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The 2D to 3D conversion technique plays a crucial role in the development and promotion of three-dimensional television (3DTV) for it can provide adequate supply of high-quality 3D program material. In this paper, a novel automatic 2D to 3D conversion method using multi-depth cues is presented. The depth cues used in our system, which will be integrated into one depth map according to the types of the 2D scenes, include perspective geometry, defocus, visual saliency and adaptive depth models. After the depth maps are extracted, the original 2D image or video is converted to stereoscopic one for showing on 3D display devices. Our method is verified on various sequences and the experimental results show that the resulting image or video is both realistic and visual pleasing.