OpenCVForUnity.TextModule.OCRHMMDecoder Class Reference

OCRHMMDecoder class provides an interface for OCR using Hidden Markov Models. More...

Public Member Functions
string	run (Mat image, int min_confidence)
	Recognize text using HMM.
string	run (Mat image, int min_confidence, int component_level)
	Recognize text using HMM.
string	run (Mat image, Mat mask, int min_confidence)
string	run (Mat image, Mat mask, int min_confidence, int component_level)
Public Member Functions inherited from OpenCVForUnity.TextModule.BaseOCR
IntPtr	getNativeObjAddr ()
Public Member Functions inherited from OpenCVForUnity.DisposableObject
void	Dispose ()
void	ThrowIfDisposed ()

Static Public Member Functions
static new OCRHMMDecoder	__fromPtr__ (IntPtr addr)
static OCRHMMDecoder	create (OCRHMMDecoder_ClassifierCallback classifier, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table)
	Creates an instance of the OCRHMMDecoder class. Initializes HMMDecoder.
static OCRHMMDecoder	create (OCRHMMDecoder_ClassifierCallback classifier, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table, int mode)
	Creates an instance of the OCRHMMDecoder class. Initializes HMMDecoder.
static OCRHMMDecoder	create (string filename, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table)
	Creates an instance of the OCRHMMDecoder class. Loads and initializes HMMDecoder from the specified path.
static OCRHMMDecoder	create (string filename, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table, int mode)
	Creates an instance of the OCRHMMDecoder class. Loads and initializes HMMDecoder from the specified path.
static OCRHMMDecoder	create (string filename, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table, int mode, int classifier)
	Creates an instance of the OCRHMMDecoder class. Loads and initializes HMMDecoder from the specified path.
Static Public Member Functions inherited from OpenCVForUnity.TextModule.BaseOCR
static BaseOCR	__fromPtr__ (IntPtr addr)
Static Public Member Functions inherited from OpenCVForUnity.DisposableObject
static IntPtr	ThrowIfNullIntPtr (IntPtr ptr)

Protected Member Functions
override void	Dispose (bool disposing)
Protected Member Functions inherited from OpenCVForUnity.TextModule.BaseOCR
Protected Member Functions inherited from OpenCVForUnity.DisposableOpenCVObject
	DisposableOpenCVObject ()
	DisposableOpenCVObject (bool isEnabledDispose)
	DisposableOpenCVObject (IntPtr ptr)
	DisposableOpenCVObject (IntPtr ptr, bool isEnabledDispose)
Protected Member Functions inherited from OpenCVForUnity.DisposableObject
	DisposableObject ()
	DisposableObject (bool isEnabledDispose)

Additional Inherited Members
Package Functions inherited from OpenCVForUnity.TextModule.BaseOCR
Package Attributes inherited from OpenCVForUnity.DisposableOpenCVObject
Properties inherited from OpenCVForUnity.DisposableObject
bool	IsDisposed [get, protected set]
bool	IsEnabledDispose [get, set]

Detailed Description

OCRHMMDecoder class provides an interface for OCR using Hidden Markov Models.

Note

• (C++) An example on using OCRHMMDecoder recognition combined with scene text detection can be found at the webcam_demo sample: <https://github.com/opencv/opencv_contrib/blob/master/modules/text/samples/webcam_demo.cpp&gt;

Member Function Documentation

__fromPtr__()

static new OCRHMMDecoder OpenCVForUnity.TextModule.OCRHMMDecoder.__fromPtr__ ( IntPtr addr )

static

create() [1/5]

static OCRHMMDecoder OpenCVForUnity.TextModule.OCRHMMDecoder.create ( OCRHMMDecoder_ClassifierCallback classifier, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table )

static

Creates an instance of the OCRHMMDecoder class. Initializes HMMDecoder.

Parameters

classifier	The character classifier with built in feature extractor.
vocabulary	The language vocabulary (chars when ascii english text). vocabulary.size() must be equal to the number of classes of the classifier.
transition_probabilities_table	Table with transition probabilities between character pairs. cols == rows == vocabulary.size().
emission_probabilities_table	Table with observation emission probabilities. cols == rows == vocabulary.size().
mode	HMM Decoding algorithm. Only OCR_DECODER_VITERBI is available for the moment (<http://en.wikipedia.org/wiki/Viterbi_algorithm&gt;).

create() [2/5]

static OCRHMMDecoder OpenCVForUnity.TextModule.OCRHMMDecoder.create ( OCRHMMDecoder_ClassifierCallback classifier, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table, int mode )

static

Creates an instance of the OCRHMMDecoder class. Initializes HMMDecoder.

