net.sourceforge.lept4j

Class L_Recoga

java.lang.Object

com.sun.jna.Structure

net.sourceforge.lept4j.L_Recoga

Direct Known Subclasses:

L_Recoga.ByReference, L_Recoga.ByValue

public class L_Recoga
extends com.sun.jna.Structure

recog.h
A simple utility for training and recognizing individual
machine-printed text characters. In an application, one can
envision using a number of these, one for each trained set.
In training mode, a set of labelled bitmaps is presented, either
one at a time, or in a directory, or in a pixa. If in a directory,
or a pixa, the labelling text string must be embedded in the
text field of the image file.
Any number of recognizers (L_Recog) can be trained and then used
together in an array (L_Recoga). All these trained structures
can be serialized to file and read back. The serialized version
holds all the bitmaps used for training, plus, for arbitrary
character sets, the UTF8 representation and the lookup table
mapping from the character representation to index.
There are three levels of "sets" here:
(1) Example set: the examples representing a character that
were printed in the same way, so that they can be combined
without scaling to form an "average" template for the character.
In the recognition phase, we use either this aligned average,
or the individual bitmaps. All examples in the set are given
the same character label. Example: the letter 'a' in the
predominant font in a book.
(2) Character set (represented by L_Recog, a single recognizer):
The set of different characters, each of which is described
by (1). Each element of the set has a different character
label. Example: the digits '0' through '9' that are used for
page numbering in a book.
(3) Recognizer set (represented by L_Recoga, an array of recogs):
A set of recognizers, each of which is described by (2).
In general, we do not want to combine the character sets
with the same labels within different recognizer sets,
because the bitmaps can differ in font type, style or size.
Example 1: the letter 'a' can be printed in two very different
ways (either with a large loop or with a smaller loop in
the lower half); both share the same label but need to be
distinguished so that they are not mixed when averaging.
Example 2: a recognizer trained for a book may be missing
some characters, so we need to supplement it with another
"generic" or "bootstrap" recognizer that has the additional
characters from a variety of sources. Bootstrap recognizers
must be run in a mode where all characters are scaled.
In the recognition process, for each component in an input image,
each recognizer (L_Recog) records the best match (highest
correlation score). If there is more than one recognizer, these
results are aggregated to find the best match for each character
for all the recognizers, and this is stored in L_Recoga.
native declaration : recog.h:53
This file was autogenerated by JNAerator,
a tool written by Olivier Chafik that uses a few opensource projects..
For help, please visit NativeLibs4Java or JNA.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	L_Recoga.ByReference
static class	L_Recoga.ByValue

Nested classes/interfaces inherited from class com.sun.jna.Structure

com.sun.jna.Structure.FieldOrder, com.sun.jna.Structure.StructField

Field Summary

Fields

Modifier and Type	Field	Description
int	n	number of recogs C type : l_int32
int	nalloc	number of recog ptrs allocated C type : l_int32
L_Rcha.ByReference	rcha	stores the array of best chars C type : L_Rcha*
com.sun.jna.ptr.PointerByReference	recog	recog ptr array C type : L_Recog**

Fields inherited from class com.sun.jna.Structure

ALIGN_DEFAULT, ALIGN_GNUC, ALIGN_MSVC, ALIGN_NONE, CALCULATE_SIZE

Constructor Summary

Constructors

Constructor	Description
L_Recoga()
L_Recoga(int n, int nalloc, com.sun.jna.ptr.PointerByReference recog, L_Rcha.ByReference rcha)
L_Recoga(com.sun.jna.Pointer peer)

Method Summary

Modifier and Type	Method	Description
protected java.util.List<java.lang.String>	getFieldOrder()	Gets this Structure's field names in their proper order.

Methods inherited from class com.sun.jna.Structure

allocateMemory, allocateMemory, autoAllocate, autoRead, autoRead, autoWrite, autoWrite, cacheTypeInfo, calculateSize, clear, createFieldsOrder, createFieldsOrder, createFieldsOrder, createFieldsOrder, dataEquals, dataEquals, ensureAllocated, equals, fieldOffset, getAutoRead, getAutoWrite, getFieldList, getFields, getNativeAlignment, getNativeSize, getNativeSize, getPointer, getStringEncoding, getStructAlignment, hashCode, newInstance, newInstance, read, readField, readField, setAlignType, setAutoRead, setAutoSynch, setAutoWrite, setStringEncoding, size, sortFields, toArray, toArray, toString, toString, useMemory, useMemory, write, writeField, writeField, writeField

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

n

public int n

number of recogs
C type : l_int32

nalloc

public int nalloc

number of recog ptrs allocated
C type : l_int32

recog

public com.sun.jna.ptr.PointerByReference recog

recog ptr array
C type : L_Recog**

rcha

public L_Rcha.ByReference rcha

stores the array of best chars
C type : L_Rcha*

Constructor Detail

L_Recoga

public L_Recoga()

L_Recoga

public L_Recoga(int n,
                int nalloc,
                com.sun.jna.ptr.PointerByReference recog,
                L_Rcha.ByReference rcha)

Parameters:

n - number of recogs
C type : l_int32

nalloc - number of recog ptrs allocated
C type : l_int32

recog - recog ptr array
C type : L_Recog**

rcha - stores the array of best chars
C type : L_Rcha*

L_Recoga

public L_Recoga(com.sun.jna.Pointer peer)

Method Detail

getFieldOrder

protected java.util.List<java.lang.String> getFieldOrder()

Gets this Structure's field names in their proper order.

Overrides:

getFieldOrder in class com.sun.jna.Structure

Returns:

list of ordered field names