OpenCV计算水平线中的像素数

Question

I wish to find number of white pixels in every row of binary image. And if that count is greater than 90, I wish to delete the entire row by changing each pixel value in that row to 0. The code that I wrote is not working. And apparently, I am getting the same binary image at output. Please help me out in fixing the problem. BTW, am using openCV 2.0.

using namespace std;

double a = 15;

double b = 255;

Mat I1;

int main(int argv, char **argc)

{

    cv: Mat I = imread("abc.bmp");

    if (I.empty())

    {

        std::cout << "!!! Failed imread(): image not found" << std::endl;

    }

    threshold(I, I1, a, b, THRESH_BINARY);


    int r = I.rows;

    int c = I.cols;

    for (int j = 0; j < r; j++)

    {

        int count = 0;

        for (int i = 0; i < c; i++)

        {

            if (I1.at<uchar>(j, i) == 255)

                count = count + 1;

        }

        if (count > 90)

        {

            for (int i = 0; i < c; i++)

                I1.at<uchar>(j, i) = 0;

        }

    }
    namedWindow("Display window", 0);// Create a window for display.

    imshow("Display window", I1);


    waitKey(0);

    return 0;
}

Answer 1

By default imread returns 3 channel BGR image. If you want to load grayscale/binary image use cv::IMREAD_GRAYSCALE parameter:

cv::Mat I = cv::imread("abc.bmp", cv::IMREAD_GRAYSCALE);