Format-Compliant Perceptual Encryption Method for JPEG XT
Format-Compliant Perceptual Encryption Method for JPEG XT
复制标题
JPEG XT 格式兼容的感知加密方法
DOI：
10.1109/icip.2019.8803623
复制
发表时间：
2019
期刊：
影响因子：
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通讯作者：
Simying Ong
中科院分区：
文献类型：
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作者：
Jeffrey Ting;Koksheik Wong;Simying Ong
高动态范围 (HDR) 图像允许在数字图像中看到更多细节，其中较暗（例如阴影）和较亮（例如天空）区域中的物体变得更加可见。因此，越来越多的设备具备HDR成像拍摄能力。在这项工作中，提出了一种对以 JPEG XT 标准编码的高动态范围图像进行加密的方法。为了实现扩散，基础层中的 DC 系数被分成不同大小的组。类似地，基础层和残差层中的AC系数以（零游程大小，值）对的形式进行混洗。我们的加密方法能够实现：(a) 抑制比特流大小扩展，(b) 充分掩盖 HDR 图像的视觉外观，以及 (c) 格式兼容。实验验证了该方法的基本性能。在最好的情况下，HDR 图像可以完全扭曲以掩盖其感知语义，同时文件大小略有减小。
High dynamic range (HDR) image allows more details to be seen in a digital image, where objects in the darker (e.g., shadow) and brighter (e.g., sky) regions are made more visible. Therefore, there is an increasing number of devices that include the HDR imaging capturing capability. In this work, a method is put forward to encrypt high dynamic range image encoded in the JPEG XT standard. To achieve diffusion, DC coefficients in the base layer are shuffled in groups of variable sizes. Similarly, AC coefficients in the base and residual layers are shuffled in the form of (zero-run-size, value) pair. Our encryption method is able to achieve: (a) suppression of bit stream size expansion, (b) sufficiently mask the visual appearance of an HDR image, and (c) format-compliant. Experiments are carried out to verify the basic performance of the proposed method. In the best case scenario, an HDR image can be completely distorted to mask its perceptual semantics with slightly reduced file size.