do_ocr_singleT_do_ocr_singleDoOcrSingleDoOcrSingledo_ocr_single (Operator)

Name

do_ocr_singleT_do_ocr_singleDoOcrSingleDoOcrSingledo_ocr_single — Classify one character.

Warning

do_ocr_singledo_ocr_singleDoOcrSingleDoOcrSingledo_ocr_single is obsolete and is only provided for reasons of backward compatibility.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

Signature

do_ocr_single(Character, Image : : OcrHandle : Classes, Confidences)

Description

The operator do_ocr_singledo_ocr_singleDoOcrSingleDoOcrSingledo_ocr_single assigns classes to the CharacterCharacterCharactercharactercharacter (characters). For gray value features gray values of the surrounding rectangles of the regions will be used. The gray values will be taken from the parameter ImageImageImageimageimage. For each character the two classes with the highest confidences will be returned in ClassesClassesClassesclassesclasses. The corresponding confidences will be returned in ConfidencesConfidencesConfidencesconfidencesconfidences. The confidence value indicates the similarity between the input pattern and the assigned character.

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 → object

Character to be recognized.

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

Gray values of the characters.

OcrHandleOcrHandleOcrHandleocrHandleocr_handle (input_control) ocr_box → (handle)

ID of the OCR classifier.

ClassesClassesClassesclassesclasses (output_control) string-array → (string)

Classes (names) of the characters.

Number of elements: 2

ConfidencesConfidencesConfidencesconfidencesconfidences (output_control) real-array → (real)

Confidence values of the characters.

Number of elements: 2

Example (C)

HTuple  Classes,Confidences;
Hlong    orc_handle;
HTuple  OcrHandle;

read_ocr("testnet",&orc_handle);
create_tuple(&OcrHandle,1);
set_i(OcrHandle,orc_handle,0);
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);
for (i=0; i<num; i++) {
  select_obj(Character,&SingleCharacter,i);
  T_do_ocr_single(SingleCharacter,Image,
                  OcrHandle,&Classes,&Confidences);
  printf("best   = %s (%g)\n",
         get_s(Classes,0),get_d(Confidences,0));
  printf("second = %s (%g)\n\n",
         get_s(Classes,1),get_d(Confidences,1));
}

Result

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

Possible Predecessors

traind_ocr_class_boxtraind_ocr_class_boxTraindOcrClassBoxTraindOcrClassBoxtraind_ocr_class_box, trainf_ocr_class_boxtrainf_ocr_class_boxTrainfOcrClassBoxTrainfOcrClassBoxtrainf_ocr_class_box, read_ocrread_ocrReadOcrReadOcrread_ocr, connectionconnectionConnectionConnectionconnection, sort_regionsort_regionSortRegionSortRegionsort_region

Alternatives

do_ocr_multido_ocr_multiDoOcrMultiDoOcrMultido_ocr_multi

Module

OCR/OCV

Operators