Image Watermarking Based on Discrete Cosine Transformation and Doubly Stochastic Matrix

This novel DCT-based approach has three keys,the doubly stochastic matrix along with its coefficients are used to embed watermarking and play the role of private keys,while summation of transformation matrix of watermarking serves as public key.Its detection process is composed of two parts：one needs secrete key,while the other only needs public key.When both parts are correct,the detected image restores the original watermarking.