HALCON 19.11.0.0 / HALCON Operator Reference / OCR / Convolutional Neural Networks
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read_ocr_class_cnnT_read_ocr_class_cnnReadOcrClassCnnReadOcrClassCnn (Operator)

Name

read_ocr_class_cnnT_read_ocr_class_cnnReadOcrClassCnnReadOcrClassCnn — Read an CNN-based OCR classifier from a file.

Signature

read_ocr_class_cnn( : : FileName : OCRHandle)

Herror T_read_ocr_class_cnn(const Htuple FileName, Htuple* OCRHandle)

void ReadOcrClassCnn(const HTuple& FileName, HTuple* OCRHandle)

void HOCRCnn::HOCRCnn(const HString& FileName)

void HOCRCnn::HOCRCnn(const char* FileName)

void HOCRCnn::HOCRCnn(const wchar_t* FileName)   (Windows only)

void HOCRCnn::ReadOcrClassCnn(const HString& FileName)

void HOCRCnn::ReadOcrClassCnn(const char* FileName)

void HOCRCnn::ReadOcrClassCnn(const wchar_t* FileName)   (Windows only)

static void HOperatorSet.ReadOcrClassCnn(HTuple fileName, out HTuple OCRHandle)

public HOCRCnn(string fileName)

void HOCRCnn.ReadOcrClassCnn(string fileName)

Description

read_ocr_class_cnnread_ocr_class_cnnReadOcrClassCnnReadOcrClassCnnReadOcrClassCnn reads a pretrained OCR classifier based on a convolutional neural network (CNN).

The CNN-based OCR classifier is read with read_ocr_class_cnnread_ocr_class_cnnReadOcrClassCnnReadOcrClassCnnReadOcrClassCnn and subsequently used for classification with either do_ocr_single_class_cnndo_ocr_single_class_cnnDoOcrSingleClassCnnDoOcrSingleClassCnnDoOcrSingleClassCnn, do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnnDoOcrMultiClassCnn, or do_ocr_word_cnndo_ocr_word_cnnDoOcrWordCnnDoOcrWordCnnDoOcrWordCnn.

HALCON provides a number of pretrained OCR classifiers (see “Solution Guide I”, chapter 'OCR', section 'Pretrained OCR Fonts'). These pretrained OCR classifiers make it possible to read a wide variety of different fonts without the need to train an OCR classifier. Note that the pretrained OCR classifiers were trained with symbols that are printed dark on light.

Execution Information

This operator returns a handle. Note that the state of an instance of this handle type may be changed by specific operators even though the handle is used as an input parameter by those operators.

Parameters

FileNameFileNameFileNameFileNamefileName (input_control)  filename.read → HTupleHTupleHtuple (string) (string) (HString) (char*)

File name.

Default value: 'Universal_Rej.occ' "Universal_Rej.occ" "Universal_Rej.occ" "Universal_Rej.occ" "Universal_Rej.occ"

Suggested values: 'Universal_NoRej.occ'"Universal_NoRej.occ""Universal_NoRej.occ""Universal_NoRej.occ""Universal_NoRej.occ", 'Universal_Rej.occ'"Universal_Rej.occ""Universal_Rej.occ""Universal_Rej.occ""Universal_Rej.occ", 'Universal_0-9_NoRej.occ'"Universal_0-9_NoRej.occ""Universal_0-9_NoRej.occ""Universal_0-9_NoRej.occ""Universal_0-9_NoRej.occ", 'Universal_0-9_Rej.occ'"Universal_0-9_Rej.occ""Universal_0-9_Rej.occ""Universal_0-9_Rej.occ""Universal_0-9_Rej.occ", 'Universal_0-9+_NoRej.occ'"Universal_0-9+_NoRej.occ""Universal_0-9+_NoRej.occ""Universal_0-9+_NoRej.occ""Universal_0-9+_NoRej.occ", 'Universal_0-9+_Rej.occ'"Universal_0-9+_Rej.occ""Universal_0-9+_Rej.occ""Universal_0-9+_Rej.occ""Universal_0-9+_Rej.occ", 'Universal_0-9A-Z_NoRej.occ'"Universal_0-9A-Z_NoRej.occ""Universal_0-9A-Z_NoRej.occ""Universal_0-9A-Z_NoRej.occ""Universal_0-9A-Z_NoRej.occ", 'Universal_0-9A-Z_Rej.occ'"Universal_0-9A-Z_Rej.occ""Universal_0-9A-Z_Rej.occ""Universal_0-9A-Z_Rej.occ""Universal_0-9A-Z_Rej.occ", 'Universal_0-9A-Z+_NoRej.occ'"Universal_0-9A-Z+_NoRej.occ""Universal_0-9A-Z+_NoRej.occ""Universal_0-9A-Z+_NoRej.occ""Universal_0-9A-Z+_NoRej.occ", 'Universal_0-9A-Z+_Rej.occ'"Universal_0-9A-Z+_Rej.occ""Universal_0-9A-Z+_Rej.occ""Universal_0-9A-Z+_Rej.occ""Universal_0-9A-Z+_Rej.occ", 'Universal_A-Z+_NoRej.occ'"Universal_A-Z+_NoRej.occ""Universal_A-Z+_NoRej.occ""Universal_A-Z+_NoRej.occ""Universal_A-Z+_NoRej.occ", 'Universal_A-Z+_Rej.occ'"Universal_A-Z+_Rej.occ""Universal_A-Z+_Rej.occ""Universal_A-Z+_Rej.occ""Universal_A-Z+_Rej.occ"

File extension: .occ, .fnt

OCRHandleOCRHandleOCRHandleOCRHandleOCRHandle (output_control)  ocr_cnn → HOCRCnn, HTupleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)

Handle of the OCR classifier.

Result

If the parameters are valid, the operator read_ocr_class_cnnread_ocr_class_cnnReadOcrClassCnnReadOcrClassCnnReadOcrClassCnn returns the value 2 (H_MSG_TRUE). If necessary, an exception is raised.

Possible Successors

do_ocr_single_class_cnndo_ocr_single_class_cnnDoOcrSingleClassCnnDoOcrSingleClassCnnDoOcrSingleClassCnn, do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnnDoOcrMultiClassCnn, do_ocr_word_cnndo_ocr_word_cnnDoOcrWordCnnDoOcrWordCnnDoOcrWordCnn

See also

get_params_ocr_class_cnnget_params_ocr_class_cnnGetParamsOcrClassCnnGetParamsOcrClassCnnGetParamsOcrClassCnn

Module

OCR/OCV

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HALCON Operator Reference 19.11.0.0 Copyright © 1996-2019 MVTec Software GmbH