Modified scheme for Lossy Compression and Iterative Reconstruction for Encrypted Image
Asha Pandit Ghodake, Sujata D. Mendgudle, Navi Mumbai · 2012
This paper presents advanced scheme for lossy compression of an encrypted image with flexible compression ratio. Encryption of original image is obtained by using pseudorandom permutation. Then encrypted image is compressed by using orthogonal transform and then the excessively rough and fine information in the coefficients is removed, leading to a reduced data amount. After receiving the compressed image, receiver can reconstruct the principle contents of original image by iteratively updating the values of coefficients. For this process flexible compression ratio is used. The compression ratio and the qualities of the reconstructed image are dependent on the values of compression parameters. Higher the compression ratio and the smoother the original image, the better the quality of the reconstructed image. The proposed scheme significantly improves the compression efficiency.