Spread spectrum watermarking algorithm based on compound chaotic sequence
一种基于复合混沌序列的扩频水印算法

This paper put forward a robust spread spectrum algorithm with high safety in DWT(discrete wavelet transform)domain.Permuted watermark by Arnold transformation,then encrypted and spread based on compound chaotic binary sequence.And presented a method of fixing quantization step adaptively in DWT domain.Embedded binary watermark bits in frequency domain through odd-even quantization.The use of compound chaotic keys and privacy of modification on coefficients of DWT domain enhanced the security of watermarkin...