topic Re: How do I get the x y z coordinates from the depth stream? in Items with no label

How do I get the x y z coordinates from the depth stream?

JKjel1 — Mon, 11 Mar 2019 15:42:20 GMT

Hi,

I am using the RealSense D435 camera. I want to obtain the x y z coordinates from the /camera/depth/image_rect_raw topic for each frame. How do I do this?

The message format of the topic gives me a parameter Data[] which gives me depth values from 0 to 255 for each pixel but I want the x y z coordinates.

The RealSense SDK can create a pointcloud, is it possible to get the coordinates from each point in the pointcloud?

Re: How do I get the x y z coordinates from the depth stream?

Eliza_D_Intel — Mon, 11 Mar 2019 22:11:50 GMT

Hello JKjel1, Thank you for your interest in the Intel RealSense D435 camera. You can check out this post on GitHub where is explained how to get x,y,z values from the pointcloud : https://github.com/IntelRealSense/librealsense/issues/1712 Thank you and best regards, Eliza

Re: How do I get the x y z coordinates from the depth stream?

Eliza_D_Intel — Mon, 18 Mar 2019 16:15:58 GMT

Hello JKjel1, Could you please let us know if you require further assistance on this topic? Thank you, Eliza

Re: How do I get the x y z coordinates from the depth stream?

JKjel1 — Mon, 18 Mar 2019 16:47:47 GMT

I tried the link where it says that I should launch rs_rgbd.launch and then I should get the information from pointcloud2. But when I try this I can't find a topic named "pointcloud2".

I then tried the second answer, which I think works. I use the x and y position from the Data[] array and the corresponding z value (between 0-255). This way I can get x,y,z but I was not sure this was the correct way to tackle this problem, but from the second answer I guess it is. So I don't think I need furter assistance. Thank you!