Summary of your issue

Using OCR on cyrillic text yields a empty string even with correct model and white list

Environment

OpenCVSharp 4.5.3.20211228

What did you do when you faced the problem?

• Verified that it works with english model on latin characters
• Tested the image from the example below in the console with the same model and got this result:
  "Дульный тормоз-компенсатор Зенит "ДТК-1" 762х39 и 5.45х59 для АК"
  

Example code:

var whiteList = "АаБбВвГгДдЕеЁёЖжЗзИиЙйКкЛлМмНнОоПпРрСсТтУуФфХхЦцЧчШшЩщЪъЫыЬьЭэЮюЯя";
var model = OCRTesseract.Create("models", "rus", whiteList, 3, 7);
string text = "";
model.Run(img, out text, out _, out _, out _, ComponentLevels.TextLine);
if (text == "") Console.WriteLine("Empty");