Negative values in normalize

[irinagit]

I'm using Ubuntu 13.10 64 Bit, OpenCV master branch.

I get negative values in normalize() function for this example:

    cv::Mat m = (cv::Mat_<float>(20,1)<<
     1888,
     1692,
     369,
     263,
     199,
     280,
     326,
     129,
     143,
     126,
     233,
     221,
     130,
     126,
     150,
     249,
     575,
     574,
     63,
     12);

    cv::normalize(m, m, 0, 400, cv::NORM_MINMAX, CV_32F );
    std::cout << m <<std::endl;

The output is:

[400;
358.20895;
76.119408;
53.518124;
39.872066;
57.142857;
66.950958;
24.946693;
27.931768;
24.307035;
47.121532;
44.562901;
25.159914;
24.307035;
29.424307;
50.533047;
120.04265;
119.82943;
10.8742;
-2.3841858e-07]

[mshabunin]

Possibly rounding problem, try to use double.

[Aravind-Suresh]

Using output format CV_64F also gives the correct/expected output.

[abhiravredox]

I would like to work on this bug. please help me get started as this is my 1st bug!

[Aravind-Suresh]

I tried working on this bug. Let me know if it is correct.

[ysolovyov]

it is still broken

res.create(res_rows, res_cols, CV_64FC1);

cv::matchTemplate(src, tmplResized, res, cfg_.matchingMethod);
cv::normalize(res, res, 0, 1, cv::NORM_MINMAX, -1, cv::Mat());

res contains negative values like -1.19209e-07