Image matching between scrambled images for secure data management
Hitoshi Kiya, Izumi Ito · 2008
We propose a scrambling method for image matching using phase-only correlation (POC) or discrete cosine transform sign phase correlation (DCT-SPC). The proposed scrambling method distorts only the phase, which has significant infor-mation of images. The information in each image is pro-tected by the distorted phase information. In addition, syn-chronized scrambling keeps the relative relation between im-ages. Therefore, either POC or DCT-SPC can be directly ap-plied to the scrambled images in order to estimate the trans-lated, rotated, and scaled values. Moreover, the proposed scrambling does not affect the accuracy of estimation values. 1.