How to find distance between two points in a point cloud?

I have a point cloud obtained from kinect in matlab. I need to find distance between any two points of my interest. If possible how do I select the points and find distance between them, please help me.

Answer 1

[Image Analyst]

Use sqrt().

First convert x and y to cm or m or whatever units your depth image are in (VERY IMPORTANT).

Then just do

z1 = depthImage(y1, x1);
z2 = depthImage(y2, x2);
distance = sqrt((x1-x2)^2 + (y1-y2)^2 + (z1-z2)^2)

[Ajith Kumar Rajendra]

Thanks, I was able to find the distance. I would like to ask you if there's a way to select the points using user interface, for example like selecting points through user click in normal plots using improfile. Is there any way to select points like that in point cloud when viewing through pcplayer?

[Image Analyst]

I don't know of any convenient way to select data points in a 3-D scatter plot. Sorry. There probably is though. Call tech support.