Operator Reference

HALCON Operator Reference / OCR / Convolutional Neural Networks

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read_ocr_class_cnnT_read_ocr_class_cnnReadOcrClassCnnReadOcrClassCnnread_ocr_class_cnn (Operator)

read_ocr_class_cnnT_read_ocr_class_cnnReadOcrClassCnnReadOcrClassCnnread_ocr_class_cnn — 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)

def read_ocr_class_cnn(file_name: str) -> HHandle

Description

read_ocr_class_cnnread_ocr_class_cnnReadOcrClassCnnReadOcrClassCnnread_ocr_class_cnn 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_cnnReadOcrClassCnnReadOcrClassCnnread_ocr_class_cnn and subsequently used for classification with either do_ocr_single_class_cnndo_ocr_single_class_cnnDoOcrSingleClassCnnDoOcrSingleClassCnndo_ocr_single_class_cnn, do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnndo_ocr_multi_class_cnn, or do_ocr_word_cnndo_ocr_word_cnnDoOcrWordCnnDoOcrWordCnndo_ocr_word_cnn.

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

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

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

FileNameFileNameFileNamefileNamefile_name (input_control)  filename.read → HTuplestrHTupleHtuple (string) (string) (HString) (char*)

File name.

Default: '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, HTupleHHandleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)

Handle of the OCR classifier.

Result

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

Possible Successors

do_ocr_single_class_cnndo_ocr_single_class_cnnDoOcrSingleClassCnnDoOcrSingleClassCnndo_ocr_single_class_cnn, do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnndo_ocr_multi_class_cnn, do_ocr_word_cnndo_ocr_word_cnnDoOcrWordCnnDoOcrWordCnndo_ocr_word_cnn

See also

get_params_ocr_class_cnnget_params_ocr_class_cnnGetParamsOcrClassCnnGetParamsOcrClassCnnget_params_ocr_class_cnn

Module

OCR/OCV

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