Abstract
In order to protect data privacy, image with sensitive or private information needs to be encrypted before being outsourced to the cloud. However, this lead to difficulties in image retrieval. A secure JPEG image retrieval method is proposed in this paper. Image is encrypted on DCT (Discrete Cosine Transform) domain by scrambling encryption, and the encrypted image is outsourced to the server, then the DC difference histogram and LBP (Local Binary Patterns) among the image blocks are extracted as image feature vectors by the server. Both the image confidentiality and retrieval accuracy are guaranteed in the proposed method with less computational complexity and communication cost. Experimental results prove that the proposed scheme has good encryption security and can achieve better retrieval performance.
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