[Insight-users] LabelObject OCR with numbers

[Christian Werner]

  Ahhhh, now I get it... It's cleary rotated and so the Centroid shifts 
to the right/left. Of course!

Man, I lost hours on this '6' vs '9' and didn't see this... :) Just had 
this Centroid Y in mind, but this actually didn't work.

Thanks all for the quick help and best regards,
Christian


Am 27.09.2010 17:46, schrieb Gaëtan Lehmann:
>
> Le 27 sept. 10 à 17:37, Christian Werner a écrit :
>
>> Weird, weird, weird. This really worked! How can a Centroids 
>> X-position differ between two numbers that are _vertically_ mirrored?
>
> because they are not mirrored but rotated by 180° :-)
> I guess you should also see something of that kind on the Y axis BTW.
>
>>
>> Here is what I get:
>>
>> 0:  Size: 18 - Elongation: 1.44449 - Flatness: 1.44449 - Centroid: 
>> 5,7 - dif: 2
>> 1:  Size: 10 - Elongation: 3.65503 - Flatness: 3.65503 - Centroid: 
>> 20,7 - dif: 1
>> 2:  Size: 15 - Elongation: 2.06489 - Flatness: 2.06489 - Centroid: 
>> 35,7 - dif: 2
>> 3:  Size: 15 - Elongation: 1.86812 - Flatness: 1.86812 - Centroid: 
>> 50,7 - dif: 2
>> 4:  Size: 16 - Elongation: 1.63288 - Flatness: 1.63288 - Centroid: 
>> 65,7 - dif: 2
>> 5:  Size: 17 - Elongation: 1.7793 - Flatness: 1.7793 - Centroid: 81,7 
>> - dif: 2
>> 6:  Size: 19 - Elongation: 1.54404 - Flatness: 1.54404 - Centroid: 
>> 95,7 - dif: 1
>> 7:  Size: 12 - Elongation: 2.50164 - Flatness: 2.50164 - Centroid: 
>> 108,8 - dif: 1
>> 8:  Size: 19 - Elongation: 1.53748 - Flatness: 1.53748 - Centroid: 
>> 123,7 - dif: 2
>> 9:  Size: 19 - Elongation: 1.54404 - Flatness: 1.54404 - Centroid: 
>> 138,7 - dif: 2
>
> Note that Elongation and Flatness are the same in 2D - they differ 
> only in 3D (and more).
>
> Gaëtan
>
>>
>> ...but I don't get it. :) Anyway, thanks alot Sergio and Juan!
>>
>>
>> Best regards,
>> Christian
>>
>>
>> Am 27.09.2010 17:25, schrieb Juan Vidal:
>>>
>>> What about using Sergio's idea in a "per-number" basis?
>>>
>>> You could substract the x-positoin of the leftmost pixel of the 
>>> number to its CentroidX, and maybe that result will help you to 
>>> differenciate both numbers.
>>>
>>> Good luck!
>>>
>>>
>>>
>>> 2010/9/27 Christian Werner <christian.werner at rwth-aachen.de>
>>> Thanks for the response, but the CentroidX already changes with the 
>>> position of the number. So if I am analyzing a sequence of numbers 
>>> "146998" the CentroidX will be different than in the sequence 
>>> "6138549".
>>>
>>> This is really funny, who is responsible for that? Why use 9 symbols 
>>> to represent 10 digits? :)
>>>
>>>
>>>
>>> Am 27.09.2010 17:02, schrieb Sergio Vera:
>>>> Hello
>>>> Maybe it's a crazy/stupid/already tried idea but, what about adding 
>>>> CentroidX to the list of features? I would say that '6' should have 
>>>> the centroid more to the left and '9' more to the right...
>>>>
>>>> HTH
>>>>
>>>> Sergio
>>>>
>>>> On Mon, Sep 27, 2010 at 4:44 PM, Christian Werner 
>>>> <christian.werner at rwth-aachen.de> wrote:
>>>>  Hi!
>>>>
>>>> I am doing a nice little OCR for some numbers. See the attached 
>>>> image. I can identify each number as an object. When I look at each 
>>>> object's attributes, I see a fatal similarity between the number 
>>>> '6' and '9':
>>>>
>>>> 0: Size: 18 - Elongation: 1.44449 - Flatness: 1.44449 - CentroidY: 6
>>>> 1: Size: 10 - Elongation: 3.65503 - Flatness: 3.65503 - CentroidY: 6
>>>> 2: Size: 15 - Elongation: 2.06489 - Flatness: 2.06489 - CentroidY: 6
>>>> 3: Size: 15 - Elongation: 1.86812 - Flatness: 1.86812 - CentroidY: 6
>>>> 4: Size: 16 - Elongation: 1.63288 - Flatness: 1.63288 - CentroidY: 6
>>>> 5: Size: 17 - Elongation: 1.7793 - Flatness: 1.7793 - CentroidY: 6
>>>> 6: Size: 19 - Elongation: 1.54404 - Flatness: 1.54404 - CentroidY: 6
>>>> 7: Size: 12 - Elongation: 2.50164 - Flatness: 2.50164 - CentroidY: 7
>>>> 8: Size: 19 - Elongation: 1.53748 - Flatness: 1.53748 - CentroidY: 6
>>>> 9: Size: 19 - Elongation: 1.54404 - Flatness: 1.54404 - CentroidY: 6
>>>>
>>>> Which means, that I can't distinguish '6' from a '9'. Does anybody 
>>>> have any idea how I could do that?
>>>>
>>>> Best regards,
>>>> Christian
>>>>
>>>> _____________________________________
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>>>>
>>>>
>>>> -- 
>>>> Sergio Vera
>>>>
>>>>  Alma IT Systems
>>>>  C/ Vilana, 4B, 4º 1ª
>>>>  08022 Barcelona
>>>>  T. (+34) 932 380 592
>>>>  www.alma3d.com
>>>
>>>
>>> _____________________________________
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>>> Visit other Kitware open-source projects at
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>>> Kitware offers ITK Training Courses, for more information visit:
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>>> Please keep messages on-topic and check the ITK FAQ at:
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>>>
>>>
>>> -- 
>>> Juan Vidal Allende
>>
>> _____________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
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>>
>> Kitware offers ITK Training Courses, for more information visit:
>> http://www.kitware.com/products/protraining.html
>>
>> Please keep messages on-topic and check the ITK FAQ at:
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>