traind_ocr_class_boxT_traind_ocr_class_boxTraindOcrClassBoxTraindOcrClassBox (Operator)

Name

traind_ocr_class_boxT_traind_ocr_class_boxTraindOcrClassBoxTraindOcrClassBox — Train an OCR classifier by the input of regions.

Warning

traind_ocr_class_boxtraind_ocr_class_boxTraindOcrClassBoxTraindOcrClassBoxTraindOcrClassBox is obsolete and is only provided for reasons of backward compatibility. New applications should use the MLP, SVM or CNN based operators instead.

Signature

Description

The operator traind_ocr_class_boxtraind_ocr_class_boxTraindOcrClassBoxTraindOcrClassBoxTraindOcrClassBox trains the classifier directly via the input of regions in an image. Any number of regions of an image can be passed. For each character (region) in CharacterCharacterCharacterCharactercharacter the corresponding name (class) ClassClassClassClassclassVal must be specified. The gray values are passed in ImageImageImageImageimage. When the procedure has finished the parameter AvgConfidenceAvgConfidenceAvgConfidenceAvgConfidenceavgConfidence provides information about the success of the training: It contains the average confidence of the trained characters measured by a re-classification. The confidence of mismatched characters is set to 0 (thus, the average confidence will be decreased significantly).

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 modifies the state of the following input parameter:

• OcrHandleOcrHandleOcrHandleOcrHandleocrHandle

Parameters

char name[128];
Hlong orc_handle;

read_ocr("testnet",&orc_handle);
read_image(&Image,"character.tiff");
binary_threshold(Image,&Dark, 'otsu', 'dark', &UsedThreshold);
connection(Dark,&Character);
count_obj(Character,&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);
  traind_ocr_class_box(SingleCharacter,Image,OcrHandle,name,&AvgConfidence);
}

Result

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

Possible Predecessors

create_ocr_class_boxcreate_ocr_class_boxCreateOcrClassBoxCreateOcrClassBoxCreateOcrClassBox, read_ocrread_ocrReadOcrReadOcrReadOcr

Possible Successors

write_ocrwrite_ocrWriteOcrWriteOcrWriteOcr, do_ocr_multido_ocr_multiDoOcrMultiDoOcrMultiDoOcrMulti, do_ocr_singledo_ocr_singleDoOcrSingleDoOcrSingleDoOcrSingle

Alternatives

trainf_ocr_class_boxtrainf_ocr_class_boxTrainfOcrClassBoxTrainfOcrClassBoxTrainfOcrClassBox

Module

OCR/OCV