boofcv.alg.transform.pyramid

Class PyramidOps

java.lang.Object

boofcv.alg.transform.pyramid.PyramidOps

public class PyramidOps
extends java.lang.Object

Various operations related to image pyramids.

Constructor Summary

Constructors

Constructor and Description
PyramidOps()

Method Summary

Modifier and Type	Method and Description
static <O extends ImageGray> O[]	declareOutput(ImagePyramid<?> pyramid, java.lang.Class<O> outputType) Creates an array of single band images for each layer in the provided pyramid.
static <I extends ImageGray,O extends ImageGray> void	filter(ImagePyramid<I> input, FilterImageInterface<I,O> filter, O[] output) Runs an image filter through each layer in the pyramid.
static <I extends ImageGray,O extends ImageGray> void	gradient(ImagePyramid<I> input, ImageGradient<I,O> gradient, O[] derivX, O[] derivY) Computes the gradient for each image the pyramid.
static <I extends ImageGray,O extends ImageGray> void	hessian(O[] derivX, O[] derivY, ImageHessian<O> hessian, O[] derivXX, O[] derivYY, O[] derivXY) Computes the hessian (2nd order derivative) for each image the pyramid.
static <O extends ImageGray> void	reshapeOutput(ImagePyramid<?> pyramid, O[] output) Reshapes each image in the array to match the layers in the pyramid
static <T extends ImageGray> void	scaleDown2(T input, T output) Scales down the input by a factor of 2.
static <T extends ImageGray> void	scaleImageUp(T input, T output, int scale, InterpolatePixelS<T> interp) Scales an image up using interpolation

Methods inherited from class java.lang.Object

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

Constructor Detail

PyramidOps

public PyramidOps()

Method Detail

declareOutput

public static <O extends ImageGray> O[] declareOutput(ImagePyramid<?> pyramid,
                                                      java.lang.Class<O> outputType)

Creates an array of single band images for each layer in the provided pyramid. Each image will be the same size as the corresponding layer in the pyramid.

Type Parameters:

O - Output image type

Parameters:

pyramid - (Input) Image pyramid

outputType - (Input) Output image type

Returns:

An array of images

reshapeOutput

public static <O extends ImageGray> void reshapeOutput(ImagePyramid<?> pyramid,
                                                       O[] output)

Reshapes each image in the array to match the layers in the pyramid

Type Parameters:

O - Image type

Parameters:

pyramid - (Input) Image pyramid

output - (Output) List of images which is to be resized

filter

public static <I extends ImageGray,O extends ImageGray> void filter(ImagePyramid<I> input,
                                                                    FilterImageInterface<I,O> filter,
                                                                    O[] output)

Runs an image filter through each layer in the pyramid.

It is assumed that the output has the same scales as the input. If not initialized then it will be initialized. If already initialized it is assumed to be setup for the same input image size.

Parameters:

input - Input pyramid.

filter - Filter being applied to the pyramid.

output - Output pyramid where filter results are saved.

gradient

public static <I extends ImageGray,O extends ImageGray> void gradient(ImagePyramid<I> input,
                                                                      ImageGradient<I,O> gradient,
                                                                      O[] derivX,
                                                                      O[] derivY)

Computes the gradient for each image the pyramid.

It is assumed that the gradient has the same scales as the input. If not initialized then it will be initialized. If already initialized it is assumed to be setup for the same input image size.

Parameters:

input - Input pyramid.

gradient - Computes image gradient

derivX - Pyramid where x-derivative is stored.

derivY - Pyramid where y-derivative is stored.

hessian

public static <I extends ImageGray,O extends ImageGray> void hessian(O[] derivX,
                                                                     O[] derivY,
                                                                     ImageHessian<O> hessian,
                                                                     O[] derivXX,
                                                                     O[] derivYY,
                                                                     O[] derivXY)

Computes the hessian (2nd order derivative) for each image the pyramid.

Parameters:

derivX - (Input) Pyramid where x-derivative is stored.

derivY - (Input) Pyramid where y-derivative is stored.

hessian - (Input) Computes hessian from gradient

derivXX - (Output) Second derivative XX

derivYY - (Output) Second derivative YY

derivXY - (Output) Second derivative XY

scaleDown2

public static <T extends ImageGray> void scaleDown2(T input,
                                                    T output)

Scales down the input by a factor of 2. Every other pixel along both axises is skipped.

scaleImageUp

public static <T extends ImageGray> void scaleImageUp(T input,
                                                      T output,
                                                      int scale,
                                                      InterpolatePixelS<T> interp)

Scales an image up using interpolation

Parameters:

scale - How much larger the output image will be.