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Paradigms of Image Compression and Encryption: A Review

Image compression is a process of reducing size of an images at the time of transmission and at network level we also need some security mechanism for secure data transmission assurance. To provide data security we need a best encryption method for an image so that it does not affect image quality. The image compression schemes are of two types lossy and lossless or combination of both. The both (lossy and lossless) compression schemes can compress and decompress the image but some time compression made some loss of data so it is lossy otherwise lossless. To provide security as we know perform encryption and decryption process, there are two methods for key generation one is symmetric and other asymmetric. If we use same key for encryption and decryption i.e., known as symmetric system otherwise asymmetric cryptography system.In this paper, a detailed review of different Compression and Encryption schemes like CE, EC, Joint compression and Encryption is given and we also analyzed their result on the basis of different parameter like compression ratio, PSNR, NPCR, UACI etc.