How to apply noise in frames video ?

noise

asked 2018-06-21 12:13:44 -0600

azdoud.y
71 ●1 ●2 ●8

updated 2020-10-05 05:22:38 -0600

sturkmen

6772 ●3 ●48 ●79 https://github.com/stu...

Hello,

I have seen the video of Megamind.avi and it noisy version Megamind_bugy.avi you can find them within OpenCV directory opencv/samples/data/

I want to apply the same noise on my list of video as well to test my code

thank you

edit retag flag offensive close merge delete

Comments

that's not exactly "noise", but random (rotated) rectangle overlays.

for "salt&pepper" noise, look at cv::randu() / cv::randn()

berak ( 2018-06-21 12:16:48 -0600 )edit

add a comment

1 answer

Sort by » oldest newest most voted

answered 2018-06-21 18:10:33 -0600

sjhalayka

1170 ●4 ●18

updated 2018-06-21 18:11:31 -0600

A code to take a 2D mat of type CV_32FC1 and add noise to it:

void add_noise(Mat &mat, float scale)
{
    for (int j = 0; j < mat.rows; j++)
    {
        for (int i = 0; i < mat.cols; i++)
        {
            float noise = static_cast<float>(rand() % 256);
            noise /= 255.0f;

            mat.at<float>(j, i) = (mat.at<float>(j, i) + noise*scale) / (1.0f + scale);

            if (mat.at<float>(j, i) < 0)
                mat.at<float>(j, i) = 0;
            else if (mat.at<float>(j, i) > 1)
                mat.at<float>(j, i) = 1;
        }
    }
}