Image encryption compression and decryption decompression method

Abstract

The present invention discloses an image encryption compression method. The image encryption compression method comprises: generating a random sequence, wherein the number N of the elements in the random sequence satisfies 60<=N<=360, and the value range of each element is 0-360; and taking each element in the random sequence as a projection angle, and employing the radon conversion to perform projection compression of the image to be projected according to the corresponding projection angle, and taking the compression result as the encryption compression result of the image. According to the application, the image encryption compression and decryption decompression method can avoid influencing the image compression efficiency while realizing image encryption.

Description

technical field [0001] This application relates to image processing technology, in particular to an image encryption compression and decryption decompression method. Background technique [0002] Due to the development of digital signal acquisition technology, the amount of information carried by image data is increasing. The first issue that needs to be considered is how to reduce the occupied bandwidth resources and ensure the security during transmission. An effective means to deal with this problem is to compress and encrypt the image at the same time. [0003] According to the order of encryption and compression technology, the current research on image compression and encryption technology can be divided into three categories: (1) first compress the image and then encrypt it; (2) first encrypt the image, and then encrypt the encrypted ciphertext image Compression (3) Compression is performed jointly with encryption. In the first type of first compression and then enc...

AI Technical Summary

Problems solved by technology

In the first type of first compression and then encryption processing, the original image compression method, such as the existing image format gif, png, jpeg and other compression algorithms, can be used to compress the image to obtain the compressed data stream, and then To encrypt it, but in this type of algorithm, encryption will destroy the structure of the original compressed data. When the decryption key is incorrect, when the image is decompressed and restored, the wrong image with the same size as the original image will not be obtained. The decompression operation cannot be performed

Although this method achieves image compression to a certain extent and ensures the security of image information, it does not conform to the encryption and decryption mechanism in cryptography.

In the second type of first encryption and then compression processing, since the encryption of the image will destroy the correlation between the image pixels, the effect of the compression is not obvious, and it will not greatly reduce the memory occupied when storing or transmitting the image. resource

In some image compression and encryption methods, the transformed frequency domain data is encrypted and then compressed. In general, the compression effect will be affected.

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