CvMat convertTo operation

[Hans-Christian Sperker]

Hey there,

in openCV it is possible to change the type of a cv::Mat via
Mat::convertTo(...) now I am looking to this possibility in javaCV.
But on CvMat there isn't an operation convertTo. How can I convert the
type then?

Thanks!

[Samuel Audet]

I think you're looking for cvConvertScale():
http://docs.opencv.org/modules/core/doc/old_basic_structures.html#void%20cvConvertScale%28const%20CvArr*%20src,%20CvArr*%20dst,%20double%20scale,%20double%20shift%29

Samuel

[Hans-Christian Sperker]

Hmm I would like to use the convertTo(...) like in http://find-object.googlecode.com/svn-history/r55/trunk/find_object/example/main.cpp 

where it is used to convert some CvMat to CV_32F. See code:

if(sceneDescriptors.type()!=CV_32F) {

    sceneDescriptors.convertTo(sceneData, CV_32F); // make sure it's CV_32F

}

How would I do this with cvConvertScale?

2012/7/28 Samuel Audet <samuel...@gmail.com>:

[Samuel Audet]

On 2012-07-31 02:20, Hans-Christian Sperker wrote:
> Hmm I would like to use the convertTo(...) like in
> http://find-object.googlecode.com/svn-history/r55/trunk/find_object/example/main.cpp
>
> where it is used to convert some CvMat to CV_32F. See code:
>
> if(sceneDescriptors.type()!=CV_32F) {
> sceneDescriptors.convertTo(sceneData, CV_32F); // make sure it's CV_32F
> }
>
> How would I do this with cvConvertScale?

In almost the same way:
sceneData = CvMat.create(..., CV_32F, ...);
cvConvert(sceneDescriptors, sceneData);

[Hans-Christian Sperker]

Thank you Samuel, seems to work ;-)

2012/7/31 Samuel Audet <samuel...@gmail.com>