library(Rtesseract)
f = system.file("images", "1990_p44.png", package = "Rtesseract")
api = tesseract(f)
conf = GetConfidences(api)
plot(api)
grep("3560", names(conf))
# Zoom in on the table at the bottom of the image.
# Note that the 320 and 100 are width and height, not right and top
SetRectangle(api, 1108, 849, 200, 100)
Recognize(api)
conf1 = GetConfidences(api)
plot(api)
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