#include <opencv2\core\core.hpp> 
#include <opencv2\highgui\highgui.hpp> 
#include <opencv2\imgproc\imgproc.hpp> 
#include <iostream> 
 
using namespace cv; 
using namespace std; 
 
Mat inputImage; 
Mat inputImage_mosaic; 
Mat inputImage_clone; 
 
//馬賽克的大小 
int neightbourhood = 20; 
 
//記錄鼠標的狀態，0為鼠標左鍵未按下或彈起，1為鼠標左鍵按下 
int mouseStatus = 0; 
 
void onMouse(int events, int x, int y, int flag, void* ustg); 
 
//創建馬賽克圖片 
void createMosaicImage(Mat inputMat, Mat& outputMat, int size); 
 
//設置馬賽克區域 
void setMosaic(Mat& inputMat, Rect rect); 
 
int main(void){ 
 inputImage = imread("test2.jpg"); 
 inputImage_clone = inputImage.clone(); 
 createMosaicImage(inputImage, inputImage_mosaic, neightbourhood); 
 
 namedWindow("showImage", 0); 
 setMouseCallback("showImage", onMouse); 
 
 waitKey(); 
 return 0; 
} 
 
void createMosaicImage(Mat inputMat, Mat& outputMat, int size){ 
 RNG rng; 
 int height = inputMat.rows; 
 int width = inputMat.cols; 
 Mat padding; 
 Mat tempMat; 
 
 //為了方便后面的計算，將輸入的圖像大小擴充到寬高都是size的倍數 
 copyMakeBorder(inputMat, padding, 0, size - inputMat.rows % size, 0, size - inputMat.cols % size, BORDER_REPLICATE); 
 tempMat = padding.clone(); 
 
 for (int row = 0; row < padding.rows; row += size){ 
 for (int col = 0; col < padding.cols; col += size){ 
  int rand_x = rng.uniform(0, size); 
  int rand_y = rng.uniform(0, size); 
  Rect rect = Rect(col, row, size, size); 
  Mat roi = tempMat(rect); 
  Scalar color = Scalar(padding.at<Vec3b>(row + rand_y, col + rand_x)[0], \ 
  padding.at<Vec3b>(row + rand_y, col + rand_x)[1], \ 
  padding.at<Vec3b>(row + rand_y, col + rand_x)[2]); 
  roi.setTo(color); 
 } 
 } 
 outputMat = tempMat(Rect(0, 0, width, height)).clone(); 
} 
 
void setMosaic(Mat& inputMat, Rect rect){ 
 Mat roi = inputMat(rect); 
 Mat tempRoi = inputImage_mosaic(rect); 
 tempRoi.copyTo(roi); 
} 
 
void onMouse(int events, int x, int y, int flag, void* ustg){ 
 
 //當鼠標移除圖片區域的時候，不做操作 
 if (x < 0 || x > inputImage.cols || y < 0 || y > inputImage.rows){ 
 return; 
 } 
 
 //馬賽克塊的位置信息 
 int x_left, x_right, y_top, y_bottom; 
 x - neightbourhood <= 0 ? x_left = 0 : x_left = x - neightbourhood; 
 x + neightbourhood > inputImage.cols ? x_right = inputImage.cols: x_right = x + neightbourhood; 
 y - neightbourhood <= 0 ? y_top = 0 : y_top = y - neightbourhood; 
 y + neightbourhood > inputImage.rows ? y_bottom = inputImage.rows: y_bottom = y + neightbourhood; 
 
 if (events == CV_EVENT_LBUTTONDOWN){ 
 mouseStatus = 1; 
 setMosaic(inputImage_clone, Rect(x_left, y_top, x_right - x_left, y_bottom - y_top)); 
 } 
 else if (events == CV_EVENT_MOUSEMOVE){ 
 if (mouseStatus == 1){ 
  setMosaic(inputImage_clone, Rect(x_left, y_top, x_right - x_left, y_bottom - y_top)); 
 } 
 else{ 
  //nothing 
 } 
 } 
 else if (events == CV_EVENT_LBUTTONUP){ 
 mouseStatus = 0; 
 } 
 else { 
 //cout << "nothing" << endl; 
 } 
 imshow("showImage", inputImage_clone); 
}