SoHessianMatrixProcessing2d Class Reference
[Other Derivatives]

SoHessianMatrixProcessing2d engine computes the local Hessian matrix More...

#include <ImageViz/Engines/EdgeDetection/OtherDerivatives/SoHessianMatrixProcessing2d.h>

Inheritance diagram for SoHessianMatrixProcessing2d:

List of all members.

Public Member Functions
	SoHessianMatrixProcessing2d ()
Public Attributes
SoSFImageDataAdapter	inImage
SoSFVec2f	standardDeviation
SoImageVizEngineOutput < SoSFImageDataAdapter, SoImageDataAdapter * >	outSymmetricMatrixImage

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Detailed Description

SoHessianMatrixProcessing2d engine computes the local Hessian matrix

The SoHessianMatrixProcessing2d engine computes the local Hessian matrix by convolving the input image with the 2nd order derivatives of a Gaussian Kernel.

Each channel of the Hessian matrix represents a second order partial derivative.

For instance, , .

This filter provides an output spectral image where each channel represents a 2nd order derivative set in the following order , , .

In order to extract the eigenvalues or vectors of the Hessian image the SoEigenDecompositionProcessing2d can be applied on the spectral image output.

SEE ALSO

SoGaussianDerivativeProcessing, SoEigenDecompositionProcessing2d, SoHessianMatrixProcessing3d

FILE FORMAT/DEFAULT

HessianMatrixProcessing2d {

inImage	NULL
standardDeviation	1.0f 1.0f

}

Library references: hessianmatrix

See related examples:

Hessian

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Constructor & Destructor Documentation

SoHessianMatrixProcessing2d::SoHessianMatrixProcessing2d

(

)

Constructor.

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Member Data Documentation

SoSFImageDataAdapter SoHessianMatrixProcessing2d::inImage

Input image.

Default value is NULL. Supported types include: grayscale image.

SoImageVizEngineOutput<SoSFImageDataAdapter,SoImageDataAdapter*> SoHessianMatrixProcessing2d::outSymmetricMatrixImage

Output image.

Default value is NULL. Supported types include: grayscale image.

SoSFVec2f SoHessianMatrixProcessing2d::standardDeviation

Sigma for each direction (X, Y).

Each value must be greater than or equal to 0.1. Default value is SbVec2f(1.0f,1.0f).

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The documentation for this class was generated from the following file:

• ImageViz/Engines/EdgeDetection/OtherDerivatives/SoHessianMatrixProcessing2d.h