How to convert CvMat to cv::Mat and use += operator on cv::Mat object?

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1

Hi,

I want to convert CvMat to cv::Mat. When I google I got to know cvarrToMat() can be used for this. Below is pseudo code that is creating run time error.
Note : I’m using Opencv 4.4 version .

CvMat m ;  // suppose these all variables are initialized.
cv::Mat n ;
cv::Mat p;
cv::Mat q;
n = cvarrToMat(&m); // I want to replace m value of type CvMat to Mat.
q += p.t()*n;  // getting error in this line.

This run time error is belonging to operator in mat.inl.hpp.

I go through almost all available solution that is discussed regarding this on the forums . Please help me to fix this.

Thanks !!

2

please show the error !

(and, in the long run, cvarrToMat() is not a solution,
you will need to replace all the CVMat code, too !)

btw,

p is never initialized in the code you show

3

Hi berak,
Thanks for your quick reply.
Actually I just write a pseudo code. So please assume ‘p’ is also initialized.
Here I paste snippet

IMG_20211014_013048_2
IMG_20211014_013048_21920×1538 392 KB

This question is related to my experiment, it’s originally belongs to my other query I posted on the forum . You can check here.

Please let me know if you found something on this.

Thanks in advance!!

4

screenshots of code or errors are NEVER helpful ANYWHERE
(a debug stacktrace would be …)
((but congrats, looks like you broke the library))

not that this helps, either ;(

5

Could you please suggest other ways how CvMat converts to cv::Mat while using Opencv 4.4 version ? Rather than replacing CvMat by cv::Mat.

6

well, you’ll HAVE TO replace that opencv 1.0 legacy C code. no way around it

we’re at 4.5.4 now

besides that – what about exact code, and a stacktrace ?

7

Thanks for the info.
Sorry , due to some reason , I’m unable to send the code and stack trace.