I add the kinect camera in the gazebo ,now i want to know the kinect internal parameters fx fy u v from the kinectgazebo.xacro or setting the internal parameters in the file,how can i do this？ kinectgazebo.xacro below

<xacro:macro name="kinect_camera" params="prefix:=camera">
    <!-- Create kinect reference frame -->
    <!-- Add mesh for kinect -->
    <link name="${prefix}_link">
        <origin xyz="0 0 0" rpy="0 0 0"/>
        <visual>
            <origin xyz="0 0 0" rpy="0 0 ${M_PI/2}"/>
            <geometry>
                <mesh filename="package://kinova_description/meshes/kinect.dae" />
            </geometry>
        </visual>
        <collision>
            <geometry>
                <box size="0.07 0.3 0.09"/>
            </geometry>
        </collision>
    </link>

    <joint name="${prefix}_optical_joint" type="fixed">
        <origin xyz="0 0 0" rpy="-1.5708 0 -1.5708"/>
        <parent link="${prefix}_link"/>
        <child link="${prefix}_frame_optical"/>
    </joint>

    <link name="${prefix}_frame_optical"/>

    <gazebo reference="${prefix}_link">
        <sensor type="depth" name="${prefix}">
            <always_on>true</always_on>
            <update_rate>20.0</update_rate>
            <camera>
                <horizontal_fov>${60.0*M_PI/180.0}</horizontal_fov>
                <image>
                    <format>R8G8B8</format>
                    <width>640</width>
                    <height>480</height>
                </image>
                <clip>
                    <near>0.05</near>
                    <far>8.0</far>
                </clip>
            </camera>
            <plugin name="kinect_${prefix}_controller" filename="libgazebo_ros_openni_kinect.so">
                <cameraName>${prefix}</cameraName>
                <alwaysOn>true</alwaysOn>
                <updateRate>10</updateRate>
                <imageTopicName>rgb/image_raw</imageTopicName>
                <depthImageTopicName>depth/image_raw</depthImageTopicName>
                <pointCloudTopicName>depth/points</pointCloudTopicName>
                <cameraInfoTopicName>rgb/camera_info</cameraInfoTopicName>
                <depthImageCameraInfoTopicName>depth/camera_info</depthImageCameraInfoTopicName>
                <frameName>${prefix}_frame_optical</frameName>
                <baseline>0.1</baseline>
                <distortion_k1>0.0</distortion_k1>
                <distortion_k2>0.0</distortion_k2>
                <distortion_k3>0.0</distortion_k3>
                <distortion_t1>0.0</distortion_t1>
                <distortion_t2>0.0</distortion_t2>
                <pointCloudCutoff>0.4</pointCloudCutoff>
            </plugin>
        </sensor>
    </gazebo>

</xacro:macro>