Evaluate two-pass Tesseract 4 with thresholding

output-ocr4-twopass.00.accuracy-results-hires

...ut-ocr4-twopass.00.accuracy-results-hires.difficult-pages

output-ocr4-twopass.00.accuracy-results-human

output-ocr4-twopass.00.accuracy-results-lowres

...t-ocr4-twopass.00.accuracy-results-lowres.difficult-pages

output-ocr4-twopass.100.accuracy-results-hires

...t-ocr4-twopass.100.accuracy-results-hires.difficult-pages

output-ocr4-twopass.100.accuracy-results-lowres

...-ocr4-twopass.100.accuracy-results-lowres.difficult-pages

output-ocr4-twopass.25.accuracy-results-hires

...ut-ocr4-twopass.25.accuracy-results-hires.difficult-pages

output-ocr4-twopass.25.accuracy-results-lowres

...t-ocr4-twopass.25.accuracy-results-lowres.difficult-pages

output-ocr4-twopass.50.accuracy-results-hires

...ut-ocr4-twopass.50.accuracy-results-hires.difficult-pages

output-ocr4-twopass.50.accuracy-results-lowres

...t-ocr4-twopass.50.accuracy-results-lowres.difficult-pages

output-ocr4-twopass.75.accuracy-results-hires

...ut-ocr4-twopass.75.accuracy-results-hires.difficult-pages

output-ocr4-twopass.75.accuracy-results-lowres