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A Scrambling Method for JPEG Coded Images Enabling Image Retrieval from Scrambled Images
Ryo HOSAKA,Fitri Arnia,Masaaki FUJIYOSHI,Hitoshi KIYA 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper proposes a scrambling method for JPEG coded images and an image retrieval method for scrambled JPEG images. The proposed scrambling and retrieval methods utilizes the positive and negative sign of discrete cosine transformed coefficients. The proposed method scrambles a JPEG coded image without decoding the JPEG codestream. Moreover, this proposed method never changes the coding efficiency by scrambling. The proposed retrieval method compares a query image and scrambled images without descrambling and without decoding. This method is able to retrieve the same image as the query image but with the different compression ratio. Simulation results show the effectiveness of the proposed method.