In this paper, we propose a proxy system with JPEG bitstream-based file-size preserving encryption to securely store compressed images in cloud environments. The proposed system, which is settled between client’s device and the Internet, allows us not only to have exact the same file size as that of original JPEG streams but also to maintain a predetermined image format. In an experiment, the proposed system is verified to be effective in two cloud photo steams: Google Photo and iCloud Photo.
A two-layer image coding method compatible with JPEG XS is proposed. JPEG XS is a new international standard for still image coding that has the characteristics of very low latency and very low complexity. However, the image quality is saturated at a certain quality level in general, although JPEG XS compression may be able to achieve visual lossless coding. The proposed method has a two-layer structure similar to JPEG XT, which consists of JPEG XS coding as the base layer and the extension layer. In an experiment, the proposed coding is demonstrated to outperform JPEG XT in terms of the coding efficiency, while maintaining compatibility with JPEG XS.
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