tess4j 设置只识别数字和字母

Question

我想设置tess4j 只识别数字和字母

Tesseract instance = new Tesseract();
instance.setDatapath("C:\\Users\\qyw\\Desktop\\tessdata");
String s = instance.doOCR(img);
System.out.println(s);

Answer 1

instance.setTessVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyz");

见doc。