boofcv.alg.filter.misc

Class AverageDownSampleOps

java.lang.Object

boofcv.alg.filter.misc.AverageDownSampleOps

public class AverageDownSampleOps
extends Object

Operations related to down sampling image by computing the average within square regions. The first square region is from (0,0) to (w-1,w-1), inclusive. Each square region after that is found by skipping over 'w' pixels in x and y directions. partial regions along the right and bottom borders are handled by computing the average with the rectangle defined by the intersection of the image and the square region.

NOTE: Errors are reduced in integer images by rounding instead of standard integer division.

Author:

Peter Abeles

Constructor Summary

Constructors

Constructor and Description
AverageDownSampleOps()

Method Summary

Methods

Modifier and Type	Method and Description
static void	down(ImageFloat32 input, int sampleWidth, ImageFloat32 output) Down samples the image.
static void	down(ImageFloat64 input, int sampleWidth, ImageFloat64 output) Down samples the image.
static void	down(ImageSingleBand input, int sampleWidth, ImageSingleBand output) Down samples image.
static void	down(ImageSInt16 input, int sampleWidth, ImageInt16 output) Down samples the image.
static void	down(ImageSInt32 input, int sampleWidth, ImageSInt32 output) Down samples the image.
static void	down(ImageSInt8 input, int sampleWidth, ImageInt8 output) Down samples the image.
static void	down(ImageUInt16 input, int sampleWidth, ImageInt16 output) Down samples the image.
static void	down(ImageUInt8 input, int sampleWidth, ImageInt8 output) Down samples the image.
static <T extends ImageSingleBand> void	down(MultiSpectral<T> input, int sampleWidth, MultiSpectral<T> output) Down samples a multi-spectral image.
static int	downSampleSize(int length, int squareWidth) Computes the length of a down sampled image based on the original length and the square width
static void	reshapeDown(ImageBase image, int inputWidth, int inputHeight, int squareWidth) Reshapes an image so that it is the correct size to store the down sampled image

Methods inherited from class java.lang.Object

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

Constructor Detail

AverageDownSampleOps

public AverageDownSampleOps()

Method Detail

downSampleSize

public static int downSampleSize(int length,
                 int squareWidth)

Computes the length of a down sampled image based on the original length and the square width

Parameters:

length - Length of side in input image

squareWidth - Width of region used to down sample images

Returns:

Length of side in down sampled image

reshapeDown

public static void reshapeDown(ImageBase image,
               int inputWidth,
               int inputHeight,
               int squareWidth)

Reshapes an image so that it is the correct size to store the down sampled image

down

public static void down(ImageSingleBand input,
        int sampleWidth,
        ImageSingleBand output)

Down samples image. Type checking is done at runtime.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.

down

public static <T extends ImageSingleBand> void down(MultiSpectral<T> input,
                                    int sampleWidth,
                                    MultiSpectral<T> output)

Down samples a multi-spectral image. Type checking is done at runtime.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.

down

public static void down(ImageUInt8 input,
        int sampleWidth,
        ImageInt8 output)

Down samples the image.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.

down

public static void down(ImageSInt8 input,
        int sampleWidth,
        ImageInt8 output)

Down samples the image.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.

down

public static void down(ImageUInt16 input,
        int sampleWidth,
        ImageInt16 output)

Down samples the image.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.

down

public static void down(ImageSInt16 input,
        int sampleWidth,
        ImageInt16 output)

Down samples the image.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.

down

public static void down(ImageSInt32 input,
        int sampleWidth,
        ImageSInt32 output)

Down samples the image.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.

down

public static void down(ImageFloat32 input,
        int sampleWidth,
        ImageFloat32 output)

Down samples the image.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.

down

public static void down(ImageFloat64 input,
        int sampleWidth,
        ImageFloat64 output)

Down samples the image.

Parameters:

input - Input image. Not modified.

sampleWidth - Width of square region.

output - Output image. Modified.