Digital Image Spread Spectrum Watermarking Algorithm Based on DCT-SVD for Anti-geometric Attacks
Qianan Fang · 2013
A spread spectrum watermarking algorithm based on singular value decomposition(SVD) has proposed.The original image block was transformed in DCT block,then SVD decomposition,the singular value.Watermark adopts repetition code,and pseudo-random generator generates a pseudo-random sequence with a secret key to spread spectrum the watermark.Watermark embedding is achieved by modifying the maximum singular value.And combine with a model of the human visual system to balance these two main performance indicators of the robustness and transparency of the watermark.The experiments show that,due to the use of spread spectrum technology,the watermark extraction accuracy rate is very high,with good robustness to noise,filtering,compression and shear.For spin attack,it makes the watermark extraction accuracy rate greatly improve by estimating the angle of rotation,the use of spread spectrum technology and SVD.