do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnn (Operator)

Name

do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnn — Classify multiple characters with an CNN-based OCR classifier.

Signature

Description

do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnn computes the best class for each of the characters given by the regions CharacterCharacterCharacterCharacterCharactercharacter and the gray values ImageImageImageImageImageimage with the OCR classifier OCRHandleOCRHandleOCRHandleOCRHandleOCRHandleOCRHandle and returns the classes in ClassClassClassClassClassclassVal and the corresponding confidences (probabilities) of the classes in ConfidenceConfidenceConfidenceConfidenceConfidenceconfidence.

In contrast to do_ocr_single_class_cnndo_ocr_single_class_cnnDoOcrSingleClassCnndo_ocr_single_class_cnnDoOcrSingleClassCnnDoOcrSingleClassCnn, do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnn can classify multiple characters in one call, and therefore typically is faster than a loop that uses do_ocr_single_class_cnndo_ocr_single_class_cnnDoOcrSingleClassCnndo_ocr_single_class_cnnDoOcrSingleClassCnnDoOcrSingleClassCnn to classify single characters. However, do_ocr_multi_class_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnn can only return the best class of each character. Because the confidences can be interpreted as probabilities, it is easier to check whether a character has been classified with too much uncertainty. This is usually not a disadvantage, except in cases where the classes overlap so much that in many cases the second best class must be examined to be able to decide the class of the character. In these cases, do_ocr_single_class_cnndo_ocr_single_class_cnnDoOcrSingleClassCnndo_ocr_single_class_cnnDoOcrSingleClassCnnDoOcrSingleClassCnn should be used.

The result '\x1A'"\x1A""\x1A""\x1A""\x1A""\x1A" in ClassClassClassClassClassclassVal signifies that the region has been classified as rejection class.

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_cnndo_ocr_multi_class_cnnDoOcrMultiClassCnndo_ocr_multi_class_cnnDoOcrMultiClassCnnDoOcrMultiClassCnn returns the value 2 (H_MSG_TRUE). If necessary, an exception is raised.

Possible Predecessors

read_ocr_class_cnnread_ocr_class_cnnReadOcrClassCnnread_ocr_class_cnnReadOcrClassCnnReadOcrClassCnn

Alternatives

do_ocr_word_cnndo_ocr_word_cnnDoOcrWordCnndo_ocr_word_cnnDoOcrWordCnnDoOcrWordCnn, do_ocr_single_class_cnndo_ocr_single_class_cnnDoOcrSingleClassCnndo_ocr_single_class_cnnDoOcrSingleClassCnnDoOcrSingleClassCnn

Module

OCR/OCV