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openalpr / openalpr

Automatic License Plate Recognition library
http://www.openalpr.com
GNU Affero General Public License v3.0
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detector missing characters #422

Closed ChillyGuy closed 7 years ago

ChillyGuy commented 7 years ago

Hello! Im working on training alpr for Iranian plates, theres a problem which is bugging me ever since i started my custom ocr traineddata against plates.

for some reason some characters are not detectable by the program and I'm clueless how to fix it. as an example in screen shot below plate on the right has 8 characters but ALPR detects only 7 funny thing is it has detected it correctly but for some reason demoted the result to the second place ... (correct result has confidence : 79.8315)

result

Plate example

debug.txt

Thanks in advance

matthill commented 7 years ago

That's because it didn't strongly match the first "9" character. It was more confident that it wasn't sure what it was:

Improving the quality of the OCR training set may help

PostProcess Line 0 Letter: 0 ۲ -- score: 137.066 -- occurrences: 6 PostProcess Line 0 Letter: 0 ۳ -- score: 9.24496 -- occurrences: 1 PostProcess Line 0 Letter: 0 ~ -- score: 5.75504 -- occurrences: 1 PostProcess Line 0 Letter: 1 ۲ -- score: 134.638 -- occurrences: 6 PostProcess Line 0 Letter: 2 و -- score: 73.7063 -- occurrences: 6 PostProcess Line 0 Letter: 2 ~ -- score: 33.014 -- occurrences: 5 PostProcess Line 0 Letter: 2 ۶ -- score: 1.49072 -- occurrences: 1 PostProcess Line 0 Letter: 3 ۵ -- score: 113.704 -- occurrences: 6 PostProcess Line 0 Letter: 4 ۳ -- score: 75.3051 -- occurrences: 6 PostProcess Line 0 Letter: 4 ~ -- score: 41.1455 -- occurrences: 10 PostProcess Line 0 Letter: 4 ۲ -- score: 28.5798 -- occurrences: 3 PostProcess Line 0 Letter: 4 ۴ -- score: 4.96964 -- occurrences: 1 PostProcess Line 0 Letter: 5 ~ -- score: 18.8806 -- occurrences: 2 PostProcess Line 0 Letter: 5 ۹ -- score: 11.1194 -- occurrences: 2 PostProcess Line 0 Letter: 6 ۹ -- score: 70.4581 -- occurrences: 6 PostProcess Line 0 Letter: 6 ~ -- score: 22.4862 -- occurrences: 4 PostProcess Line 0 Letter: 7 ۹ -- score: 62.8051 -- occurrences: 4 PostProcess Line 0 Letter: 7 ~ -- score: 4.51016 -- occurrences: 2

ChillyGuy commented 7 years ago

Hello Mat, Thanks for responding i'll try to improve ocr library.

debMan commented 6 years ago

Hello dear \@ChillyGuy , I m working on persian alpr , did u got any result , i need some help

ChillyGuy commented 6 years ago

Hey, Yep, it takes a bit time to get the hang of it but once you do you can get it to work.

zongoalbert commented 4 years ago

hello dear @ChillyGuy

I'm working on a project about recognizing moroccan license plates which look like this image : image i did not have datasets , i decide to use "us" and "eu" alpr i tried to modify "us.patterns" i added the line " mr #####@# "

When I run the command line " alpr -p mr lprmr.jpg" it give me this result :

plate0: 8 results