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Combined image compression/encryption method based on compressed sensing

An image compression and encryption method technology, applied in the field of image processing, to achieve the effect of ensuring reversibility, improving anti-attack performance and robustness, and increasing image encryption performance

Active Publication Date: 2013-01-23
瑞金市工业投资发展有限公司
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Problems solved by technology

The basis pursuit (BP) algorithm uses the l1 norm instead of the l0 norm to transform the problem into a convex Optimization problem solving, similar to the FOCUSS system, but it uses the lp norm (p < 1), at this time the problem is no longer a convex problem, and it is easy to fall into a local minimum

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  • Combined image compression/encryption method based on compressed sensing
  • Combined image compression/encryption method based on compressed sensing
  • Combined image compression/encryption method based on compressed sensing

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Embodiment Construction

[0048] The present invention will be further described below in combination with specific implementation methods and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0049] 1) order M Take the empirical value to meet the basic requirement that the number of image sub-blocks in the training set is greater than 10,000. When the type of image is single, for example, when performing satellite cloud image data compression, CT and MRI image compression, or face image or even human mouth shape image compression, the image sub-blocks in the training set can be smaller, and then M The value can also be smaller.

[0050] Extract n 8×8 image blocks from a clean training image set, n is about 10,000, use KSVD algorithm and batch orthogonal matching pursuit algorithm to train a general dictionary D with a size of 64×2000, and output the dictionary.

[0051] 2) Input the picture to be processed, divide the picture to be processed in...

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Abstract

The invention discloses a combined image compression / encryption method based on compressed sensing, which comprises the following steps of: firstly, a dictionary is formed by combining sub dictionaries obtained by classifying and training by combining a K-SVD method; secondly, an improved orthogonal matching pursuit algorithm is adopted in sparse coding; and finally, encryption is embedded in a compression process so that an encryption / compression algorithm of an image is realized. According to the invention, encryption and compression are tightly linked, therefore, on the premise of no basic influence to rate distortion performance, the attack resistance property and the stability of a system are further improved, the rate distortion performance of static image compression is superior to that of international main trend algorithms such as JEFG2000 and SPIHT at present, the image encryption performance is increased, and common attacks such as cipher text-only attack, chosen-ciphertext attack, known-plaintext attack and chosen-plaintext attack can be resisted. The invention can be used in image storage and transmission in the information security transmission fields such as internet, mobile telephones and video conferences.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image compression / encryption method. Background technique [0002] With the rapid development of network technology and multimedia technology, multimedia data has gradually become an important source of information for people and an important part of people's lives. How to transmit a large amount of multimedia information and protect its security has become a hot topic in international research. Digital image compression technology and digital image encryption technology emerged as the times require, and are widely used in various fields such as multimedia, communication, and medicine. [0003] The traditional method of image transmission is to first compress and remove redundant information, and then encrypt on the already compressed image format, such as Advanced Encryption Standard (AES), or encrypt the image first, and then compress it independently by the networ...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50
Inventor 吴建华吴燕周南润张烨
Owner 瑞金市工业投资发展有限公司
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