[ros-users] Converting Kinect RGB image to OpenCV gives wrong colours
Aslund
sebastian.aslund at gmail.com
Sat Mar 5 14:51:30 UTC 2011
Hey everyone
I have been playing a bit with the kinect camera using the openni driver.
When running openni_node.launch and viewing the rgb image using rviz, then
everything looks perfect, but when I create a node that has to the purpose
to read the rgb image, convert it to a cv image and displaying it using
imshow, then the colours are all wrong. Red is blue, blue is red, green is
something yellow and yellow is light blue. I have been trying to use RGB8
and BGR8 encodings, but nether of them shows any difference.
A sample of my code is shown below, inspired from the example cv_bridge
tutorial<http://www.ros.org/wiki/cv_bridge/Tutorials/UsingCvBridgeToConvertBetweenROSImagesAndOpenCVImages>:
void processRGB::processImage( const sensor_msgs::Image::ConstPtr& img ) {
CvImagePtr cv_ptr;
try {
cv_ptr = toCvCopy(img, enc::BGR8); //enc::RGB8 also used
} catch (cv_bridge::Exception& e) {
ROS_ERROR("cv_bridge exception: %s", e.what());
return;
}
imshow("Kinect RGB image", cv_ptr->image);
waitKey(3);
}
Does anyone know what might cause this problem?
Regards
Sebastian Aslund
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