[ros-users] Nodelet version of image_view

[Nicholas Butko]

Patrick, 

Is there a reason that image_view tries to avoid calling cvWaitKey? If not, can we add it? Does it hurt anything?

I just installed OpenCV 2.2 on OSX with the QT backend. It works beautifully, and seems much nicer than the simple Cocoa wrapper. 

Unfortunately, with this configuration, image_view no longer works unless cvWaitKey is called, despite the call to cvStartWindowThread(). 

--Nick 


On Dec 7, 2010, at 1:13 AM, Patrick Mihelich wrote:

> Hi Nick,
> 
> In your nodelet, do you call cvStartWindowThread()? This is what allows image_view to update without explicitly calling cvWaitKey.
> 
> Cheers,
> Patrick
> 
> On Sun, Dec 5, 2010 at 5:22 PM, Nicholas Butko <nbutko at ucsd.edu> wrote:
> I was trying what is essentially this (nodelet image_view) today. I am having a problem, and I don't know if it's unique problem to OSX, or not. If it's unique to OSX, I'll try to fix it in OpenCV, but if not, it's probably better to fix it in nodelet.
> 
> The problem is that cvWaitKey never gets called from the main thread, and so the window content never updates. I have a perpetually white window. Calling cvWaitKey from the nodelet thread is not sufficient.
> 
> If you guys want to try this from Ubuntu, I'm happy to send source.
> 
> --Nick
> 
> 
> On Dec 5, 2010, at 2:24 PM, Radu Bogdan Rusu wrote:
> 
> > Bill, if you want to do that, I can do the point cloud part (pcd_viewer). Save some cycles, split some work. :)
> >
> >
> > On 12/05/2010 02:23 PM, Bill Morris wrote:
> >> On Sun, 2010-12-05 at 14:15 -0800, Radu Bogdan Rusu wrote:
> >> ...
> >>> Speaking of GUIs, it would be really nice to get image_view/rviz/pcd_viewer to have a nodelet component for displaying
> >>> data fast(er). Do you see any drawbacks of nodelets w. GUIs? If not, I might try to do the image_view/pcd_viewer part
> >>> next week as an exercise.
> >>
> >> I would really like to see a nodelet version of image_view if only to
> >> ensure proper operation of a nodelet camera driver.
> >
> >
> > Cheers,
> > Radu.
> > --
> > http://pointclouds.org
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> 
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