net.sourceforge.tess4j.util

Class ImageIOHelper

java.lang.Object

net.sourceforge.tess4j.util.ImageIOHelper

public class ImageIOHelper
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	JAI_IMAGE_READER_MESSAGE
static java.lang.String	JAI_IMAGE_WRITER_MESSAGE
static java.lang.String	TIFF_EXT

Constructor Summary

Constructors

Constructor and Description
ImageIOHelper()

Method Summary

Modifier and Type	Method and Description
static java.nio.ByteBuffer	convertImageData(java.awt.image.BufferedImage bi) Converts BufferedImage to ByteBuffer.
static java.awt.image.BufferedImage	convertRenderedImage(java.awt.image.RenderedImage image) Converts RenderedImage to BufferedImage.
static java.util.List<java.io.File>	createTiffFiles(java.io.File imageFile, int index) Creates a list of TIFF image files from an image file.
static java.util.List<java.io.File>	createTiffFiles(java.io.File imageFile, int index, boolean preserve) Creates a list of TIFF image files from an image file.
static java.util.List<java.io.File>	createTiffFiles(java.util.List<javax.imageio.IIOImage> imageList, int index) Creates a list of TIFF image files from a list of IIOImage objects.
static java.util.List<java.io.File>	createTiffFiles(java.util.List<javax.imageio.IIOImage> imageList, int index, int dpiX, int dpiY)
static java.io.File	deskewImage(java.io.File imageFile, double minimumDeskewThreshold) Deskews image.
static javax.imageio.IIOImage	getIIOImage(java.awt.image.BufferedImage bi) Gets an IIOImage object for a BufferedImage.
static java.util.List<javax.imageio.IIOImage>	getIIOImageList(java.io.File inputFile) Gets a list of IIOImage objects for an image file.
static java.nio.ByteBuffer	getImageByteBuffer(javax.imageio.IIOImage image) Gets pixel data of an IIOImage object.
static java.nio.ByteBuffer	getImageByteBuffer(java.awt.image.RenderedImage image) Gets pixel data of an RenderedImage object.
static java.io.File	getImageFile(java.io.File inputFile) Gets image file.
static java.lang.String	getImageFileFormat(java.io.File imageFile) Gets image file format.
static java.util.List<java.awt.image.BufferedImage>	getImageList(java.io.File inputFile) Gets a list of BufferedImage objects for an image file.
static void	mergeTiff(java.awt.image.BufferedImage[] inputImages, java.io.File outputTiff) Merges multiple images into one multi-page TIFF image.
static void	mergeTiff(java.awt.image.BufferedImage[] inputImages, java.io.File outputTiff, java.lang.String compressionType) Merges multiple images into one multi-page TIFF image.
static void	mergeTiff(java.io.File[] inputImages, java.io.File outputTiff) Merges multiple images into one multi-page TIFF image.
static void	mergeTiff(java.util.List<javax.imageio.IIOImage> imageList, java.io.File outputTiff) Merges multiple images into one multi-page TIFF image.
static void	mergeTiff(java.util.List<javax.imageio.IIOImage> imageList, java.io.File outputTiff, java.lang.String compressionType) Merges multiple images into one multi-page TIFF image.
static java.util.Map<java.lang.String,java.lang.String>	readImageData(javax.imageio.IIOImage oimage) Reads image meta data.

Methods inherited from class java.lang.Object

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

Field Detail

TIFF_EXT

public static final java.lang.String TIFF_EXT

See Also:

Constant Field Values

JAI_IMAGE_WRITER_MESSAGE

public static final java.lang.String JAI_IMAGE_WRITER_MESSAGE

See Also:

Constant Field Values

JAI_IMAGE_READER_MESSAGE

public static final java.lang.String JAI_IMAGE_READER_MESSAGE

See Also:

Constant Field Values

Constructor Detail

ImageIOHelper

public ImageIOHelper()

Method Detail

createTiffFiles

public static java.util.List<java.io.File> createTiffFiles(java.io.File imageFile,
                                                           int index)
                                                    throws java.io.IOException

Creates a list of TIFF image files from an image file. It basically converts images of other formats to TIFF format, or a multi-page TIFF image to multiple TIFF image files.

Parameters:

imageFile - input image file

index - an index of the page; -1 means all pages, as in a multi-page TIFF image

Returns:

a list of TIFF image files

Throws:

java.io.IOException

createTiffFiles

public static java.util.List<java.io.File> createTiffFiles(java.io.File imageFile,
                                                           int index,
                                                           boolean preserve)
                                                    throws java.io.IOException

Creates a list of TIFF image files from an image file. It basically converts images of other formats to TIFF format, or a multi-page TIFF image to multiple TIFF image files.

Parameters:

imageFile - input image file

index - an index of the page; -1 means all pages, as in a multi-page TIFF image

preserve - preserve compression mode

Returns:

a list of TIFF image files

Throws:

java.io.IOException

createTiffFiles

public static java.util.List<java.io.File> createTiffFiles(java.util.List<javax.imageio.IIOImage> imageList,
                                                           int index)
                                                    throws java.io.IOException

Creates a list of TIFF image files from a list of IIOImage objects.

