Operator Reference

write_ocr_trainfwrite_ocr_trainfWriteOcrTrainfWriteOcrTrainfwrite_ocr_trainf (Operator)

write_ocr_trainfwrite_ocr_trainfWriteOcrTrainfWriteOcrTrainfwrite_ocr_trainf — Storing of training characters into a file.

Signature

write_ocr_trainf(Character, Image : : Class, TrainingFile : )

Description

The operator write_ocr_trainfwrite_ocr_trainfWriteOcrTrainfWriteOcrTrainfwrite_ocr_trainf serves to prepare the training with the operator trainf_ocr_class_mlptrainf_ocr_class_mlpTrainfOcrClassMlpTrainfOcrClassMlptrainf_ocr_class_mlp or trainf_ocr_class_svmtrainf_ocr_class_svmTrainfOcrClassSvmTrainfOcrClassSvmtrainf_ocr_class_svm. Hereby regions, representing characters, including their gray values (region and pixel) and the corresponding class name will be written into a file. An arbitrary number of regions within one image is supported. For each character (region) in CharacterCharacterCharactercharactercharacter the corresponding class name must be specified in ClassClassClassclassValclass. The gray values are passed via the parameter ImageImageImageimageimage. If no file extension is specified in TrainingFileTrainingFileTrainingFiletrainingFiletraining_file the extension '.trf' is appended to the file name. The version of the file format used for writing data can be defined by the parameter 'ocr_trainf_version'"ocr_trainf_version""ocr_trainf_version""ocr_trainf_version""ocr_trainf_version" of the operator set_systemset_systemSetSystemSetSystemset_system.

Execution Information

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

Parameters

CharacterCharacterCharactercharactercharacter (input_object) region(-array) → object

Characters to be trained.

ImageImageImageimageimage (input_object) singlechannelimage → object (byte / uint2)

Gray values of the characters.

ClassClassClassclassValclass (input_control) string(-array) → (string)

Class (name) of the characters.

TrainingFileTrainingFileTrainingFiletrainingFiletraining_file (input_control) filename.write → (string)

Name of the training file.

Default: 'train_ocr' "train_ocr" "train_ocr" "train_ocr" "train_ocr"

File extension: .trf

Example (C)

char       name[128];
HTuple     Class,Name;

read_image(&Image,"character.tiff");
binary_threshold(Image,&Dark, 'otsu', 'dark', &UsedThreshold);
connection(Dark,&Character);
count_obj(Character,&num);
create_tuple(&Class,num);
open_window(0,0,-1,-1,0,"","",&WindowHandle);
set_color(WindowHandle,"red");
for (i=0; i<num; i++) {
  select_obj(Character,&SingleCharacter,i);
  disp_region(SingleCharacter,WindowHandle);
  printf("class of character %d ?\n",i);
  scanf("%s\n",name);
  set_s(Class,name,i);
}
create_tuple(&Name,1);
set_s(Class,Name,"trainfile");
T_write_ocr_trainf(Character,Image,Class,Name);

Result

If the parameters are correct, the operator write_ocr_trainfwrite_ocr_trainfWriteOcrTrainfWriteOcrTrainfwrite_ocr_trainf returns the value 2 ( H_MSG_TRUE) . Otherwise an exception will be raised.

Possible Predecessors

thresholdthresholdThresholdThresholdthreshold, connectionconnectionConnectionConnectionconnection, read_ocr_trainfread_ocr_trainfReadOcrTrainfReadOcrTrainfread_ocr_trainf

Possible Successors

trainf_ocr_class_mlptrainf_ocr_class_mlpTrainfOcrClassMlpTrainfOcrClassMlptrainf_ocr_class_mlp, trainf_ocr_class_svmtrainf_ocr_class_svmTrainfOcrClassSvmTrainfOcrClassSvmtrainf_ocr_class_svm

Module

OCR/OCV

Operators