空洞填充

#include <opencv2/opencv.hpp>      
using namespace std;
using namespace cv;
Mat fillHold(const cv::Mat src)
{
    // Fim_thloodfill from point (0, 0)
    Mat im_floodfill = src.clone();
    floodFill(im_floodfill, cv::Point(0, 0), Scalar(255));
    // Invert floodfilled image
    Mat im_floodfill_inv;
    bitwise_not(im_floodfill, im_floodfill_inv);
    // Combine the two images to get the foreground.
    Mat im_out = (src | im_floodfill_inv);
    return im_out;
}



void fillHole(const Mat srcBw, Mat &dstBw)
{
    Size m_Size = srcBw.size();
    Mat Temp = Mat::zeros(m_Size.height + 2, m_Size.width + 2, srcBw.type());//延展图像  
    srcBw.copyTo(Temp(Range(1, m_Size.height + 1), Range(1, m_Size.width + 1)));

     floodFill(Temp, Point(0, 0), Scalar(255));

    Mat cutImg;//裁剪延展的图像  
    Temp(Range(1, m_Size.height + 1), Range(1, m_Size.width + 1)).copyTo(cutImg);

    dstBw = srcBw | (~cutImg);
}

int main()
{
    Mat img = imread("a.jpg");

    Mat gray;
    cvtColor(img, gray, CV_RGB2GRAY);

    Mat bw;
    threshold(gray, bw, 0, 255, CV_THRESH_BINARY | CV_THRESH_OTSU);

    Mat bwFill;
    fillHole(bw, bwFill);

    imshow("填充前", gray);
    imshow("填充后", bwFill);
    waitKey();
    return 0;
}