Curved Surface Reconstruction

3D reconstruction from the 2D grey image has been a research hot spot in the filed of computer vision. Making an intensive study on the hot spot, and proposing a method which adopts the contour lines from single image to complete the reconstruction of the rotated curved surface. The method extracts the rotated object as the research target, adopts an adaptive method of Harris corner detection to acquire valid contour lines and their sub-curves, and then acquires the axis of rotated object according to the type of sub-curves and information of characteristic points, combine the geometric properties of rotated object to realize the 3D reconstruction of curved surface. The experiment indicates that the method could conveniently reconstruct the 3D shape of the rotated object according to its 2D grey image.The paper focuses on the following aspects:1,Using a digital camera to obtain image of object is often difficult to meet the requirements of the experiment, in order to enable the result of reconstruction to be the real shape as close as possible , the image should be processed. The processing mainly include image smoothing, noise removal, and the necessary color conversion and threshold segmentation, so that it can extract the rotated object as the research target from a 2D image.2,An adaptive method of Harris corner detection has been introduced, so the valid contour lines required by reconstruction could be determined in accordance with the corners'sequence; Focus on the solution how to use stack technology to assist the eight neighborhood search process to trace the two valid contour lines, and then obtain the sub-curves and their characteristics points;3,The paper mainly takes the rotate object whose generatrix contains circle arc as the research target, and discuss how to identify the type of the sub-curve according to the geometric characteristics, and then focus on the solution how to construct the axis of the rotated object in accordance with the type of the sub-curves;4,The rotated object acquired by camera presents a non-ideal status(not vertical status ), in order to deal with it conveniently, design the related coordinate transformation to correct the object's status to the vertical placement, so that the 3D information could be obtained.5,Making full use of the geometric properties of rotated surface, combine the valid contour lines and axis to acquire the 3D information of the rotated object.6,AS the practice of the theories work of this paper,use OpenGL and VC++ 6.0 to complete 3D reconstruction of rotated surface based on contour lines, and it also provides good interactive operations to users;Meanwhile, in order to embody the integrity of the paper, it introduces the simple operations of 3D graphics rendering process and using mechanisms of OpenGL.