[ros-users] problems with image_proc using a modified camera

David Feil-Seifer david.feilseifer at gmail.com
Wed Apr 7 23:45:06 UTC 2010

Thank you. That would be nice to have it already in image_proc, and it
is not that huge to do it.


On Wed, Apr 7, 2010 at 4:17 PM, Blaise Gassend <blaise at willowgarage.com> wrote:
> Is the timestamp getting set correctly in the image you are publishing?
> Image_proc will be trying to match timestamps in the images to
> timestamps in the camera_infos.
> This actually seems like a good ticket against image_proc. The
> functionality you are looking for seems like it could be useful to other
> people. I created ticket #3965 to track it.
> On Wed, 2010-04-07 at 15:51 -0700, David Feil-Seifer wrote:
>> I am trying to use image_proc to rectify an image which is just a
>> camera image that has a border added around. The purpose is to make a
>> rectified image that includes all of the image (including what does
>> not strictly fit into a square), not just the centermost part. To do
>> this I made a new node image_letterboxer (included source) to add the
>> border and to adjust the camera calibration cx and cy params to
>> reflect the new center of the image. This has worked when not using
>> image_proc to do the undistort.
>> However, when I try to use this node with image_proc, it does not work
>> at all. I dug a little into the source and found that the image
>> transport is subscribing to the new image topics correctly, and that
>> image transport is registering that subscription, but no callbacks are
>> being called. My image_letterboxer node works well enough so that
>> image_view can display the new image_raw topic with the letterboxed
>> image, but image_proc does not work, though it does work on the camera
>> itself.
>> I assume that the problem is in the image_letterboxer node, but I
>> cannot figure out what I did wrong. Is there some flaw in the way that
>> I'm using image_transport to publish the images? Or is there
>> something
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