Add info about multiple box file formats

Author: Shree

Making-Box-Files---4.0.md

@@ -1,2 +1,74 @@
-See
-https://tesseract-ocr.github.io/tessdoc/TrainingTesseract-4.00#creating-training-data for more details.
+## Box File formats for Tesseract 4.0.x and later
+
+Multiple formats of box files are accepted by Tesseract4 for LSTM training, though they are different from the one used by Tesseract 3.
+
+### text2image
+
+Character based box files generated by `text2image` using Unicode font files and training text.
+
+```
+I 114 4655 120 4691 0
+n 127 4655 150 4682 0
+f 152 4655 169 4692 0
+o 168 4654 193 4682 0
+r 197 4654 213 4681 0
+m 214 4654 250 4681 0
+a 255 4654 280 4681 0
+t 282 4654 295 4689 0
+i 298 4654 304 4690 0
+o 308 4654 333 4681 0
+n 337 4654 360 4681 0
+  360 4653 378 4691 0
+G 378 4653 413 4691 0
+r 418 4653 434 4680 0
+o 434 4653 459 4680 0
+u 463 4653 486 4679 0
+p 491 4643 515 4680 0
+s 517 4653 540 4680 0
+  540 4653 555 4690 0
+```
+
+### lstmbox
+
+Generated by `tesseract` using `lstmbox` config from image files - each char uses coordinates of its entire line. These can also be generated from line images and their transcription with the `Makefile` in `tesstrain` repo.
+
+```
+I 114 4640 1912 4692 0
+n 114 4640 1912 4692 0
+f 114 4640 1912 4692 0
+o 114 4640 1912 4692 0
+r 114 4640 1912 4692 0
+m 114 4640 1912 4692 0
+a 114 4640 1912 4692 0
+t 114 4640 1912 4692 0
+i 114 4640 1912 4692 0
+o 114 4640 1912 4692 0
+n 114 4640 1912 4692 0
+  114 4640 1912 4692 0
+G 114 4640 1912 4692 0
+r 114 4640 1912 4692 0
+o 114 4640 1912 4692 0
+u 114 4640 1912 4692 0
+p 114 4640 1912 4692 0
+s 114 4640 1912 4692 0
+  114 4640 1912 4692 0
+```
+
+### wordstrbox
+
+Generated by `tesseract` using `wordstrbox` config from image files - Uses Wordstr  text and bounding boxes for the whole line
+
+```
+WordStr 114 4640 1907 4692 0 #Information Groups for public OPTIONAL, jaundice Proterozoic Have LOCATION 
+	 1908 4640 1912 4692 0
+WordStr 112 4544 2015 4592 0 #mixed, Male By TEXT Cove... ¥ INSTABILITY About WERE Crimson THAT HOPKINS 
+	 2016 4544 2020 4592 0
+```
+	 
+### `makebox` doesn't work for Tesseract 4.0.x and later
+
+Please note that box files generated by `tesseract` using `makebox` config file are OK for Tesseract3 but not for Tesseract4 LSTM training.
+
+### More details
+
+See the section  on [creating training data](https://tesseract-ocr.github.io/tessdoc/TrainingTesseract-4.00#creating-training-data) for more details.