[ros-users] cvMat -> ros message

[Patrick Mihelich]

What is the type of the data in your cvMat? I assume it's either float or
double?

Are the publisher and subscriber on the same machine?

I suspect you meant h_m.mat[j*3+k], but that doesn't explain the totally
wrong numbers.

Right before your publish() call, can you print out the contents of h_m.mat
and check that they're correct.

As an aside, the new C++
interface<http://opencv.willowgarage.com/documentation/cpp/introduction.html>to
OpenCV is a big improvement over cvMat/IplImage if you like niceties
like
type safety, automatic freeing of memory and more succinct code.

-Patrick

On Thu, Apr 22, 2010 at 5:52 PM, Dan Lazewatsky
<lazewatskyd at cse.wustl.edu>wrote:

> Hi all -
> I have a cvMat that I'm trying to send out in a ROS message, but I'm
> having some issues getting it to work right.
>
> My message definition is: float64[9] mat
> I'm loading data into the message as follows:
> myMessage h_m;
> for(int j=0; j<3;++j){
>     for(int k=0; k<3; ++k){
>         h_m.mat[j+k*3] = cvmGet(&_h, j, k);
>     }
> }
>
> No errors here, but when I look at the data from a subscriber (or using
> rostopic echo), but numbers are wrong. Numbers that should be in the
> range of 0-10 end up in 10^6-10^-5. I've tried creating a
> std_msgs::Float64 and casting to a Float64 first, neither of which
> worked. I'm at a bit of a loss as to what's going on. Any help would be
> appreciated.
>
> Thanks,
> -Dan
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