point cloud find center

2016 5 8
2 个回答
更新时间：2016 5 8
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I have a very large point cloud (42 million points), and I need to find the center of this cloud.

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回答（2 个）

Star Strider
Star Strider 2016-5-8

1 个投票

The centre (or more accurately in this example, ‘centroid’) is the mean of the individual x, y, and z coordinates for the cloud. So if each row of the matrix defining them is an individual point, and the columns define the position of each point, the coordinates of the centroid are the mean of the matrix.
Image Analyst
Image Analyst 2016-5-8

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Why can't you just average all of the components?

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Evan
Evan 2016-5-8
First off, Thank you Image Analyst. I have tried simply taking the avg of the x y z values, but the results are not quite right, so I figured I would inquire in hope that there is a pre-built Matlab tool that I was missing.
Image Analyst
Image Analyst 2016-5-8
Why do you say it's not right? I know there may be some reasons (and I can think of some) but I want to hear your reason.
Walter Roberson
Walter Roberson 2016-5-8
What is the range of values? With 42 million of them, I would be concerned about exceeding (required precision)/eps when they are totaled
Image Analyst
Image Analyst 2016-5-8
Good point. Might be able to get pretty much the same centroid just by taking a subset of them.

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