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Abstract. In this paper, we proposed a method of calibrating the camera of smart phone based on web image. In order to achieve the goal, a website and the corresponding app are built: the website is used for displaying the calibrating pattern; the app is used to grab the image in real time and guide the user to rotate the smart phone so as to acquiring more precise parameters. Although the rough extrinsic parameters can be computed for the guiding procedure, the high computational complexity inhibits it from applying in the app. Instead, due to the regularity of the calibrating pattern-a chessboard, the vanishing points can be obtained by estimating the Intersection of parallel lines. The rotating angle can be roughly estimated by vanishing points. The proposed method can be applied in a number of different applications which need to calibrate the camera.

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