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Fisheye lens has a big viewing field, with the range between 180° to 270° which works at fixed angle, without spinning. It is widely applied in recent years. However, there is obvious distortion of the image, it is rarely used in the identification of objects. Spherical projection method was used to rectify the image. The method was introduced from the aspects of imaging, projection model, distortion model, bilinear interpolation adjusting etc. The result image has a high resolution, homogeneous illumination distribution suggesting that the method is practical.