How to trim a ponit cloud

Question

Hall marokey 2017-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/325776-how-to-trim-a-ponit-cloud

回答： Hongxu Guo 2020-10-13

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

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Image Analyst 2017-2-19

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 2017-3-10

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

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