Joint Compression-encryption Algorithm for ROI Image Based on EZW
Deng Xiao-Mei · Video Engineering · 2013
A joint compression-encryption algorithm based on EZW coding is proposed.The principle of the context modification and the decision modification described.Finally,the security and usability of the algorithm is analyzed and evaluated.The simulation results show that the proposed ROI image joint compression-encryption algorithm has the same compression efficiency compared with the original image compression algorithm.Compared with the methods of the lifting ROI'coefficient,the algorithm can adjust flexibly the quality of reconstructed image between ROI and background region(BG),without coding for ROI shape.And the proposed algorithm,based on adaptive arithmetic coding,has better security than the joint compression-encryption algorithm based on the interval splitting.In order to meet different application,different keys are used to encrypt separately the different wavelet resolution coefficients during bit-plane coding,to make sure the resolution selective encryption is realized.