Package boofcv.alg.filter.derivative

Class HessianThreeDeterminant

java.lang.Object

boofcv.alg.filter.derivative.HessianThreeDeterminant

public class HessianThreeDeterminant
extends Object

Computes the determinant of a Hessian computed by differentiating using [-1 0 1] kernel.
f(x,y) = Lxx*Lyy - Lxy²
The Lxx and Lyy have a kernel of [1 0 -2 0 1] and Lxy is:

       [  1   0  -1 ]
 Lxy = [  0   0   0 ]
       [ -1   0   1 ]
 

Constructor Summary

Constructors

Constructor	Description
HessianThreeDeterminant()

Method Summary

Modifier and Type	Method	Description
static void	process(GrayF32 orig, GrayF32 deriv, @Nullable ImageBorder_F32 border)	Computes the Laplacian of 'orig'.
static void	process(GrayU8 orig, GrayF32 deriv, @Nullable ImageBorder_S32<GrayU8> border)	Computes Laplacian on an U8 image but outputs derivative in a F32 image.
static void	process(GrayU8 orig, GrayS16 deriv, @Nullable ImageBorder_S32<GrayU8> border)	Computes the Laplacian of input image.

Methods inherited from class java.lang.Object

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

Constructor Details

HessianThreeDeterminant

public HessianThreeDeterminant()

Method Details

process

public static void process(GrayU8 orig,
 GrayS16 deriv,
 @Nullable
 @Nullable ImageBorder_S32<GrayU8> border)

Computes the Laplacian of input image.

Parameters:

orig - Input image. Not modified.

deriv - Where the Laplacian is written to. Modified.

process

public static void process(GrayU8 orig,
 GrayF32 deriv,
 @Nullable
 @Nullable ImageBorder_S32<GrayU8> border)

Computes Laplacian on an U8 image but outputs derivative in a F32 image. Removes a step when processing images for feature detection

process

public static void process(GrayF32 orig,
 GrayF32 deriv,
 @Nullable
 @Nullable ImageBorder_F32 border)

Computes the Laplacian of 'orig'.

Parameters:

orig - Input image. Not modified.

deriv - Where the Laplacian is written to. Modified.