C语言实现去畸变，不依赖opencv。

opencv 仅起读图和显示，去畸变部分是纯c。

#include 
#include 
#include 
#include 
#include
using namespace cv;
using namespace std;


int main()
{
    Mat image = cv::imread("test.png");
    int rows = image.rows, cols = image.cols;
    Mat image_undistort = Mat(rows, cols, CV_8UC3);
//begin
    double fx = 1761.11838;
    double fy = 1764.23318;
    double cx = 1252.36929;
    double cy = 726.936342;
    double k1 = -0.42143775;
    double k2 = 0.213623709;
    double p1 = 0.000174992651;
    double p2 = 0.0000262047557;
    double k3 =-0.0564630091;
    for (int v = 0; v < rows; v++)
        for (int u = 0; u < cols; u++) {
            double u_distorted = 0, v_distorted = 0;
            double x1, y1, x2, y2;
            x1 = (u - cx) / fx;
            y1 = (v - cy) / fy;
            double r2;
            r2 = pow(x1, 2) + pow(y1, 2);
            x2 = x1*(1 + k1*r2 + k2*pow(r2, 2)+ k3*pow(r2, 3)) + 2 * p1*x1*y1 + p2*(r2 + 2 * x1*x1);
            y2 = y1*(1 + k1*r2 + k2*pow(r2, 2)+ k3*pow(r2, 3)) + p1*(r2 + 2 * y1*y1) + 2 * p2*x1*y1;
            u_distorted = fx*x2 + cx;
            v_distorted = fy*y2 + cy;
//finish
            if (u_distorted >= 0 && v_distorted >= 0 && u_distorted < cols && v_distorted < rows) {