white balance problem for USB camera

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Hi All,

I have an Orbbec Astra Pro camera and I can get the RGB image using libuvc_camera package. However, the RGB image I get doesn't look very good. You can see the image below.

It looks like there's one yellow layer on top of the image. I was told this is due to a bad white balance. I tried to enable the auto_white_balance setting in libuvc but it makes no difference. This is the launch file I ran:

<launch>
  <group ns="camera">
    <node pkg="libuvc_camera" type="camera_node" name="mycam">
      <!-- Parameters used to find the camera -->
      <param name="vendor" value="0x0"/>
      <param name="product" value="0x0"/>
      <param name="serial" value=""/>
      <!-- If the above parameters aren't unique, choose the first match: -->
      <param name="index" value="0"/>

      <!-- Image size and type -->
      <param name="width" value="640"/>
      <param name="height" value="480"/>
      <!-- choose whichever uncompressed format the camera supports: -->
      <param name="video_mode" value="uncompressed"/> <!-- or yuyv/nv12/mjpeg -->
      <param name="frame_rate" value="15"/>

      <param name="timestamp_method" value="start"/> <!-- start of frame -->
      <param name="camera_info_url" value="file:///tmp/cam.yaml"/>

      <param name="auto_exposure" value="3"/> <!-- use aperture_priority auto exposure -->
      <param name="auto_white_balance" value="true"/>
    </node>
  </group>
</launch>

Does anyone known how to solve this while balance problem with my astra pro camera? I'm running this on Ros-Kinetic with Ubuntu 16.04. Thanks!