Image tamper-proofing detection algorithm based on DCT
A detection algorithm and anti-tampering technology, applied in image data processing, image data processing, computing and other directions, can solve the problems of high false detection rate and poor detection effect.
Pending Publication Date: 2020-12-01
江苏水印科技有限公司
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These methods are too passive, and have a high false detection rate, and the detection effect of conventional tampering methods such as copy-move is not good.
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[0068] Such as figure 1 In the overall flowchart of the image anti-tampering detection algorithm shown, there are two entities, that is, the tamperer and the verifier. The authenticator provides the watermark detection embedding method in the present invention to carry out digital image encryption (steps S1-S10) on all images taken by the tamperer (steps S1-S10), wherein the original photographed image is converted and extracted from its Y color gamut component for embedding (step S1), according to the The size of the image is divided into blocks and quantized for its Y color gamut components (step S2), and the key is obtained by a random algorithm to generate fragile watermark information (step S3), and the watermark information is embedded by adjusting the DCT coefficient of the block (step S4) , the DCT-transformed image blocks are reverse-transformed and restored and merged with the CbCr color gamut component of the original image to generate an encrypted image (step S5), ...
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The invention relates to the technical field of image tamper-proofing detection algorithms based on DCT. The DCT-based image tamper-proofing detection algorithm specifically comprises the following steps of S1, performing preprocessing calculation on a carrier image Im according to a preprocessing calculation formula, converting the carrier image Im into a YCbCr color gamut, and zooming the YCbCrcolor gamut to enable the length and the width of the YCbCr color gamut to be multiple of 8; s2, according to the size of a Jpeg compression block, partitioning the Y color gamut part of the originalimage by using 8 * 8 pixel blocks, and marking each small block as i1, i2, i3,..., in; s3, generating 01 uniformly distributed watermark information S according to the random sequence, wherein each bit in S is marked as S1; s2, S3, ..., Sn, according to the invention, the algorithm is applied to the image; according to the method, the watermark information is extracted and compared again, the tampered area is positioned and the authenticity of the image is recognized after the watermark information is maliciously tampered, and the algorithm can be effectively applied to images of different sizes and has robustness for general copy-move tampering and Jpeg compression.
Description
technical field [0001] The invention relates to the technical field of an image anti-tampering detection algorithm based on DCT transformation, in particular to an image anti-tampering detection algorithm based on DCT transformation. Background technique [0002] Digital watermarking technology is a commonly used method to hide information in the carrier medium, and after hiding, it will not affect the use value of the original carrier, and it will not be easily noticed or noticed by people. Through the information hidden in the carrier, the purpose of confirming content creators, buyers, transmitting secret information, or judging whether the carrier has been tampered with can be achieved. The popularization of smart phones has made it possible for non-professionals to take photos and collect evidence anytime, anywhere. However, the results of taking photos and collecting evidence are very easy to be tampered with by lawbreakers in order to achieve profits such as defraudin...
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IPC IPC(8): G06T1/00
CPCG06T1/0042G06T2201/0061G06T2201/0065
Inventor 钱阳周立波袁晓东
Owner 江苏水印科技有限公司