Signal processing applications dealing with secure transmission are enjoying increasing attention lately. This paper provides some theoretical insights as well as a practical solution for transmitting a hash of an image to a central server to be compared with a reference image. The proposed solution employs a rigid image registration technique viewed in a distributed source coding perspective. In essence, it embodies a phase encoding framework to let the decoder estimate the transformation parameters using a very modest amount of information about the original image. The problem is first cast in an ideal setting and then it is solved in a realistic scenario, giving more prominence to low computational complexity in both the transmitter and receiver, minimal hash size, and hash security. Satisfactory experimental results are reported on a standard images set.

中文翻译：

---

用于安全图像基于哈希的几何变换估计的最少信息交换

近来，涉及安全传输的信号处理应用受到越来越多的关注。本文提供了一些理论见解以及将图像的哈希值传输到中央服务器以与参考图像进行比较的实用解决方案。所提出的解决方案采用了从分布式源编码角度来看的刚性图像配准技术。本质上，它体现了一个相位编码框架，使解码器可以使用有关原始图像的非常少量的信息来估计转换参数。首先在理想的环境中解决该问题，然后在实际情况下解决该问题，使发送方和接收方的计算复杂度较低，哈希大小最小以及哈希安全性更为突出。