I wanted to view stereo images using the stereo_image_proc but I always get
three blank windows(disparity, left, right). I am using the uvc_stereo
driver for two separate webcams. I am assuming that this driver fakes the
synchronization. The driver also publishes the topics at this format:
/left/image_raw, /right/image_raw so I typed in ROS_NAMESPACE=/, am I right
on this? The stereo_image_proc window is also displaying an error: "[ERROR]
[1295580006.697030969]: [stereo_image_proc] Rectified or stereo topic
requested, but cameras are uncalibrated." Should I get the cameras
calibrated first? Is there any way I can run it without calibrating, just
for simple testing? Here's the node info if it can help:

Node [/stereo_image_proc_1295578845843245812]
Publications:
 * /left/image_mono [sensor_msgs/Image]
 * /left/image_color [sensor_msgs/Image]
 * /points2 [sensor_msgs/PointCloud2]
 * /left/image_rect_color [sensor_msgs/Image]
 * /rosout [roslib/Log]
 * /points [sensor_msgs/PointCloud]
 * /right/image_rect [sensor_msgs/Image]
 * /right/image_mono [sensor_msgs/Image]
 * /disparity [stereo_msgs/DisparityImage]
 * /right/image_color [sensor_msgs/Image]
 * /stereo_image_proc_1295578845843245812/parameter_updates
[dynamic_reconfigure/Config]
 * /left/image_rect [sensor_msgs/Image]
 * /right/image_rect_color [sensor_msgs/Image]
 * /stereo_image_proc_1295578845843245812/parameter_descriptions
[dynamic_reconfigure/ConfigDescription]

Subscriptions:
 * /right/image_raw [sensor_msgs/Image]
 * /left/camera_info [sensor_msgs/CameraInfo]
 * /right/camera_info [sensor_msgs/CameraInfo]
 * /left/image_raw [sensor_msgs/Image]

Services:
 * /stereo_image_proc_1295578845843245812/set_logger_level
 * /stereo_image_proc_1295578845843245812/set_parameters
 * /stereo_image_proc_1295578845843245812/get_loggers


contacting node http://roboteknik-desktop:48241/ ...
Pid: 3980
Connections:
 * topic: /rosout
    * to: /rosout
    * direction: outbound
    * transport: TCPROS
 * topic: /stereo_image_proc_1295578845843245812/parameter_descriptions
    * to: /reconfigure_gui_4042_1295578871464
    * direction: outbound
    * transport: TCPROS
 * topic: /stereo_image_proc_1295578845843245812/parameter_updates
    * to: /reconfigure_gui_4042_1295578871464
    * direction: outbound
    * transport: TCPROS
 * topic: /left/image_rect
    * to: /stereo_view_1295579688171590464
    * direction: outbound
    * transport: TCPROS
 * topic: /right/image_rect
    * to: /stereo_view_1295579688171590464
    * direction: outbound
    * transport: TCPROS
 * topic: /disparity
    * to: /stereo_view_1295579688171590464
    * direction: outbound
    * transport: TCPROS
 * topic: /left/image_raw
    * to: http://roboteknik-desktop:55552/
    * direction: inbound
    * transport: TCPROS
 * topic: /left/camera_info
    * to: http://roboteknik-desktop:55552/
    * direction: inbound
    * transport: TCPROS
 * topic: /right/image_raw
    * to: http://roboteknik-desktop:55552/
    * direction: inbound
    * transport: TCPROS
 * topic: /right/camera_info
    * to: http://roboteknik-desktop:55552/
    * direction: inbound
    * transport: TCPROS