[FIXED] PyTesseract not seeing some single-digit numbers in table

Issue

I have this image of a table

I'm trying to parse it using PyTesseract. I've gotten pretty darn close using this code:

from PIL import Image, ImageOps
import pytesseract

og_image = Image.open('og_image.png')
grayscale = ImageOps.grayscale(og_image)
inverted = ImageOps.invert(grayscale.convert('RGB'))
print(pytesseract.image_to_string(inverted))

This seems to be very accurate, except the single-digit numbers in the second-to-last column are blank. Do I need to do something different to pick up on those numbers?

Solution

Tesseract has several modes of page segmentation, and choosing the right one is necessary to help it getting best result. See documentation.

Also in this case, you can restrict tesseract to a certain character set.

Another thing, tesseract is sensitive to the fonts and image size. A simple resizing can change the results greatly. Here I change image size horizontally by factor 2 and vertically to get best result ;)

Combining all the above, you will get:

custom_config = r'--psm 6  -c tessedit_char_whitelist=0123456789.'
print(pytesseract.image_to_string(inverted.resize((1506, 412), Image.ANTIALIAS), config=custom_config))
      
1525 .199 303 82 161 162 7 .241
1464 .290 424 70 139 198 25 .352
1456 .292 425 116 224 224 0 .345
1433 .240 346 81 130 187 15 .275
1390 .273 373 108 217 216 3 .345
1386 .276 383 54 181 154 18 .315
1225 .208 255 68 148 129 1 .242
1218 .238 230 46 128 127 18 .273
1117 .240 268 43 113 1193 1 .308

Answered By - igrinis