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Color image forensic method based on quaternion polar harmonic transform

A color image, polar harmonic transformation technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as low detection accuracy and excessive time complexity

Inactive Publication Date: 2017-06-09
LIAONING NORMAL UNIVERSITY
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Problems solved by technology

Among them, the detection methods for copy-paste tampering can be summarized into block-based detection methods and feature point-based detection methods: block-based methods generally have strong robustness and relatively high detection accuracy, but the time The complexity is seriously beyond the acceptable range of people; although the method based on feature points has solved the problem of time complexity well, the detection accuracy is far lower than the method based on block

Method used

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  • Color image forensic method based on quaternion polar harmonic transform
  • Color image forensic method based on quaternion polar harmonic transform
  • Color image forensic method based on quaternion polar harmonic transform

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Embodiment Construction

[0054] The method of the present invention includes four stages: adaptive superpixel block of the image to be detected, probability density SURF feature point extraction and feature region structure, The low-order quaternion extreme harmonic transformation feature expression and matching, and the superpixel sliding window method determine and mark the tampered area.

[0055] Specific steps such as Figure 5 Shown:

[0056] agreement: Refers to the color image to be detected; represent the number of image rows and columns, respectively; is the preprocessed smooth image; Initialize the number of superpixels for self-adaptation; is the constructed local feature region; match threshold for feature points; matrix Used to store inter-block correlation coefficients; match thresholds for blocks; matrix is a collection of feature vectors;

[0057] a. Initial setup

[0058] Get the image to be detected and initialize variables;

[0059] b. Adaptive superpixel blo...

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Abstract

The invention discloses a color image forensic method based on quaternion polar harmonic transform; the method comprises the following steps: carrying out adaptive segmentation based on entropy rate super pixel for a detected color image, combining a probability density SURF operator so as to extract feature points, and determining a local suspected tampered area; sliding window on the suspected area, using a quaternion polar harmonic transform coefficient moment value to express each slide window block feature, and carrying out similarity matching; finally determining and tagging the tampered area. According to tests results and compared with a conventional tamper detection method based on blocking, the color image forensic method can ensure a high detection correct rate, thus greatly reducing the algorithmic time complexity.

Description

technical field [0001] The invention relates to an image tampering detection method for copying and pasting, in particular to a color image forensics method based on quaternion harmonic transformation, and belongs to the technical field of digital image authentication. Background technique [0002] In recent years, with the rapid development of network and multimedia technology, digital multimedia resources are more and more vulnerable to illegal tampering and forgery, seriously infringing on the legitimate rights and interests of copyright owners. Therefore, the closely related multimedia security has received more and more attention, and the effective protection of intellectual property rights has become an important research topic. Image authentication technology is a method to identify the integrity and authenticity of digital images, and tamper detection technology is one of the commonly used methods. [0003] At present, digital image authentication technology is deve...

Claims

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Application Information

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IPC IPC(8): G06T7/136G06T7/155
Inventor 牛盼盼李硕王向阳杨红颖
Owner LIAONING NORMAL UNIVERSITY
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