Abstract: A new robust digital image watermarking technique is proposed.Generating watermark process uses conversion，scrambling and extension to original watermark.Embedding process embeds watermark in approximation image of original image in wavelet domain，and the embedded intensity of watermark is determined adaptively by noise visibility function.Extraction process adopts independent component analysis and doesn’t need any information about original image and original watermark.The experimental results show that this method has a good robustness to the popular watermark benchmarking software Checkmark.