Research On Medical Image Compression And Encryption Technology Based On Cloud PACS

As an important basis for disease diagnosis,medical imaging has been widely used in people’s medical life.At the same time,the growing medical level has higher and higher requirements on the quality of medical images.However,the huge amount of medical image data imposes a huge storage burden on Picture Archiving and Communication Systems(PACS).In view of this,a cloud PACS system that stores medical image data in a cloud server came into being.The cloud PACS system not only realizes the interconnection of hospitals,expands the storage space,but also improves the storage life of medical image data.However,in the cloud PACS system,there are still problems of insufficient storage space and transmission bandwidth for the medical image data that grows exponentially.At the same time,there is also the security problem of medical image leakage during the transmission process.This paper takes cloud PACS as the application background,and studies the compression and encryption of medical image data.The main research contents are as follows:1)Aiming at the problem of occupying transmission bandwidth and storage space caused by the large amount of medical image data,a medical image compression algorithm based on variational autoencoder is proposed.The algorithm regards rate and distortion as the common optimization objectives and uses the residual network module to directly transmit information,which alleviates the contradiction between improving compression efficiency and optimizing reconstruction effect and reduces the information loss of medical images during the compression process.The experimental results show that the algorithm proposed in this paper can achieve better reconstruction effect than the algorithm based on super-prior under the same compression degree.2)Aiming at the problem of medical image leakage during transmission,a hyperchaotic system encryption algorithm based on DNA encoding is proposed.The algorithm upgrades a three-dimensional chaotic system to a four-dimensional hyper-chaotic system,and uses the chaotic sequence generated by the four-dimensional hyper-chaotic system to determine the sequence and rules of DNA coding.Then,the chaotic sequence generated by the one-dimensional insect population mapping is used to replace the encoded sequence encoded by the DNA to obtain an encrypted image.Simulation experiments show that the algorithm has good encryption effect,large key space,strong key sensitivity and good anti-noise performance.