Remap(

    InputArray src,        // 输入图像

    OutputArray dst,       // 输出图像

    InputArray  map1,      // x 映射表 CV_32FC1/CV_32FC2

    InputArray map2,       // y 映射表

    int interpolation,     // 选择的插值方法，常见线性插值，可选择立方等

    int borderMode,        // BORDER_CONSTANT

    const Scalar borderValue        // color

)

Mat src, dst, map_x, map_y;

const char* OUTPUT_TITLE = "remap demo";

int index = ;

void update_map(void);

int main(int argc, char** argv) {

    src = imread(STRPAHT3);

    if (!src.data) {

        printf("could not load image...\n");

        return -;

    }

    namedWindow(OUTPUT_TITLE, CV_WINDOW_AUTOSIZE);

    map_x.create(src.size(), CV_32FC1);

    map_y.create(src.size(), CV_32FC1);

    int c = ;

    while (true) {

        c = waitKey();

        if ((char)c == ) {

            break;

        }

        index = c % ;

        update_map();

        remap(src, dst, map_x, map_y, INTER_LINEAR, BORDER_CONSTANT, Scalar(, , ));

        imshow(OUTPUT_TITLE, dst);

    }

    return ;

}

void update_map(void) {

    for (int row = ; row < src.rows; row++) {

        for (int col = ; col < src.cols; col++) {

            switch (index) {

            case :

                if (col > (src.cols * 0.25) && col <= (src.cols*0.75) && row > (src.rows*0.25) && row <= (src.rows*0.75))

                {

                    map_x.at<float>(row, col) =  * (col - (src.cols*0.25));

                    map_y.at<float>(row, col) =  * (row - (src.rows*0.25));

                }

                else

                {

                    map_x.at<float>(row, col) = ;

                    map_y.at<float>(row, col) = ;

                }

                break;

            case :

                map_x.at<float>(row, col) = (src.cols - col - );

                map_y.at<float>(row, col) = row;

                break;

            case :

                map_x.at<float>(row, col) = col;

                map_y.at<float>(row, col) = (src.rows - row - );

                break;

            case :

                map_x.at<float>(row, col) = (src.cols - col - );

                map_y.at<float>(row, col) = (src.rows - row - );

                break;

            }

        }

    }

}