com.aspose.ocr

Class PreprocessingFilter

java.lang.Object

com.aspose.ocr.PreprocessingFilter

public class PreprocessingFilter
extends Object

Base class for image processing commands.

Author:

Aspose

Constructor Summary

Constructors

Constructor and Description
PreprocessingFilter()

Method Summary

Modifier and Type	Method and Description
void	add(PreprocessingFilter filter) Add the new filter to the collection to further run all operations.
static PreprocessingFilter	Binarize() Converts an image to black-and-white image.
static PreprocessingFilter	BinarizeAndDilate() Dilation adds pixels to the boundaries of objects in an image.
static PreprocessingFilter	ContrastCorrection() Contrast correction filter.
static PreprocessingFilter	Invert() Automatically inverts colors in a document image.
static PreprocessingFilter	Median() The median filter run through each element of the image and replace each pixel with the median of its neighboring pixels.
static PreprocessingFilter	Resize(int width, int height) Rescale image - Upscale or downscale image resolution.
static PreprocessingFilter	Resize(int width, int height, InterpolationFilterType type) Rescale image - upscale or downscale image resolution.
static PreprocessingFilter	Rotate(float angle) Rotate original image.
static PreprocessingFilter	Scale(float ratio) Rescale image - Upscale or downscale image resolution.
static PreprocessingFilter	Scale(float ratio, InterpolationFilterType type) Rescale image - Upscale or downscale image resolution.
static PreprocessingFilter	Threshold(int value) Create a binary image based on setting a threshold value on the pixel intensity of the original image.
static PreprocessingFilter	ToGrayscale() Converts an image to grayscale image.

Methods inherited from class java.lang.Object

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

Constructor Detail

PreprocessingFilter

public PreprocessingFilter()

Method Detail

Binarize

public static PreprocessingFilter Binarize()

Converts an image to black-and-white image. Binary images are images whose pixels have only two possible intensity values. They are normally displayed as black and white. Numerically, the two values are often 0 for black, and 255 for white. Binary images are produced by auto thresholding an image.

Returns:

BinarizeFilter object.

Resize

public static PreprocessingFilter Resize(int width,
                                         int height,
                                         InterpolationFilterType type)

Rescale image - upscale or downscale image resolution.

Parameters:

width - The new width of the image.

height - The new height of the image.

type - InterpolationFilterType @see InterpolationFilterType

Returns:

ResizeFilter object.

Resize

public static PreprocessingFilter Resize(int width,
                                         int height)

Rescale image - Upscale or downscale image resolution. InterpolationFilterType = bilinear or nearest neighbor @see InterpolationFilterType

Parameters:

width - The new width of the image.

height - The new height of the image.

Returns:

ResizeFilter object.

BinarizeAndDilate

public static PreprocessingFilter BinarizeAndDilate()

Dilation adds pixels to the boundaries of objects in an image.

Returns:

DilateFilter object.

Invert

public static PreprocessingFilter Invert()

Automatically inverts colors in a document image.

Returns:

InvertFilter object.

Rotate

public static PreprocessingFilter Rotate(float angle)

Rotate original image.

Parameters:

angle - Angle of rotation. Value from -360 to 360.

Returns:

RotateFilter object.

Scale

public static PreprocessingFilter Scale(float ratio)

Rescale image - Upscale or downscale image resolution. InterpolationFilterType default bilinear or nearest neighbor @see InterpolationFilterType

Parameters:

ratio - The scaling factor. Recommended value from 0.1 to 1 to shrink. From 1 to 10 to enlarge.

Returns:

ScaleFilter object.

Scale

public static PreprocessingFilter Scale(float ratio,
                                        InterpolationFilterType type)

Rescale image - Upscale or downscale image resolution.

Parameters:

ratio - The scaling factor. Recommended value from 0.1 to 1 to shrink. From 1 to 10 to enlarge.

type - InterpolationFilterType @see InterpolationFilterType

Returns:

ScaleFilter object.

ToGrayscale

public static PreprocessingFilter ToGrayscale()

Converts an image to grayscale image. Grayscale image have 256 level of light in image (0 to 255).

Returns:

GrayscaleFilter object.

Threshold

public static PreprocessingFilter Threshold(int value)

Create a binary image based on setting a threshold value on the pixel intensity of the original image.

Parameters:

value - The max value.

Returns:

BinarizeFilter object.

Median

public static PreprocessingFilter Median()

The median filter run through each element of the image and replace each pixel with the median of its neighboring pixels.

Returns:

MedianFilter object.

ContrastCorrection

public static PreprocessingFilter ContrastCorrection()

Contrast correction filter.

Returns:

ContrastCorrectionFilter object.

add

public void add(PreprocessingFilter filter)

Add the new filter to the collection to further run all operations. Consistency in the collection matters.

Parameters:

filter - New operation to add to filter list.