Histograms from point cloud
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Théodore Keller
le 9 Juil 2019
Commenté : Théodore Keller
le 15 Juil 2019
Hello,
Basically, I have 3D coordinates points (xyzPoints) and I want to display 3 histograms of x, y and z coordinates values in order to visualize the density of data cloud.
xyzPoints = reconstructScene(disparityMap, stereoParamsTEST);
xyzPoints = xyzPoints./1000;
ptCloud = pointCloud(xyzPoints);
figure(4);
pcshow(ptCloud);
title('Point cloud');
How do I create variables for x, y and z coordinates values to do this :
subplot(2,2,1);
hist(x);
subplot(2,2,2);
hist(y);
subplot(2,2,3);
hist(z);
Thanks
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Rik
le 9 Juil 2019
It looks like you can use the columns from xyzPoints, because they seem to store the coordinates. Otherwise you could also use the location property of your point cloud object.
3 commentaires
Rik
le 9 Juil 2019
You need to save the data to that variable first. The property I was referring to can be found in the documentation for the pointCloud function.
But as Steven points out: you can simply do something like this.
xyzPoints = reconstructScene(disparityMap, stereoParamsTEST);
xyzPoints = xyzPoints./1000;
figure(1),clf(1)%create a clean window (bring to focus and clear if it already exists)
for dim=1:3
subplot(2,2,dim);
temp=xyzPoints(:,:,dim);
hist(temp(:));
title(char('x'-1+dim))%use a trick to map {1 2 3} to {'x' 'y' 'z'}
end
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Steven Lord
le 9 Juil 2019
You said in your comment to Rik's answer that xyzPoints is size [2019 4063 3]. I assume therefore that the x data is the first page of that data xyzPoints(:, :, 1), the y data is the second page xyzPoints(:, :, 2), and the z data is the third page xyzPoints(:, :, 3)? If so, call histogram on each of those pages of data.
Alternately you could plot them using scatter3 or perhaps make a trio of heatmap plots: one for x versus y, one for x versus z, and one for y versus z.
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