问inpaint()不会产生预期的结果。为什么？

EN

#include "opencv2/highgui.hpp"
#include "opencv2/photo.hpp"

#include <iostream>

using namespace cv;
using namespace std;

int main(int args, char** argv)
{
   //Read the image
   Mat img = imread("/Desktop/apple.png", -1);
   //create inpaint mask the size of original image
   Mat inpaintMask = img.clone();
   //convert mask from rgb to gray
   cv::cvtColor(inpaintMask, inpaintMask, cv::COLOR_RGB2GRAY);
   // convert mask from gray to binary by thresholding, you can play with 170 and 255 args to achieve desired mask
   cv::threshold(inpaintMask, inpaintMask, 170, 255, cv::THRESH_BINARY);
   Mat inpainted;
   //finally call inpaint function and pass the args
   inpaint(img, inpaintMask, inpainted, 3, INPAINT_TELEA);

   imshow("image", img);
   imshow("mask", inpaintMask);
   imshow("inpainted image", inpainted);
   cv::waitKey(0);
}