MATLAB: 3D Point Cloud watershed

clouderrorImage Processing Toolboxmatrixpointwatershedxyz

I have a Point Cloud or the equivalent of a 2D nx3 matrix of my x,y,z coordinates which generate a volume. I am trying to call "watershed" on it, but I am getting unexpected results. Why is this happening?

Best Answer

The "watershed" function takes in an input image, specified as a real, nonsparse, numeric, or logical array of any dimension.

"watershed" is not throwing an error because your input is of the correct type. However, "watershed" is interpreting your data as a 2D image that is nx3 and not a 3D Volume that would be generated by a Point Cloud.

In order to get the correct "watershed" output, input the 3-D binary image of the volume and not the Point Cloud (x,y,z) data.

For more information please see the following documentation page:

https://www.mathworks.com/help/images/ref/watershed.html

Related Solutions

MATLAB: How to visualize the contributive factors and distribution of coefficients in the “coeff” matrix output by “pca”

One possible approach is to provide the "coeff" matrix as the input to the "heatmap" function. The x-axis would represent the principal components, while the y-axis would represent the predictor variables. The heatmap would indicate the distribution of the contributive features for each principal component.

In order to illustrate, here is an example:

load hald
coeff = pca(ingredients)
heatmap(coeff,'XLabel','Principal Components','YLabel','Variables');

For more details about the "heatmap" function, you can refer to the following link:

<https://www.mathworks.com/help/releases/R2018b/matlab/ref/heatmap.html#bvlbg64-1>

Note that the "biplot" function provides another way to visualize the magnitude and sign of each variable's contribution to the first two or three principal components:

<https://www.mathworks.com/help/releases/R2018b/stats/biplot.html>

<https://www.mathworks.com/help/releases/R2018b/stats/pca.html#btjpztu-1>

MATLAB: Watershed

Hi, Just simple mistake.

You save your script with name watershed

however, watershed is built-in function in Matlab.

Try to rename your script and it will works.

Best Answer

Related Solutions

MATLAB: How to visualize the contributive factors and distribution of coefficients in the “coeff” matrix output by “pca”

MATLAB: Watershed

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