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uvc_cam study  

2012-09-27 09:05:10|  分类: ros study |  标签: |举报 |字号 订阅

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err1:
     Problem setting exposure.Exception was unable to set control

solve:setting absolute exposure works fine.(modify uvc_cam.launch in ros2opencv: exposure--->absolute_exposure)

err2:
     Unable to open camera calibration file[...camera_info/camera.yaml] not found
     calibration does not match video mode (publishing uncalibrated data)
This err is unsolve. I can't find "camera_info/camera.yaml" after installing ros ( fuerte ubuntu 11.10).

when runing roslaunch ros2opencv uvc_cam.launch, check rostopic list | grep image_raw to see the available raw image topics from compatible drivers.The result: (at this time, camera is opening)

/camera/image_raw

/camera/image_raw/compressed

/camera/image_raw/compressed/parameter_descriptions

/camera/image_raw/compressed/parameter_updates

/camera/image_raw/compressedDepth

/camera/image_raw/compressedDepth/parameter_descriptions

/camera/image_raw/compressedDepth/parameter_updates

/camera/image_raw/theora

/camera/image_raw/theora/parameter_descriptions

/camera/image_raw/theora/parameter_updates

runing "rosrun image_view image_view image:=/camera/image"
          or  "rosrun image_view image_view image:=/camera/image_raw"
without err, but right click display window, the following warn:

[ WARN] [1348709419.550918305]: Couldn't save image, no data!
[ WARN] [1348709420.766485803]: Couldn't save image, no data!


what is UVC-compatible webcam?
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