tesseract-ocrHow do I use the Tesseract OCR engine in different modes?

The Tesseract OCR engine can be used in three different modes:

1. Command Line Mode: This mode allows users to run Tesseract from the command prompt. An example command to run Tesseract is tesseract input.jpg output. This command will take the image file input.jpg and create a text file output.txt containing the OCR result.

2. C++ API Mode: This mode allows users to call Tesseract from their own C++ programs. An example of this is shown below:

#include <tesseract/baseapi.h>

tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
api->Init(NULL, "eng");
api->SetImage(imagedata);
api->Recognize(0);

tesseract::ResultIterator* ri = api->GetIterator();
if (ri != 0) {
    do {
        const char* word = ri->GetUTF8Text(tesseract::RIL_WORD);
        float conf = ri->Confidence(tesseract::RIL_WORD);
        printf("word: '%s';  \tconf: %.2f\n", word, conf);
        delete[] word;
    } while (ri->Next(tesseract::RIL_WORD));
}

api->End();

The code above will take an image as input, run Tesseract on it, and output each word found along with its confidence score.

3. Python API Mode: This mode allows users to call Tesseract from their own Python programs. An example of this is shown below:

import tesseract

api = tesseract.TessBaseAPI()
api.Init(".","eng",tesseract.OEM_DEFAULT)
api.SetImage(imagedata)
text=api.GetUTF8Text()
conf=api.MeanTextConf()

print("Text: " + text)
print("Confidence: " + str(conf))

The code above will take an image as input, run Tesseract on it, and output the text found along with its confidence score.

Helpful links

• Tesseract OCR
• Tesseract C++ API
• Tesseract Python API

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