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How to do OCR for an Rotatioanl String

Problem in tarining OCR for Roational String  for eg. "HELLO WORLD"OCR_Test.jpg

 

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Palanivel Thiruvenkadam | பழனிவேல் திருவெங்கடம்
LabVIEW™ Champion |Certified LabVIEW™ Architect |Certified TestStand Developer

Kidlin's Law -If you can write the problem down clearly then the matter is half solved.
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Message 1 of 9
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Problem is in training step or detection step?

-I think in training step you can use rotated rectangle and select characters.

-In detection i don't see any way other than maybe using pattern match and get the text orientation and rotate image back to that and see.

-Did you try giving rotated rectangle as ROI descriptor during detection step and check? (I'm not sure if it works).

Thanks
uday
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Message 2 of 9
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Its not a problem unless and until you share what you are doing.

If you are manually teaching/training each character in LabVIEW then you can set the orientation for the search alphabet.

In past we had worked on rotated patterns and mirror patterns as well so I dont think this will resist you if you are using NI VISION VIs.

Please share what exactly you are doing this training.

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Message 3 of 9
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I am trying to teach via Vision Assistant but couldnt able to get the characters  being extracted to train single character.

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Palanivel Thiruvenkadam | பழனிவேல் திருவெங்கடம்
LabVIEW™ Champion |Certified LabVIEW™ Architect |Certified TestStand Developer

Kidlin's Law -If you can write the problem down clearly then the matter is half solved.
-----------------------------------------------------------------------------------------------------------------
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Message 4 of 9
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Looking like a bug or i might be missing something.

-Instead of training from Vision assistant try the ocr training interface separately.

-You can select the rotated rectangle and rotate and train.

-Where as when called in Vision assistant not able to use rotated rectangle.

Thanks
uday
Message 5 of 9
(4,322 Views)

Thanks udka,

I used NI OCR Training Interface and i can able to rotate the rectangular tool, can able to detect character and train.

Is there a way to set the ROI dynamically/ Programmatically based on the Rotated angle as used in training portion

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Palanivel Thiruvenkadam | பழனிவேல் திருவெங்கடம்
LabVIEW™ Champion |Certified LabVIEW™ Architect |Certified TestStand Developer

Kidlin's Law -If you can write the problem down clearly then the matter is half solved.
-----------------------------------------------------------------------------------------------------------------
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Message 6 of 9
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As i previously stated you might use pattern matching to get the orientation of text and then give the result ROI Descriptor of OCR Read Text VI.

Thanks
uday
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Message 7 of 9
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As I know about OCR you should have good pattern of Alphabets that you would like to teach.

Since you are teaching a rotated pattern and then struggling to set the rotated ROI programatically inspite of this you can teach a straight pattern and set the rotated angle within which you want to find the rotated alphabet.

 

Example:

Suppose I have an alphabet 'A'. I will teach 'A' as it is(without rotation) with a default ROI rectangle.Now during a search OCR operation I would put the same ROI rectangle by adding +/- rotation angle suppose 45 degree. This will give me a freedom of searching  a pattern 45 degree left and right rotated alphabet.

I hope this might help.

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Message 8 of 9
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Thanks for all your replies, i will try and get back if i face issue or if my issue gets resolved

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Palanivel Thiruvenkadam | பழனிவேல் திருவெங்கடம்
LabVIEW™ Champion |Certified LabVIEW™ Architect |Certified TestStand Developer

Kidlin's Law -If you can write the problem down clearly then the matter is half solved.
-----------------------------------------------------------------------------------------------------------------
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Message 9 of 9
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