Robust reversible information hiding method and system based on polar harmonic Fourier moment

The invention provides a robust reversible information hiding method and system based on polar harmonic Fourier moments, and relates to the technical field of information hiding, an original carrier image is mapped to a unit circle under polar coordinates, the polar harmonic Fourier moments of all areas in the unit circle are calculated, and a polar harmonic Fourier moment set is obtained; based on the integer part and the decimal part of the separated polar-harmonic Fourier moment, embedding secret information into a polar-harmonic Fourier moment set, and reconstructing to obtain an intermediate image; the error generated in the secret information embedding stage and the hash value of the intermediate image serve as compensation information and are embedded into the intermediate image, and a final secret-carrying image is obtained; according to the method, based on the polar harmonic Fourier moments, a two-stage embedding mode is adopted, secret information is embedded into the low-order polar harmonic Fouri