steps:

[0057] 101. Obtain a power spectrum of a video leakage signal, and divide the power spectrum into multiple subbands according to a preset subband width.

[0058] 102. Obtain a spectral centroid of each subband, and obtain a spec...

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Abstract

The invention provides a synchronous information extraction method for a video leakage signal. The method comprises the following steps: the power spectrum of the video leakage signal is acquired and divided into multiple sub-bands; the spectral centroid of each sub-band is acquired, and an interval between the spectral centroids of every two sub-bands is acquired; line frequency or field frequency of the signal is acquired according to the uniform degree of the spaced distribution of the spectral centroids. The invention further provides a synchronous information extraction system for the video leakage signal. The system comprises a segmentation module, a calculation module and an extraction module. The line frequency or field frequency of the video signal can be extracted accurately and automatically in the presence of noise and interference signals.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for extracting synchronous information of video leakage signals. Background technique [0002] Information equipment will produce different degrees of electromagnetic leakage during the working process. This electromagnetic leakage signal may contain sensitive information processed by information equipment. Through specific equipment and signal processing methods, the electromagnetic leakage signal can be intercepted and restored. Sensitive information threatens information security. Therefore, as the key technology of this problem, electromagnetic leakage signal detection has become a research hotspot and focus in various countries, and how to effectively realize the detection of electromagnetic leakage signal has become an urgent research topic. [0003] At present, the technology used to extract the synchronous information of the electromagnetic lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N17/00
Inventor 孙德刚石珺魏冬张萌黄伟庆
Owner INST OF INFORMATION ENG CHINESE ACAD OF SCI
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