Iris watermark generation method and device

The invention provides an iris watermark generation method and device. The iris watermark generation method comprises the following steps: determining an iris area from an original iris image I, and obtaining the round inner edge profile Cpu and the round outer edge profile Cir of the iris area; determining a sampling angle range theta, a sampling width ratio coefficient epsilon, a longitudinal sampling point number n and a lateral sampling point number m, and calculating an initial sampling angle alpha; according to the initial sampling angle alpha, the sampling angle range theta, the sampling width ratio coefficient epsilon, the longitudinal sampling point number n and the lateral sampling point number m, determining a rectangular discrimination area A on the original iris image I; determining an edge on the rectangular discrimination area A, carrying out shelter judgment, and updating the initial sampling angle alpha; selecting the rectangular discrimination area A without a shelter to generate a sampling