Image data is all zero

[ghost]

I successfully compiled all the packages,start the jetbot_camera node.But I get the image is all zero.

At the same time I can successfully run a separate jetson-interface.

thanks!

[localryu]

Hi. @YuyingJin0111

I have a same error when I run the jetbot_camera node.

Did you solve the issue?
How can i solve this error...?

[alex-makarov]

Another possible workaround is to pass the converted RGBA via CPU memory. In jetbot_camera.cpp:

       // convert from YUV to RGBA
-       if( !camera->ConvertRGBA(imgCUDA, &imgRGBA) )
+       if( !camera->ConvertRGBA(imgCUDA, &imgRGBA, true) )
        {
                ROS_ERROR("failed to convert from NV12 to RGBA");
                return false;
        }

        // assure correct image size
        if( !camera_cvt->Resize(camera->GetWidth(), camera->GetHeight()) )
        {
                ROS_ERROR("failed to resize camera image converter");
                return false;
        }
+       memcpy(camera_cvt->ImageGPU(), imgRGBA, camera_cvt->GetSize()); 
 
        // populate the message
        sensor_msgs::Image msg;

[shannon112]

hi, @alex-makarov I have tried your solution, it works. Thanks a lot. But image would flash when environment is changing. Do you know why?

[alex-makarov]

Not yet, I will look into it.

[alex-makarov]

@shannon112 - actually I'd recommend to use the patch from @nicolas-beaufort, works better for me.