How to trim a ponit cloud

I have generated pointcloud -- ptCloud using pcfromkinect function ( as in the Matlab example) . Now I want to trim the pointcloud using

x = ptCloud.Location(100:200 ,100:200,1);
y = ptCloud.Location(100:200 ,100:200,2);
z = ptCloud.Location(100:200 ,100:200,3);

R = ptCloud.Location(100:200 ,100:200,1);
G = ptCloud.Location(100:200 ,100:200,2);
B = ptCloud.Location(100:200 ,100:200,3);

PTC.Location(:,:,1)  =x;
PTC.Location(:,:,2)  =y;
PTC.Location(:,:,3)  =z;
PTC.Color(:,:,1) = R;
PTC.Color(:,:,2) = G;
PTC.Color(:,:,3) = B;

then pcshow(PTC)

but not working any sugesion or matlab file exchange files wiill be highy appreciated

[Walter Roberson]

You appear to be extracting the same information for R as you are for x, and similarly y and G, and z and B. If that is deliberate then why not just copy what you already extracted?

[Image Analyst]

I don't even know what you want to do. What does it mean to "trim a point cloud"? Do you mean crop? Remove outliers? "Trim" does not seem to be a precisely defined term in your context. Like for strings, trim means to remove leading and trailing white space. But I have no idea what you mean. Well, 2 ideas that I just gave but I still am not sure if it's one of those or something else.

[Hall marokey]

In fact I have a point cloud obtained from kinect v2. Now I want to identify objects using color information . Once identified I would like to reduce the whole point cloud to identified object only. So I search the color information in the point cloud ptCloud.Color with RGB values. I dont know how use a find command for a 3d array for color or like [i,j] = find(ptCloud.color ==[ R G B]) Thanks for help

Answer 1

[Hongxu Guo]

Just in case someone is still looking for solving similar issue

Pls look here.

https://www.mathworks.com/help/vision/ref/pointcloud.findpointsinroi.html