do_ocr_multi_class_knndo_ocr_multi_class_knnDoOcrMultiClassKnndo_ocr_multi_class_knnDoOcrMultiClassKnnDoOcrMultiClassKnn (Operator)

Name

do_ocr_multi_class_knndo_ocr_multi_class_knnDoOcrMultiClassKnndo_ocr_multi_class_knnDoOcrMultiClassKnnDoOcrMultiClassKnn — Classify multiple characters with an k-NN classifier.

Signature

Description

do_ocr_multi_class_knndo_ocr_multi_class_knnDoOcrMultiClassKnndo_ocr_multi_class_knnDoOcrMultiClassKnnDoOcrMultiClassKnn computes the best class for each of the characters given by the regions CharacterCharacterCharacterCharacterCharactercharacter and the gray values ImageImageImageImageImageimage with the k-NN classifier OCRHandleOCRHandleOCRHandleOCRHandleOCRHandleOCRHandle and returns the classes in ClassClassClassClassClassclassVal and the corresponding confidence of the classes in ConfidenceConfidenceConfidenceConfidenceConfidenceconfidence. The confidences lie between 0.0 and 1.0. The larger the value, the more reliable is the classification of the single characters. In contrast to do_ocr_single_class_knndo_ocr_single_class_knnDoOcrSingleClassKnndo_ocr_single_class_knnDoOcrSingleClassKnnDoOcrSingleClassKnn, do_ocr_multi_class_knndo_ocr_multi_class_knnDoOcrMultiClassKnndo_ocr_multi_class_knnDoOcrMultiClassKnnDoOcrMultiClassKnn can classify multiple characters in one call, and therefore typically is faster than a loop that uses do_ocr_single_class_knndo_ocr_single_class_knnDoOcrSingleClassKnndo_ocr_single_class_knnDoOcrSingleClassKnnDoOcrSingleClassKnn to classify single characters. However, do_ocr_multi_class_knndo_ocr_multi_class_knnDoOcrMultiClassKnndo_ocr_multi_class_knnDoOcrMultiClassKnnDoOcrMultiClassKnn can only return the best class of each character.

Before calling do_ocr_multi_class_knndo_ocr_multi_class_knnDoOcrMultiClassKnndo_ocr_multi_class_knnDoOcrMultiClassKnnDoOcrMultiClassKnn, the classifier must be trained with trainf_ocr_class_knntrainf_ocr_class_knnTrainfOcrClassKnntrainf_ocr_class_knnTrainfOcrClassKnnTrainfOcrClassKnn.

Parallelization

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Automatically parallelized on tuple level.

Parameters

Result

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

Possible Predecessors

trainf_ocr_class_knntrainf_ocr_class_knnTrainfOcrClassKnntrainf_ocr_class_knnTrainfOcrClassKnnTrainfOcrClassKnn, read_ocr_class_knnread_ocr_class_knnReadOcrClassKnnread_ocr_class_knnReadOcrClassKnnReadOcrClassKnn

Alternatives

do_ocr_single_class_knndo_ocr_single_class_knnDoOcrSingleClassKnndo_ocr_single_class_knnDoOcrSingleClassKnnDoOcrSingleClassKnn

See also

create_ocr_class_knncreate_ocr_class_knnCreateOcrClassKnncreate_ocr_class_knnCreateOcrClassKnnCreateOcrClassKnn, classify_class_knnclassify_class_knnClassifyClassKnnclassify_class_knnClassifyClassKnnClassifyClassKnn

Module

OCR/OCV