Package boofcv.alg.enhance

Class EnhanceImageOps

java.lang.Object

boofcv.alg.enhance.EnhanceImageOps

public class EnhanceImageOps
extends Object

Operations for improving the visibility of images. See [1] for a discussion of algorithms found in this class.

[1] R. C. Gonzalez, R. E. Woods, "Digitial Image Processing" 2nd Ed. 2002

Field Summary

Fields

Modifier and Type	Field	Description
static Kernel2D_F32	kernelEnhance4_F32
static Kernel2D_S32	kernelEnhance4_I32
static Kernel2D_F32	kernelEnhance8_F32
static Kernel2D_S32	kernelEnhance8_I32

Constructor Summary

Constructors

Constructor	Description
EnhanceImageOps()

Method Summary

Modifier and Type	Method	Description
static void	applyTransform(GrayS16 input, int[] transform, int minValue, GrayS16 output)	Applies the transformation table to the provided input image.
static void	applyTransform(GrayS32 input, int[] transform, int minValue, GrayS32 output)	Applies the transformation table to the provided input image.
static void	applyTransform(GrayS8 input, int[] transform, int minValue, GrayS8 output)	Applies the transformation table to the provided input image.
static void	applyTransform(GrayU16 input, int[] transform, GrayU16 output)	Applies the transformation table to the provided input image.
static void	applyTransform(GrayU8 input, int[] transform, GrayU8 output)	Applies the transformation table to the provided input image.
static void	equalize(int[] histogram, int[] transform)	Computes a transformation table which will equalize the provided histogram.
static void	equalizeLocal(GrayU16 input, int radius, GrayU16 output, int histogramLength, @Nullable GrowArray<DogArray_I32> workspaces)	Equalizes the local image histogram on a per pixel basis.
static void	equalizeLocal(GrayU8 input, int radius, GrayU8 output, int histogramLength, @Nullable GrowArray<DogArray_I32> workspaces)	Equalizes the local image histogram on a per pixel basis.
static void	sharpen4(GrayF32 input, GrayF32 output)	Applies a Laplacian-4 based sharpen filter to the image.
static void	sharpen4(GrayU8 input, GrayU8 output)	Applies a Laplacian-4 based sharpen filter to the image.
static void	sharpen8(GrayF32 input, GrayF32 output)	Applies a Laplacian-8 based sharpen filter to the image.
static void	sharpen8(GrayU8 input, GrayU8 output)	Applies a Laplacian-8 based sharpen filter to the image.

Methods inherited from class java.lang.Object

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

Field Details

kernelEnhance4_I32

public static Kernel2D_S32 kernelEnhance4_I32

kernelEnhance4_F32

public static Kernel2D_F32 kernelEnhance4_F32

kernelEnhance8_I32

public static Kernel2D_S32 kernelEnhance8_I32

kernelEnhance8_F32

public static Kernel2D_F32 kernelEnhance8_F32

Constructor Details

EnhanceImageOps

public EnhanceImageOps()

Method Details

equalize

public static void equalize(int[] histogram,
int[] transform)

Computes a transformation table which will equalize the provided histogram. An equalized histogram spreads the 'weight' across the whole spectrum of values. Often used to make dim images easier for people to see.

Parameters:

histogram - Input image histogram.

transform - Output transformation table.

applyTransform

public static void applyTransform(GrayU8 input,
int[] transform,
GrayU8 output)

Applies the transformation table to the provided input image.

Parameters:

input - Input image.

transform - Input transformation table.

output - Output image.

applyTransform

public static void applyTransform(GrayU16 input,
int[] transform,
GrayU16 output)

Applies the transformation table to the provided input image.

Parameters:

input - Input image.

transform - Input transformation table.

output - Output image.

applyTransform

public static void applyTransform(GrayS8 input,
int[] transform,
int minValue,
GrayS8 output)

Applies the transformation table to the provided input image.

Parameters:

input - Input image.

minValue - Minimum possible pixel value.

transform - Input transformation table.

output - Output image.

applyTransform

public static void applyTransform(GrayS16 input,
int[] transform,
int minValue,
GrayS16 output)

Applies the transformation table to the provided input image.

Parameters:

input - Input image.

minValue - Minimum possible pixel value.

transform - Input transformation table.

output - Output image.

applyTransform

public static void applyTransform(GrayS32 input,
int[] transform,
int minValue,
GrayS32 output)

Applies the transformation table to the provided input image.

Parameters:

input - Input image.

minValue - Minimum possible pixel value.

transform - Input transformation table.

output - Output image.

equalizeLocal

public static void equalizeLocal(GrayU8 input,
int radius,
GrayU8 output,
int histogramLength,
@Nullable
@Nullable GrowArray<DogArray_I32> workspaces)

Equalizes the local image histogram on a per pixel basis.

Parameters:

input - Input image.

radius - Radius of square local histogram.

output - Output image.

histogramLength - Number of elements in the histogram. 256 for 8-bit images

workspaces - (Optional) Used to create work arrays. Nullable

equalizeLocal

public static void equalizeLocal(GrayU16 input,
int radius,
GrayU16 output,
int histogramLength,
@Nullable
@Nullable GrowArray<DogArray_I32> workspaces)

Equalizes the local image histogram on a per pixel basis.

Parameters:

input - Input image.

radius - Radius of square local histogram.

output - Output image.

histogramLength - Number of elements in the histogram. 256 for 8-bit images

workspaces - Used to create work arrays. can be null

sharpen4

public static void sharpen4(GrayU8 input,
GrayU8 output)

Applies a Laplacian-4 based sharpen filter to the image.

Parameters:

input - Input image.

output - Output image.

sharpen4

public static void sharpen4(GrayF32 input,
GrayF32 output)

Applies a Laplacian-4 based sharpen filter to the image.

Parameters:

input - Input image.

output - Output image.

sharpen8

public static void sharpen8(GrayU8 input,
GrayU8 output)

Applies a Laplacian-8 based sharpen filter to the image.

Parameters:

input - Input image.

output - Output image.

sharpen8

public static void sharpen8(GrayF32 input,
GrayF32 output)

Applies a Laplacian-8 based sharpen filter to the image.

Parameters:

input - Input image.

output - Output image.