Image encoding method for preventing and identifying image tamper

Abstract

The invention discloses an image coding method for preventing and identifying image tampering. The data of original image coding is encrypted by a key and circulating redundancy check coding (CRC) is carried out on the encrypted data; then scrambling encryption is carried out the encrypted data of the original image coding and the circulating redundancy check coding by keys; and then the encrypted data of the original image coding and the circulating redundancy check coding are added to display image coding (non-encrypted image coding), thereby preserving the information of the safe and true original image into the image so as to prevent and identify image tampering, in this way, the coding of one image consists of two parts: the display image coding and the encrypted original image coding; the display image coding can be any form of image compression coding and allows any form of operation on the display image; the original image can be intuitively observed by carrying out decryption on the encrypted original image coding; comparison is carried out on the original image and the display image, thus being capable of intuitively observing the alternation carried out on the original image. The image coding method has the advantage of identifying the image tampering in direct contrast with the original image, thus being convenient for people to judge whether the correction on the image affects the authenticity of the content of the image or not and being capable of accurately resuming the image after tampering to the original image. The image coding method is simple in arithmetic, is easy to realize hardware coding and software coding, can be used for validating the authenticity of court evidence and e-business pictures as well as resuming the tampered image and image steganalysis.

Description

Technical field: [0001] The invention relates to an image encoding method for preventing and identifying image tampering, which is used for digital image authentication, that is, verifying the authenticity of the digital image and restoring the tampered image to the original image. Background technique: [0002] In recent years, with the development of computer technology and image processing technology, especially some cutting-edge image processing software such as the powerful Photoshop image processing software produced by Adobe, it has become very easy to create fake images that are indistinguishable from real images , especially with the popularity of the Internet, a large number of forged images spread rapidly on the Internet, which has a serious impact on our society. In addition, in some applications such as news pictures, e-commerce pictures and court evidence pictures, people need to know exactly what Whether the pictures received or used are authentic and credible...

AI Technical Summary

Problems solved by technology

Compared with digital watermarking, this method does not require any operation on the original image, but because digital images usually generate noise in the process of digitizing continuous images, and the process of image compression is usually lossy compression, it will also change Statistical characteristics of images, compression methods are also various, such as the previous JPEG using discrete cosine (DCT) transform and JPEG2000 using wavelet transform, different compression methods lead to changes in image statistical characteristics are not the same, therefore, resulting in statistical characteristics There are many reasons for the change, and it is very difficult to detect tampering with complete accuracy

In addition, this method can only detect image tampering, but cannot restore the tampered image to the original image

[0005] In addition to the inability to accurately restore the original image, the above two methods have a common disadvantage that some acceptable operations on the image are usually not allowed, such as brightness adjustment, contrast adjustment and other operations that do not change the image content, because these operations are Will be regarded as tampering with the image, but often these common operations are necessary

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