Convert boost array to open cv mat

Question

I try to convert a boost::array rightCamInfo.K to an opencv Mat cv::Mat K. I didn't found any functions for this setting so I wrote an iterative approach:

float tempK[9];
cv::Mat K;
for (int i = 0; i < 9; i++) {
   tempK[i] = rightCamInfo.K[i];
}
K = cv::Mat(3, 3, CV_64F, &tempK);

But this is giving me strange results. The range of the given data is between 400 and 0 and the result matrix is around 5 * 10^(-315). So obviously there are some conversion errors. What is wrong? Did I chose the wrong type for the matrix or does this array type is not fitting?

smttsp · Accepted Answer · 2016-05-16 12:31:25Z

6

You should use CV_32F not CV_64F and point the first element of tempK

K = cv::Mat(3, 3, CV_32F, &tempK[0]);

or

Mat K(3, 3, CV_32F, &tempK[0]);

answered May 16, 2016 at 12:31

smttsp

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2 Comments

BeJay Over a year ago

Such a small thing but it works. Thanks. Can you shortly explain why this is making a difference?

smttsp Over a year ago

CV_32F (32 bit) says the byte I'm reading now is float whereas CV_64F says it is double (64 bit). When you try to read with CV_64F, you try to read a float value as if it is double.

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