我输入此命令从intel realsense R200相机中提取深度图像：
rosrun image_view extract_images _sec_per_frame:=0.01 image:=/camera/depth/image_raw
我无法获取图片，而是显示此错误：
[ERROR] [1529053683.952956798]: Unable to convert 16UC1 image to bgr8
[ WARN] [1529053683.953020485]: Couldn't save image, no data!
当我为彩色图像输入此命令时，它有效：
rosrun image_view extract_images _sec_per_frame:=0.01 image:=/camera/color/image_raw
如何解决此问题？