boofcv.alg.filter.derivative

Class GradientThree

java.lang.Object

boofcv.alg.filter.derivative.GradientThree

public class GradientThree
extends java.lang.Object

Computes the image's first derivative along the x and y axises using [-1 0 1] kernel.

Th 1-D kernel allows the image's gradient to be computed efficiently but is more sensitive to local noise.

For example in an integer image:
derivX(x,y) = img(x+1,y) - img(x-1,y)
derivY(x,y) = img(x,y+1) - img(x,y-1)

Field Summary

Fields

Modifier and Type	Field and Description
static Kernel1D_F32	kernelDeriv_F32
static Kernel1D_I32	kernelDeriv_I32

Constructor Summary

Constructors

Constructor and Description
GradientThree()

Method Summary

Modifier and Type	Method and Description
static Kernel1D	getKernelX(boolean isInteger) Returns the kernel for computing the derivative along the x-axis.
static void	process(ImageFloat32 orig, ImageFloat32 derivX, ImageFloat32 derivY, ImageBorder_F32 border) Computes the derivative of an ImageFloat32 along the x and y axes.
static void	process(ImageSInt16 orig, ImageSInt16 derivX, ImageSInt16 derivY, ImageBorder_S32 border) Computes the derivative of an ImageSInt16 along the x and y axes.
static void	process(ImageUInt8 orig, ImageSInt16 derivX, ImageSInt16 derivY, ImageBorder_S32 border) Computes the 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

kernelDeriv_I32

public static Kernel1D_I32 kernelDeriv_I32

kernelDeriv_F32

public static Kernel1D_F32 kernelDeriv_F32

Constructor Detail

GradientThree

public GradientThree()

Method Detail

getKernelX

public static Kernel1D getKernelX(boolean isInteger)

Returns the kernel for computing the derivative along the x-axis.

process

public static void process(ImageUInt8 orig,
                           ImageSInt16 derivX,
                           ImageSInt16 derivY,
                           ImageBorder_S32 border)

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

Parameters:

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

derivX - Derivative along the x-axis. Modified.

derivY - Derivative along the y-axis. Modified.

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

process

public static void process(ImageSInt16 orig,
                           ImageSInt16 derivX,
                           ImageSInt16 derivY,
                           ImageBorder_S32 border)

Computes the derivative of an ImageSInt16 along the x and y axes.

Parameters:

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

derivX - Derivative along the x-axis. Modified.

derivY - Derivative along the y-axis. Modified.

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

process

public static void process(ImageFloat32 orig,
                           ImageFloat32 derivX,
                           ImageFloat32 derivY,
                           ImageBorder_F32 border)

Computes the derivative of an ImageFloat32 along the x and y axes.

Parameters:

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

derivX - Derivative along the x-axis. Modified.

derivY - Derivative along the y-axis. Modified.

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