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write a Mat to txt file

Hello All.

I got a border image using Canny function. What Im trying to do is detect a movement using a high pass filter. So applying that filter the border which has a fast changes will still be present. I will read all pixel and find which its "white" (non zero)

image description

That image I got using Canny function.

For for debug it, I means to check that after apply the filter I get white pixel and I have to read that pixel and check the value I do:

    for(int y=0;y<480;y++)
{
    for(int x=0;x<680; x++)
    {
    fprintf(archivo, "%c\t", edges.at<uchar>(x,y));
    }
    fprintf(archivo, "\n");

}

But that doesnt work. Any help here?

Thanks in advance.