Parameters

classifier	The character classifier with built in feature extractor.
vocabulary	The language vocabulary (chars when ascii english text). vocabulary.size() must be equal to the number of classes of the classifier.
transition_probabilities_table	Table with transition probabilities between character pairs. cols == rows == vocabulary.size().
emission_probabilities_table	Table with observation emission probabilities. cols == rows == vocabulary.size().
mode	HMM Decoding algorithm. Only OCR_DECODER_VITERBI is available for the moment (<http://en.wikipedia.org/wiki/Viterbi_algorithm&gt;).

create() [3/5]

static OCRHMMDecoder OpenCVForUnity.TextModule.OCRHMMDecoder.create ( string filename, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table )

static

Creates an instance of the OCRHMMDecoder class. Loads and initializes HMMDecoder from the specified path.

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

create() [4/5]

static OCRHMMDecoder OpenCVForUnity.TextModule.OCRHMMDecoder.create ( string filename, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table, int mode )

static

Creates an instance of the OCRHMMDecoder class. Loads and initializes HMMDecoder from the specified path.

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

create() [5/5]

static OCRHMMDecoder OpenCVForUnity.TextModule.OCRHMMDecoder.create ( string filename, string vocabulary, Mat transition_probabilities_table, Mat emission_probabilities_table, int mode, int classifier )

static

Creates an instance of the OCRHMMDecoder class. Loads and initializes HMMDecoder from the specified path.

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Dispose()

override void OpenCVForUnity.TextModule.OCRHMMDecoder.Dispose ( bool disposing )

protectedvirtual

Reimplemented from OpenCVForUnity.TextModule.BaseOCR.

run() [1/4]

string OpenCVForUnity.TextModule.OCRHMMDecoder.run	(	Mat	image,
		int	min_confidence )

Recognize text using HMM.

Takes an image and a mask (where each connected component corresponds to a segmented character) on input and returns recognized text in the output_text parameter. Optionally provides also the Rects for individual text elements found (e.g. words), and the list of those text elements with their confidence values.

Parameters

image	Input image CV_8UC1 or CV_8UC3 with a single text line (or word).
mask	Input binary image CV_8UC1 same size as input image. Each connected component in mask corresponds to a segmented character in the input image.
output_text	Output text. Most likely character sequence found by the HMM decoder.
component_rects	If provided the method will output a list of Rects for the individual text elements found (e.g. words).
component_texts	If provided the method will output a list of text strings for the recognition of individual text elements found (e.g. words).
component_confidences	If provided the method will output a list of confidence values for the recognition of individual text elements found (e.g. words).
component_level	Only OCR_LEVEL_WORD is supported.

run() [2/4]

string OpenCVForUnity.TextModule.OCRHMMDecoder.run	(	Mat	image,
		int	min_confidence,
		int	component_level )

Recognize text using HMM.

Takes an image and a mask (where each connected component corresponds to a segmented character) on input and returns recognized text in the output_text parameter. Optionally provides also the Rects for individual text elements found (e.g. words), and the list of those text elements with their confidence values.

Parameters

image	Input image CV_8UC1 or CV_8UC3 with a single text line (or word).
mask	Input binary image CV_8UC1 same size as input image. Each connected component in mask corresponds to a segmented character in the input image.
output_text	Output text. Most likely character sequence found by the HMM decoder.
component_rects	If provided the method will output a list of Rects for the individual text elements found (e.g. words).
component_texts	If provided the method will output a list of text strings for the recognition of individual text elements found (e.g. words).
component_confidences	If provided the method will output a list of confidence values for the recognition of individual text elements found (e.g. words).
component_level	Only OCR_LEVEL_WORD is supported.

run() [3/4]

string OpenCVForUnity.TextModule.OCRHMMDecoder.run	(	Mat	image,
		Mat	mask,
		int	min_confidence )

run() [4/4]

string OpenCVForUnity.TextModule.OCRHMMDecoder.run	(	Mat	image,
		Mat	mask,
		int	min_confidence,
		int	component_level )

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The documentation for this class was generated from the following file:

• OpenCVForUnity/Assets/OpenCVForUnity/org/opencv_contrib/text/OCRHMMDecoder.cs