Basler camera interface with ROS

These are the steps needed to publish Basler camera images to ROS:

Get the Pylon 5 Camera Software Suite from the Basler website:

http://www.baslerweb.com/en/support/downloads/software-downloads?type=28&series=0&model=0
Follow these instructions (also available in the install file):

a. Change to the directory which contains this INSTALL file, e.g.:

cd ~/pylon-5.0.1.6388-x86_64

b. Extract the corresponding SDK into /opt

sudo tar -C /opt -xzf pylonSDK*.tar.gz

c. Install udev-rules to set up permissions for basler USB cameras

./setup-usb.sh

d. Unplug and replug all USB cameras to get the udev rules applied.

e. Execute /opt/pylon5/bin/PylonViewerApp to test your cameras.

Setup your environment for pylon to find the necessary dependencies:
```
source /opt/pylon5/bin/pylon-setup-env.sh /opt/pylon5
```
If using it more than once, you probably also want to add this to your ~/.bashrc
Build the package using catkin_make
Launch the basler_Camera node with:
```
roslaunch basler_camera basler_camera.launch
```
The frame rate could be modified using the frame_rate parameter.

The camera can optionally be selected with the serial_number parameter.

The image can be visualized using image_view:

rosrun image_view image_view image:=/camera/image_raw

If you have a stereo system then launch the cameras as:

roslaunch basler_camera stereo_rectified.launch

or:

roslaunch basler_camera stereo_unrectified.launch

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