boofcv.alg.filter.derivative

Class HessianThree

java.lang.Object

boofcv.alg.filter.derivative.HessianThree

public class HessianThree
extends Object

Computes the second derivative (Hessian) of an image using. This hessian is derived by using the same gradient function used in GradientThree, which uses a kernel of [-1 0 1].

WARNING: It is computationally more expensive to compute the Hessian with this operation than applying the gradient operator multiple times. However, this does not require the creation additional storage to save intermediate results.

Kernel for ∂ ²f/∂ x² and ∂²f /∂ y² is [1 0 -2 0 1] and ∂²f/∂ x∂y is:

Author:

Peter Abeles

Field Summary

1	0	-1
0	0	0
-1	0	1

Fields

Modifier and Type	Field and Description
static Kernel2D_F32	kernelCross_F32
static Kernel2D_I32	kernelCross_I32
static Kernel1D_F32	kernelXXYY_F32
static Kernel1D_I32	kernelXXYY_I32

Constructor Summary

Constructors

Constructor and Description
HessianThree()

Method Summary

Methods

Modifier and Type	Method and Description
static void	process(ImageFloat32 orig, ImageFloat32 derivXX, ImageFloat32 derivYY, ImageFloat32 derivXY, ImageBorder_F32 border) Computes the second derivative of an ImageUInt8 along the x and y axes.
static void	process(ImageUInt8 orig, ImageSInt16 derivXX, ImageSInt16 derivYY, ImageSInt16 derivXY, ImageBorder_I32 border) Computes the second derivative of an ImageUInt8 along the x and y axes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

kernelXXYY_I32

public static Kernel1D_I32 kernelXXYY_I32

kernelCross_I32

public static Kernel2D_I32 kernelCross_I32

kernelXXYY_F32

public static Kernel1D_F32 kernelXXYY_F32

kernelCross_F32

public static Kernel2D_F32 kernelCross_F32

Constructor Detail

HessianThree

public HessianThree()

Method Detail

process

public static void process(ImageUInt8 orig,
           ImageSInt16 derivXX,
           ImageSInt16 derivYY,
           ImageSInt16 derivXY,
           ImageBorder_I32 border)

Computes the second derivative of an ImageUInt8 along the x and y axes.

Parameters:

orig - Which which is to be differentiated. Not Modified.

derivXX - Second derivative along the x-axis. Modified.

derivYY - Second derivative along the y-axis. Modified.

derivXY - Second cross derivative. Modified.

border - Specifies how the image border is handled. If null the border is not processed.

process

public static void process(ImageFloat32 orig,
           ImageFloat32 derivXX,
           ImageFloat32 derivYY,
           ImageFloat32 derivXY,
           ImageBorder_F32 border)

Computes the second derivative of an ImageUInt8 along the x and y axes.

Parameters:

orig - Which which is to be differentiated. Not Modified.

derivXX - Second derivative along the x-axis. Modified.

derivYY - Second derivative along the y-axis. Modified.

derivXY - Second cross derivative. Modified.

border - Specifies how the image border is handled. If null the border is not processed.