Documentation

sphereModel class

Object for storing a parametric sphere model

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Syntax

model = sphereModel(params)

Description

Object for storing a parametric sphere model

Construction

model= sphereModel(params)constructs a parametric sphere model from the 1-by-4paramsinput vector that describes a sphere.

Input Arguments

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Sphere parameters, specified as a 1-by-4 scalar vector. This input specifies theParametersproperty. The four parameters [a,b,c,d] satisfy the equation for a sphere:

( x − a ) 2 + ( y − b ) 2 + ( z − c ) 2 = d 2

Properties

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These properties are read-only.

Sphere model parameters, stored as a 1-by-4 vector. These parameters are specified by theparamsinput argument. The four parameters [a,b,c,d] satisfy the equation for a sphere:

( x − a ) 2 + ( y − b ) 2 + ( z − c ) 2 = d 2

Center of the sphere, stored as a 1-by-3 vector [xc,yc,zc] that specifies the center coordinates of the sphere.

Radius of sphere, stored as a scalar value.

Methods

plot Plot sphere in a figure window

Examples

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Open Live Script

Load point cloud.

load('object3d.mat');

Display point cloud.

figure pcshow(ptCloud) xlabel('X(m)') ylabel('Y(m)') zlabel('Z(m)') title('Detect a sphere in a point cloud')

Set the maximum point-to-sphere distance (1cm), for sphere fitting.

maxDistance = 0.01;

Set the region of interest to constrain the search.

roi = [-inf, 0.5; 0.2, 0.4; 0.1, inf]; sampleIndices = findPointsInROI(ptCloud, roi);

Detect the globe in the point cloud and extract it.

model = pcfitsphere(ptCloud, maxDistance,'SampleIndices', sampleIndices);

Plot the sphere.

holdonplot(model)

See Also

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Topics

Introduced in R2015b

Computer Vision Toolbox Documentation
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