Different results generated from pyocr and tesseract

[eugene123tw]

I am getting different response using tesseract and pyocr,

tesseract c++ code:

vector<vector<int>> getWord(Pix *image){
    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    cout << "Get Words!" << endl;
    api->Init(NULL, "eng");
    api->SetImage(image);
    api->Recognize(0);
    
    vector<vector<int>> bbs;

    tesseract::ResultIterator* ri = api->GetIterator();
    tesseract::PageIteratorLevel level = tesseract::RIL_WORD;
    if (ri != 0) {
    do {
      const char* word = ri->GetUTF8Text(level);
      float conf = ri->Confidence(level);
      int x1, y1, x2, y2;
      ri->BoundingBox(level, &x1, &y1, &x2, &y2);
      printf("word: '%s';  \tconf: %.2f; BoundingBox: %d,%d,%d,%d;\n", word, conf, x1, y1, x2, y2);
      vector<int> bb = {x1,y1,x2,y2};
      bbs.push_back(bb);

      delete[] word;
    } while (ri->Next(level));
    }
    return bbs;
}

Result:

word: 'Teer';  	conf: 26.52; BoundingBox: 765,345,953,432;
word: 'ats';  	conf: 35.33; BoundingBox: 961,376,1155,432;
word: 'Kelly';  	conf: 96.62; BoundingBox: 665,569,900,706;
word: 'Crews';  	conf: 88.17; BoundingBox: 940,566,1256,694;

pyocr python code:

import cv2
from PIL import Image
import sys

import pyocr
import pyocr.builders


filename = "xxx.jpg"

tools = pyocr.get_available_tools()
if len(tools) == 0:
    print("No OCR tool found")
    sys.exit(1)
# The tools are returned in the recommended order of usage
tool = tools[0]
print("Will use tool '%s'" % (tool.get_name()))
# Ex: Will use tool 'libtesseract'

langs = tool.get_available_languages()
print("Available languages: %s" % ", ".join(langs))
lang = langs[0]
print("Will use lang '%s'" % (lang))

word_boxes = tool.image_to_string(
    Image.open(filename),
    lang="eng",
    builder=pyocr.builders.WordBoxBuilder()
)

for item in word_boxes:
    print(item)

Result:

Will use tool 'Tesseract (sh)'
Available languages: eng, osd
Will use lang 'eng'

Process finished with exit code 0

[jflesch]

1. Have you tried running tesseract from the command line directly ? Do you get the same result ?
2. You can try replacing tool.image_to_string() by pyocr.libtesseract.image_to_string(). You will probably get a result closer to your C++ program.