I am able to get word level confidence score using tesseract 4.0 through the command line. Interested to know if there is a way to get the character confidence too.
For word level confidence used the below command:
tesseract [Image name] outputbase --oem 1 -l eng --psm 8 tsv
Set hocr_char_boxes to 1 in your config file. Or, at the command line, your updated command would be:
tesseract [Image name] outputbase --oem 1 -l eng --psm 8 -c hocr_char_boxes=1 hocr
Note the hocr output option and look in that file for ..._wconf, e.g.
<span class='ocrx_word' id='word_1_1' title='bbox 127 344 4618 6915; x_wconf 1'>
Let me know if this works for you, otherwise I'll just delete the answer.
Source: https://github.com/tesseract-ocr/tesseract/issues/1465#issuecomment-513139976
来源：https://stackoverflow.com/questions/48162645/how-to-get-character-wise-confidence-in-tesseract-using-command-line