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         将一张图像均等分成九份，然后将这九个小块按一定间隔（九宫格效果）拷贝到新画布上。效果如下图所示：

 源码：

#include<iostream>
#include<opencv2/opencv.hpp>
using namespace std;
using namespace cv;int main()
{Mat src = imread("test.jpg");if (src.empty()){cout << "No Image!" << endl;system("pause");return -1;}//原图宽高int width = src.cols;int height = src.rows;int num = 3;//小方块数量(可实现任意等份分割)//制作九宫格每个小方块宽高int step_x = width / num;int step_y = height / num;//重新resize图片尺寸resize(src, src, Size(step_x * num, step_y * num), 1, 1, INTER_LINEAR);int space = 5; //空白间隔(实现九宫格效果)Mat canvas = Mat(Size(src.cols + space * (num-1), src.rows + space * (num - 1)), CV_8UC3, Scalar(255,255,255)); //画布，用来制作九宫格图片//就图片分成9个小块，将每一小块抠图至画布for (int i = 0; i < num; i++){for (int j = 0; j < num; j++){//小方块相对于原图左上角起点int x = j * step_x;int y = i * step_y;//将小方块抠图至画布。其中，每扣一小块需跳过space空白src(Rect(x, y, step_x, step_y)).copyTo(canvas(Rect(x + space * j, y + space * i, step_x, step_y)));//rectangle(src, Rect(x, y, step_x, step_y), Scalar(0, 255, 0), 2);}}imshow("canvas", canvas);imshow("test", src);waitKey(0);system("pause");return 0;
}