Abstract: In this paper,an image watermarking algorithmis proposed based on DCT and Arnold transform.Firstly,the algorithm uses Arnoldtransform to process the watermarking image.Then processes the vector image byDCT transform of 8×8.Experimental results show that the embed watermark can bestill extracted from the vector when the watermark image is attacked by different ways,such as white noise,low pass filtering,compression,shear,rotation,etc.Therefore,this algorithm has a good robustness against watermark attacks.Especially,it has a very effective capacity against the shear.In addition,the algorithm has high security and good real-time feature.

Key words: Arnold transform, DCT transform, image watermark