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A video prnu noise extraction method and camera source detection method

A noise extraction and noise technology, applied in the field of video PRNU noise extraction method and camera source detection, can solve the problem that PRNU noise cannot be reliably estimated and matched, and achieve the effect of reducing time complexity, improving performance, and reducing matching error rate

Active Publication Date: 2022-03-22
QILU UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical task of the present invention is to provide a method for extracting video PRNU noise and a camera source detection method for the above deficiencies, to solve the problem that PRNU noise in stable video clips still cannot be reliably estimated and matched

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  • A video prnu noise extraction method and camera source detection method
  • A video prnu noise extraction method and camera source detection method
  • A video prnu noise extraction method and camera source detection method

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Embodiment 1

[0064] In the vast majority of forensics scenarios in reality, because the photographer's mobile phone cannot be obtained, only the video taken by the mobile phone can be obtained. Therefore, it is more in line with the actual application scenario to extract the reference PRNU noise from a still segment of a certain length of video. In this case, not only the test PRNU noise, but also the reference PRNU noise are not reliable estimates of the sensor pattern noise, they are both affected by pixel misalignment between adjacent frames. After analysis, in a relatively still video sequence, not all frames may be subject to geometric transformations such as rotation and scaling brought about by rolling shutter correction technology or video stabilization. Therefore, extracting reference PRNU noise from still video is relatively reliable.

[0065] A kind of video PRNU noise extraction method of the present invention, utilize still video, carry out the extended calculation to the tra...

Embodiment 2

[0096] The similarity between the two two-dimensional matrices of the reference PRNU noise of the mobile phone and the test PRNU noise of the video to be tested is measured by the PCE value. If the correlation between the two noises is greater than a certain threshold, it is considered that the mobile phone has shot the video to be tested; otherwise, the video to be tested is considered to have nothing to do with the mobile phone. In order to calculate the PCE value on two two-dimensional matrices, it is first necessary to normalize the cross-correlation (Normalized Cross Correlation, NCC) reference PRNU noise and test PRNU noise, and calculate the cross-correlation coefficient of the noise signal by grouping to extract the calculation formula of PRNU noise, Extract and test the calculation formula of PRNU noise and expand the maximum likelihood estimation model to obtain PRNU noise. In addition to being subject to correction transformation, when calculating PRNU noise by group...

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Abstract

The invention discloses a video PRNU noise extraction method and a camera source detection method, belonging to the field of camera source detection, and the technical problem to be solved is that the PRNU noise in a stable video segment cannot be reliably estimated and matched. The extraction method includes: taking video frames with the same geometric transformation as the same group; replacing the numerator in the traditional video PRNU noise calculation formula with the sum of the product of each group of residual noise and video frame, and replacing the denominator in the traditional video PRNU noise calculation formula For the video frames from the same group, the video PRNU noise calculated for each group of video frames is accumulated. The detection method includes: expanding the traditional PRNU noise calculation formula based on the maximum likelihood estimation method through the above method; performing overlapping and striping on the PRNU noise, and matching the reference PRNU noise and the test PRNU noise; judging the test video according to the single peak value Is it from the reference phone.

Description

technical field [0001] The invention relates to the field of camera source detection, in particular to a video PRNU noise extraction method and a camera source detection method. Background technique [0002] Source camera identification (SCI) is a method to link an image or video with its capture device. Currently, most methods are based on the extraction and matching of PPRNU noise. PRNU, on the other hand, is caused by poor manufacturing process of the camera sensor and appears in all media captured by the camera. Because PRNU noise is stable and unique to the camera and the media it captures, it is possible to use PRNU noise as a "fingerprint" for camera source detection. [0003] With the wide application of video, it is found through experiments that extending the traditional method of extracting PRNU noise from images to video cannot achieve ideal results, and there are mainly two problems. [0004] One problem is that video files have more data than images, and are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232G06T5/00
CPCG06T5/002H04N23/951H04N23/682H04N23/689
Inventor 李健马宾扈媛媛王春鹏吴晓明杨美红
Owner QILU UNIV OF TECH
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