DCT Sign-Only Correlation with Application to Image Matching and the Relationship with Phase-Only Correlation
Izumi Ito, Hitoshi Kiya · 2007
A close relationship between the sign information of discrete cosine transform (DCT) coefficients and the phase term of discrete Fourier transform coefficient is explained. From this relationship, the DCT sign-only correlation is proposed and its relationship with the phase-only correlation (POC) is considered. As a result, the proposed correlation can be applied to applications based on the POC, and also provide a theoretical explanation of target image search and retrieval using the sign information of DCT.