public class Tesseract
extends java.lang.Object
TessAPI
, provides character recognition support for common image
formats, and multi-page TIFF images beyond the uncompressed, binary TIFF
format supported by Tesseract OCR engine. The extended capabilities are
provided by the
Java Advanced Imaging Image I/O Tools
. Ghost4J
, a
JNA
wrapper for
GPL Ghostscript
, which should be installed and included in
system path. .jar
files for
jna
,
jai-imageio
, and
ghost4j
) are in its compile and run-time
classpath
.Modifier and Type | Field and Description |
---|---|
static java.lang.String |
htmlBeginTag |
static java.lang.String |
htmlEndTag |
Modifier and Type | Method and Description |
---|---|
java.lang.String |
doOCR(java.awt.image.BufferedImage bi)
Performs OCR operation.
|
java.lang.String |
doOCR(java.awt.image.BufferedImage bi,
java.awt.Rectangle rect)
Performs OCR operation.
|
java.lang.String |
doOCR(java.io.File imageFile)
Performs OCR operation.
|
java.lang.String |
doOCR(java.io.File imageFile,
java.awt.Rectangle rect)
Performs OCR operation.
|
java.lang.String |
doOCR(int xsize,
int ysize,
java.nio.ByteBuffer buf,
java.awt.Rectangle rect,
int bpp)
Performs OCR operation.
|
java.lang.String |
doOCR(java.util.List<javax.imageio.IIOImage> imageList,
java.awt.Rectangle rect)
Performs OCR operation.
|
static Tesseract |
getInstance()
Gets an instance of the class library.
|
void |
setDatapath(java.lang.String datapath)
Sets tessdata path.
|
void |
setHocr(boolean hocr)
Enables hocr output.
|
void |
setLanguage(java.lang.String language)
Sets language for OCR.
|
void |
setOcrEngineMode(int ocrEngineMode)
Sets OCR engine mode.
|
void |
setPageSegMode(int mode)
Sets page segmentation mode.
|
void |
setTessVariable(java.lang.String key,
java.lang.String value)
Set the value of Tesseract's internal parameter.
|
public static final java.lang.String htmlBeginTag
public static final java.lang.String htmlEndTag
public static Tesseract getInstance()
public void setDatapath(java.lang.String datapath)
datapath
- the tessdata path to setpublic void setLanguage(java.lang.String language)
language
- the language code, which follows ISO 639-3 standard.public void setOcrEngineMode(int ocrEngineMode)
ocrEngineMode
- the OcrEngineMode to setpublic void setPageSegMode(int mode)
mode
- the page segmentation mode to setpublic void setHocr(boolean hocr)
hocr
- to enable or disable hocr outputpublic void setTessVariable(java.lang.String key, java.lang.String value)
key
- variable name, e.g.,
tessedit_create_hocr
,
tessedit_char_whitelist
, etc.value
- value for corresponding variable, e.g., "1", "0",
"0123456789", etc.public java.lang.String doOCR(java.io.File imageFile) throws TesseractException
imageFile
- an image fileTesseractException
public java.lang.String doOCR(java.io.File imageFile, java.awt.Rectangle rect) throws TesseractException
imageFile
- an image filerect
- the bounding rectangle defines the region of the image to be
recognized. A rectangle of zero dimension or
null
indicates the whole image.TesseractException
public java.lang.String doOCR(java.awt.image.BufferedImage bi) throws TesseractException
bi
- a buffered imageTesseractException
public java.lang.String doOCR(java.awt.image.BufferedImage bi, java.awt.Rectangle rect) throws TesseractException
bi
- a buffered imagerect
- the bounding rectangle defines the region of the image to be
recognized. A rectangle of zero dimension or
null
indicates the whole image.TesseractException
public java.lang.String doOCR(java.util.List<javax.imageio.IIOImage> imageList, java.awt.Rectangle rect) throws TesseractException
imageList
- a list of
IIOImage
objectsrect
- the bounding rectangle defines the region of the image to be
recognized. A rectangle of zero dimension or
null
indicates the whole image.TesseractException
public java.lang.String doOCR(int xsize, int ysize, java.nio.ByteBuffer buf, java.awt.Rectangle rect, int bpp) throws TesseractException
SetImage
, (optionally)
SetRectangle
, and one or more of the
Get*Text
functions.xsize
- width of imageysize
- height of imagebuf
- pixel datarect
- the bounding rectangle defines the region of the image to be
recognized. A rectangle of zero dimension or
null
indicates the whole image.bpp
- bits per pixel, represents the bit depth of the image, with 1
for binary bitmap, 8 for gray, and 24 for color RGB.TesseractException