Parameters:

imageList - a list of IIOImage objects

index - an index of the page; -1 means all pages

Returns:

a list of TIFF image files

Throws:

java.io.IOException

createTiffFiles

public static java.util.List<java.io.File> createTiffFiles(java.util.List<javax.imageio.IIOImage> imageList,
                                                           int index,
                                                           int dpiX,
                                                           int dpiY)
                                                    throws java.io.IOException

Throws:

java.io.IOException

getImageByteBuffer

public static java.nio.ByteBuffer getImageByteBuffer(javax.imageio.IIOImage image)

Gets pixel data of an IIOImage object.

Parameters:

image - an IIOImage object

Returns:

a byte buffer of pixel data

getImageByteBuffer

public static java.nio.ByteBuffer getImageByteBuffer(java.awt.image.RenderedImage image)

Gets pixel data of an RenderedImage object.

Parameters:

image - an RenderedImage object

Returns:

a byte buffer of pixel data

convertImageData

public static java.nio.ByteBuffer convertImageData(java.awt.image.BufferedImage bi)

Converts BufferedImage to ByteBuffer.

Parameters:

bi - Input image

Returns:

pixel data

convertRenderedImage

public static java.awt.image.BufferedImage convertRenderedImage(java.awt.image.RenderedImage image)

Converts RenderedImage to BufferedImage.

Parameters:

image - Input RenderedImage

Returns:

BufferedImage

getImageFileFormat

public static java.lang.String getImageFileFormat(java.io.File imageFile)

Gets image file format.

Parameters:

imageFile - input image file

Returns:

image file format

getImageFile

public static java.io.File getImageFile(java.io.File inputFile)
                                 throws java.io.IOException

Gets image file. Convert to multi-page TIFF if given PDF.

Parameters:

inputFile - input file (common image or PDF)

Returns:

image file

Throws:

java.io.IOException

getImageList

public static java.util.List<java.awt.image.BufferedImage> getImageList(java.io.File inputFile)
                                                                 throws java.io.IOException

Gets a list of BufferedImage objects for an image file.

Parameters:

inputFile - input image file. It can be any of the supported formats, including TIFF, JPEG, GIF, PNG, BMP, JPEG, and PDF

Returns:

a list of BufferedImage objects

Throws:

java.io.IOException

getIIOImageList

public static java.util.List<javax.imageio.IIOImage> getIIOImageList(java.io.File inputFile)
                                                              throws java.io.IOException

Gets a list of IIOImage objects for an image file.

Parameters:

inputFile - input image file. It can be any of the supported formats, including TIFF, JPEG, GIF, PNG, BMP, JPEG, and PDF

Returns:

a list of IIOImage objects

Throws:

java.io.IOException

getIIOImage

public static javax.imageio.IIOImage getIIOImage(java.awt.image.BufferedImage bi)

Gets an IIOImage object for a BufferedImage.

Parameters:

bi - input image

Returns:

an IIOImage object

mergeTiff

public static void mergeTiff(java.io.File[] inputImages,
                             java.io.File outputTiff)
                      throws java.io.IOException

Merges multiple images into one multi-page TIFF image.

Parameters:

inputImages - an array of image files

outputTiff - the output multi-page TIFF file

Throws:

java.io.IOException

mergeTiff

public static void mergeTiff(java.awt.image.BufferedImage[] inputImages,
                             java.io.File outputTiff)
                      throws java.io.IOException

Merges multiple images into one multi-page TIFF image.

Parameters:

inputImages - an array of BufferedImage

outputTiff - the output TIFF file

Throws:

java.io.IOException

mergeTiff

public static void mergeTiff(java.awt.image.BufferedImage[] inputImages,
                             java.io.File outputTiff,
                             java.lang.String compressionType)
                      throws java.io.IOException

Merges multiple images into one multi-page TIFF image.

Parameters:

inputImages - an array of BufferedImage

outputTiff - the output TIFF file

compressionType - valid values: LZW, CCITT T.6, PackBits

Throws:

java.io.IOException

mergeTiff

public static void mergeTiff(java.util.List<javax.imageio.IIOImage> imageList,
                             java.io.File outputTiff)
                      throws java.io.IOException

Merges multiple images into one multi-page TIFF image.

Parameters:

imageList - a list of IIOImage objects

outputTiff - the output TIFF file

Throws:

java.io.IOException

mergeTiff

public static void mergeTiff(java.util.List<javax.imageio.IIOImage> imageList,
                             java.io.File outputTiff,
                             java.lang.String compressionType)
                      throws java.io.IOException

Merges multiple images into one multi-page TIFF image.

Parameters:

imageList - a list of IIOImage objects

outputTiff - the output TIFF file

compressionType - valid values: LZW, CCITT T.6, PackBits

Throws:

java.io.IOException

deskewImage

public static java.io.File deskewImage(java.io.File imageFile,
                                       double minimumDeskewThreshold)
                                throws java.io.IOException

Deskews image.

Parameters:

imageFile - input image

minimumDeskewThreshold - minimum deskew threshold (typically, 0.05d)

Returns:

temporary multi-page TIFF image file

Throws:

java.io.IOException

readImageData

public static java.util.Map<java.lang.String,java.lang.String> readImageData(javax.imageio.IIOImage oimage)

Reads image meta data.

Parameters:

oimage - input image

Returns:

a map of meta data