what is the distance unit of /camera/depth/image_raw

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Hi Dan, thanks for your answer. I subscribed topic'/camera/depth/image_raw' and print its value at certain pixel but I got a complex number... Does the distance equal to its modulus or I made something wrong?

my code:

   def get_distance(img):
       bridge=CvBridge()
       cv_image = bridge.imgmsg_to_cv2(img, "32FC1")
       print cv_image[10,10]

   rospy.Subscriber('/camera/depth/image_raw',Image,get_distance)

result: [ 2.75039315+2.75118136j] ...

What happens if you don't specify an encoding (defaulting to "passthrough")?

@Dan Lazewatsky "passthrough" works, the result will be an integer. Does it mean python has already decoded the image once? I just tried cpp,and I need to decode with sensor_msgs::image_encodings::TYPE_32FC1.

passthrough uses the encoding specified in the message. If you use another encoding, it will use opencv Mat.convertTo. If that doesn't do what you want, you'll have to do the conversion yourself.

thanks for your reply.

one more question: the data I got (both cpp and python) are not integer. It is a floating number like 0.711012. It should be uint16 as mentioned, but what I got is a float number. I didn't use a real kinect, I was running a simulation from turtlebot_gazebo. Is that the reason why I got a float?