PCA Class |
Namespace: OpenCvSharp
The PCA type exposes the following members.
Name | Description | |
---|---|---|
PCA |
default constructor.
The default constructor initializes an empty PCA structure.
The other constructors initialize the structure and call PCA::operator()().
| |
PCA(InputArray, InputArray, PCAFlags, Double) |
Constructor
| |
PCA(InputArray, InputArray, PCAFlags, Int32) |
Constructor
|
Name | Description | |
---|---|---|
AllocatedMemory |
Gets or sets a memory address allocated by AllocMemory.
(Inherited from DisposableObject.) | |
AllocatedMemorySize |
Gets or sets the byte length of the allocated memory
(Inherited from DisposableObject.) | |
CvPtr |
Native pointer of OpenCV structure
(Inherited from DisposableCvObject.) | |
DataHandle |
Gets or sets a handle which allocates using cvSetData.
(Inherited from DisposableObject.) | |
Eigenvalues |
eigenvalues of the covariation matrix
| |
Eigenvectors |
eigenvalues of the covariation matrix
| |
IsDisposed |
Gets a value indicating whether this instance has been disposed.
(Inherited from DisposableObject.) | |
IsEnabledDispose |
Gets or sets a value indicating whether you permit disposing this instance.
(Inherited from DisposableObject.) | |
Mean |
mean value subtracted before the projection and added after the back projection
|
Name | Description | |
---|---|---|
AllocGCHandle |
Pins the object to be allocated by cvSetData.
(Inherited from DisposableObject.) | |
AllocMemory |
Allocates the specified size of memory.
(Inherited from DisposableObject.) | |
BackProject(InputArray) |
Reconstructs vectors from their PC projections.
The methods are inverse operations to PCA::project. They take PC
coordinates of projected vectors and reconstruct the original vectors.
Unless all the principal components have been retained, the
reconstructed vectors are different from the originals. But typically,
the difference is small if the number of components is large enough (but
still much smaller than the original vector dimensionality). As a result, PCA is used.
| |
BackProject(InputArray, OutputArray) |
Reconstructs vectors from their PC projections.
The methods are inverse operations to PCA::project. They take PC
coordinates of projected vectors and reconstruct the original vectors.
Unless all the principal components have been retained, the
reconstructed vectors are different from the originals. But typically,
the difference is small if the number of components is large enough (but
still much smaller than the original vector dimensionality). As a result, PCA is used.
| |
Compute |
Performs PCA.
The operator performs %PCA of the supplied dataset. It is safe to reuse
the same PCA structure for multiple datasets. That is, if the structure
has been previously used with another dataset, the existing internal
data is reclaimed and the new @ref eigenvalues, @ref eigenvectors and @ref
mean are allocated and computed.
The computed @ref eigenvalues are sorted from the largest to the smallest and
the corresponding @ref eigenvectors are stored as eigenvectors rows.
| |
ComputeVar |
Performs PCA.
The operator performs %PCA of the supplied dataset. It is safe to reuse
the same PCA structure for multiple datasets. That is, if the structure
has been previously used with another dataset, the existing internal
data is reclaimed and the new @ref eigenvalues, @ref eigenvectors and @ref
mean are allocated and computed.
The computed @ref eigenvalues are sorted from the largest to the smallest and
the corresponding @ref eigenvectors are stored as eigenvectors rows.
| |
Dispose |
Releases the resources
(Inherited from DisposableObject.) | |
Dispose(Boolean) |
Releases the resources
(Inherited from DisposableObject.) | |
DisposeManaged |
Releases managed resources
(Inherited from DisposableObject.) | |
DisposeUnmanaged |
Releases unmanaged resources
(Overrides DisposableCvObjectDisposeUnmanaged.) | |
Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) | |
Finalize |
Destructor
(Inherited from DisposableObject.) | |
GetHashCode | Serves as the default hash function. (Inherited from Object.) | |
GetType | Gets the Type of the current instance. (Inherited from Object.) | |
MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) | |
NotifyMemoryPressure |
Notifies the allocated size of memory.
(Inherited from DisposableObject.) | |
Project(InputArray) |
Projects vector(s) to the principal component subspace.
The methods project one or more vectors to the principal component
subspace, where each vector projection is represented by coefficients in
the principal component basis. The first form of the method returns the
matrix that the second form writes to the result. So the first form can
be used as a part of expression while the second form can be more
efficient in a processing loop.
| |
Project(InputArray, OutputArray) |
Projects vector(s) to the principal component subspace.
| |
Read |
Load PCA objects.
Loads @ref eigenvalues @ref eigenvectors and @ref mean from specified FileNode
| |
ThrowIfDisposed |
If this object is disposed, then ObjectDisposedException is thrown.
(Inherited from DisposableObject.) | |
ToString | Returns a string that represents the current object. (Inherited from Object.) | |
Write |
Write PCA objects.
Writes @ref eigenvalues @ref eigenvectors and @ref mean to specified FileStorage
|
Name | Description | |
---|---|---|
ptr |
Data pointer
(Inherited from DisposableCvObject.) |