CODEWITHSUNDEEP
c++opencvmatrixmat
hihihowru
hihihowru

Reputation: 55

Error when creating a 4x4 mat matrix in opencv

I am trying to create a 4x4 matrix with cv::Mat(4,4,CV_64F, data_m);, where data_m is a float array

float data_m[] = {rmatrix.at<float>(0,0),rmatrix.at<float>(0,1), rmatrix.at<float>(0,2), tvec[0],rmatrix.at<float>(1,0), rmatrix.at<float>(1,1), rmatrix.at<float>(1,2), tvec[1], rmatrix.at<float>(2,0), rmatrix.at<float>(2,1), rmatrix.at<float>(2,2), tvec[2],0.f ,0.f ,0.f, 1.f};

and rmatrix is a 3x3 matrix, tvec is a 3x1 vector.

However, when initializing translation_m 

cv::Mat translation_m = cv::Mat(4,4,CV_64F, data_m);

the last eight elements were not successfully initialized in translation_m matrix. It returns some weird alien number like 4.59121e-41.

Does anyone have an insight on what is going on here?

Upvotes: 0

Views: 1084

Answers (1)

Miki
Miki

Reputation: 41776

You're mixing double (64 bit, CV_64F) and float (32 bit, CV_32F). When reading your float array as double your're going after the end of the vector, and you're reading uninitialized data.

Use either:

float data_m[] = ...
cv::Mat translation_m = cv::Mat(4,4,CV_32F, data_m);

or

double data_m[] = ...
cv::Mat translation_m = cv::Mat(4,4,CV_64F, data_m);

Upvotes: 1

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