Abstract Thanks to the rapid development of the software and hardware of computer, the application of computer vision technology on mobile phone becomes imaginable. One of the cross point between the vision technology and mobile phone is to use this technology to enhance the human machine interaction ability of the mobile phone. At present, there are many such systems, such as gesture and face recognition on mobile device. The basic drawbacks of these application is its high compute complicity and sometimes it require an on board camera. So the compute ability of the cpu must meet the task and the capability of the phone’s battery must be high. Our contribution is based on two works: The first is a document image mosaic system based on mobile platform,this System can mosaic pieces of small document images into large panorama image. It extends the camera function on the phone. When a user has seen a piece of text he wants to save it and read in the future. But the view angle of the on board camera is narrow, so it is very difficult to get a clear image in one shot. Use our system the user only need to capture part of the document. He can scan the document use the on board camera to get large set of the document image. We help the user to mosaic these images into one. In the second work, we present a novel virtual mouse system for mobile phones. The system is based on computer vision techniques. It first captures an image using the camera of the mobile phone, then extracts feature points of the scene and tracks them. By using this algorithm we can estimate the camera motion and give the translation vector to our virtual mouse interface. We use NOKIA 6630 camera phone as the developing platform which has a Mega Pixel camera on the back of it. The experiments show the promising results. The on board camera is used to capture the scene frame by frame, and then pixel correlation method is used to get the displacement vector. When users move the phone, the scene’s motion is opposite to that of the phone. keywords:virtual mouse, image mosaic, scale-space, SIFT, K-d tree, motion estimation ;
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