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Get IR stream from kinect

asked 2011-10-17 20:54:14 -0500

Deby85 gravatar image

updated 2016-10-24 09:03:27 -0500

ngrennan gravatar image

Hi, everybody,

I need to capture the IR stream from IR camera of kinect and I have to use OpenCv Library for analizing it. Doing so, I built a subscriber at the topic camera/ir/image_raw of openni_launch and converted the captured image with cv_bridge::toCvCopy(img, enc:MONO16), but as result I had a really very dark image (almost totally black).

I tried to used the IR camera with command:

rosrun image_view image_view image:=camera/ir/image_raw

and it works properly, so I ask to you: why it doesn't work in my source?

I write below my code:

ros::Subscriber subIRKinect = nh.subscribe("camera/ir/image_raw", 1000, getKinectIRImage);

void getKinectIRImage (const sensor_msgs::ImageConstPtr img)
    //image type mono16
        cv_ptr = cv_bridge::toCvCopy(img, enc::MONO16);
    catch (cv_bridge::Exception& e)
        ROS_ERROR("cv_bridge exception: %s", e.what());

Thanks in advance everybody can help me!! ;)

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4 Answers

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answered 2011-11-07 20:18:31 -0500

Deby85 gravatar image

Thank you Felix, I solved my problem simply using the the following command:

frame = img_bridge_.imgMsgToCv(img, "bgr8");

and now it works properly. :D

Hoping don't boring you, I have another question for you or everybody could help me: I installed ROS and openni_kinect on another computer exactly how I made previously on mine, but when I try to used the IR camera with command:

rosrun image_view image_view image:/camera/ir/image_raw

It returns me the following error:

Illegal Instruction

I've looked for a solution on the web, but I haven't found it. Could someone help me ??

Thanks in advance

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For a new question open a new thread. This one sounds like you are using binaries that don't fit your system.
dornhege gravatar image dornhege  ( 2011-11-07 23:37:05 -0500 )edit
This illegal instruction was a bug a in opencv, and I heard that it's been fixed in the latest release. You may want to update your opencv package.
Kadir Firat Uyanik gravatar image Kadir Firat Uyanik  ( 2012-01-17 03:13:59 -0500 )edit

answered 2011-11-08 01:38:01 -0500

Deby85 gravatar image

Sorry dornhege, I've posted my 2nd question here, because is always a problem about getting IR stream from kinect!

In any case, I'm using ROS electric on Ubuntu 11.04. Checking flags on the system I found that it supports sse, sse2, ssse3, while mine supports also sse4_1. It could be this the problem?

I found some suggestions for this kind of problems in ROS Diamondback for the CMakeList file of openni_camera, but they don't work in CMakeList file of openni_launch.

Have you got any suggestion?

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answered 2013-02-02 12:54:38 -0500

davevh gravatar image

If you used "rosrun image_view image_view image:/camera/ir/image_raw" then the problem may be that you need ":=" instead of just ":".

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answered 2011-10-17 21:29:02 -0500

My guess is that your visualization doesn't handle mono16, but assumes mono8. Try an explicit conversion (with scaling) before displaying.

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Asked: 2011-10-17 20:54:14 -0500

Seen: 2,679 times

Last updated: Feb 02 '13