In this paper

a digital image watermark algorithm based on wavelet transform and compound chaotic system is presented.During the embedding of the watermarking

discrete wavelet transform is done firstly and low frequency part is extracted as the embedding field.Secondly

there is a measure to encrypt the watermark by using the compound chaotic sequence

and then we transform the encrypted part and extract the low frequency.Finally

we embed the low frequency part into the original image.This paper mentions a me...