Correction method for fisheye image distortion

The invention discloses a correction method for fisheye image distortion. The method includes the following steps that firstly, a fisheye image of a standardized test grid plate and an actual image of the fisheye image are obtained; secondly, distortion measurement is conducted on the obtained fisheye image, and distortion coefficients are calibrated according to a polar coordinate model; thirdly, correction is conducted according to a correction model, and in order to guarantee correction precision, sectioned correction is conducted according to a central view field, a middle view field and an edge view field during correction; fourthly, pixels obtained after spatial alternation are endowed with corresponding gray values through a bilinear interpolation method so that the gray value of an original position can be restored. Reverse operation is simple, measurement precision is high, and the correction method is easily achieved in hardware systems such as an EPGA and a DSP. The correction method has high practical value.