Hello Adrian,
I can try. I'm using C# .Net, btw. Tesseract 4.1.1, which is the latest
for this. I do think my settings are very specific to my purpose, so it
may be of no benefit to you.
I tried several different settings and most of them didn't work. So, I
experimented.
Here are the things I tried. The things commented out with "//" are
things that I tried and didn't work for me. I'm trying to extract text from
messages of a specific font type from an image. The messages have
several lines of alphanumeric text.
Here is the code section where I did most of my experimenting:
* var page = _engine.Process(img, PageSegMode.Auto);
//var page = _engine.Process(img, PageSegMode.AutoOnly); // Performs okay,
but still no A or B //var page = _engine.Process(img,
PageSegMode.AutoOsd); // Performs okay, but still no A or B
//var page = _engine.Process(img, PageSegMode.RawLine); // terrible
performance //var page = _engine.Process(img,
PageSegMode.SingleColumn); //var page = _engine.Process(img,
PageSegMode.SparseText); //var page = _engine.Process(img,
PageSegMode.SingleBlockVertText); // terrible performance
_engine.SetVariable("tessedit_char_whitelist", "
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
//_engine.SetVariable("tessedit_char_whitelist", "AB");*
*string result = page.GetText();*
You can see from above that I settled on the following settings:
* var page = _engine.Process(img, PageSegMode.Auto);*
* _engine.SetVariable("tessedit_char_whitelist", "
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");*
* string result = page.GetText();*
The images I use are from screenshots. That might not help. Hope it
does!
Regards,
...John
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On Thu, Sep 1, 2022 at 1:02 AM Adrian Paul Ciobanita <
adrian.cioban...@gmail.com> wrote:
> Hey John,
>
> Are you able to share which parameters you tweaked to get better
> performance?
>
> Thank you
>
> On Thu, Sep 1, 2022, 08:13 John Alway <jal...@gmail.com> wrote:
>
>> Hello Zdenko,
>>
>> Thank you for the advice. I ended up being able to tweak the tesseract
>> parameters and was able to improve performance so that it was good enough
>> without having to train.
>>
>> And I do appreciate the hard work and cleverness that has gone into
>> creating and improving tesseract. It's a beautiful piece of work.
>>
>> Regards,
>> ...John
>>
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>>
>> On Wed, Aug 31, 2022 at 10:04 AM Zdenko Podobny <zde...@gmail.com> wrote:
>>
>>> Trained data from tesseract 5 are compatible with 4, so definitely I
>>> would suggest using the latest tesseract version for training - there was a
>>> lot of bug fixing and speed improvements.
>>>
>>> IMO tesseract training has never been easy. I always suggest focusing on
>>> image preprocessing rather than training.
>>> Following an easy looking training tutorial could also mean you are on
>>> the wrong path (=> you waste your time and it increases your frustration).
>>> For example:Tesseract 4 has 2 engines LSTM and legacy engine. In this
>>> particular video, for which engine is that training? For hints see[1]. Did
>>> you plan to train that engine or other one?
>>>
>>> [1]
>>> https://tesseract-ocr.github.io/tessdoc/tess5/TrainingTesseract-5.html#overview-of-training-process
>>>
>>> Zdenko
>>>
>>>
>>> st 31. 8. 2022 o 15:40 John Alway <jal...@gmail.com> napísal(a):
>>>
>>>> "First of all: if you follow any tutorial on internet - report the
>>>> problem to the author of the tutorial."
>>>> Next: use official documentation for training. I see there are a bunch
>>>> of folks just "generating content" - to gain an audience. Without insight
>>>> and therefore also without support, using old/outdated information..."
>>>>
>>>> People are trying to find a nice, easy tutorial to help them get
>>>> through the forest. I think that's the bottom line. Thanks for the
>>>> link.
>>>>
>>>> 'Tesseract 4 was released 29 Oct 2018. Almost 4 year ago! The recent
>>>> tesseract version is 5.2 and training process was also improved:
>>>> https://github.com/tesseract-ocr/tesstrain";
>>>>
>>>> I understand this, but I'm using C# .Net, and I don't think version 5
>>>> is available in C#. Unless I'm mistaken? There are costly packages, such
>>>> as IronOcr which uses tesseract 5, but there is no way I can take that
>>>> route.
>>>>
>>>> Regards,
>>>> ...John
>>>>
>>>>
>>>>
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>>>>
>>>> On Wed, Aug 31, 2022 at 3:27 AM Zdenko Podobny <zde...@gmail.com>
>>>> wrote:
>>>>
>>>>> First of all: if you follow any tutorial on internet - report the
>>>>> problem to the author of the tutorial.
>>>>> Next: use official documentation for training. I see there are a bunch
>>>>> of folks just "generating content" - to gain an audience. Without insight
>>>>> and therefore also without support, using old/outdated information...
>>>>> Tesseract 4 was released 29 Oct 2018. Almost 4 year ago! The recent
>>>>> tesseract version is 5.2 and training process was also improved:
>>>>> https://github.com/tesseract-ocr/tesstrain
>>>>>
>>>>> Zdenko
>>>>>
>>>>>
>>>>> st 31. 8. 2022 o 0:18 John Alway <jal...@gmail.com> napísal(a):
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I've been following a tutorial on youtube titled "Tesseract OCR -
>>>>>> Lesson 2: Training Tesseract for new font" here:
>>>>>> https://www.youtube.com/watch?v=1v8BPw0Dn0I&ab_channel=TheCode
>>>>>>
>>>>>> I'm using tesseract 4.0 on Window 10.
>>>>>>
>>>>>> I went through the steps he used, and everything seems to go smoothly
>>>>>> until I get to the actual training. When I run "mftraining" the
>>>>>> program
>>>>>> hangs. It seems to get stuck and doesn't indicate why are what it's
>>>>>> doing.
>>>>>>
>>>>>> I'm using a set of fonts in an image. I have the full alphabet upper
>>>>>> and lower case and the numbers 0 to 9 on the png image. I've attached
>>>>>> the
>>>>>> image. Unlike him, I'm using the English. I don't know the font, so I'm
>>>>>> just calling it tiktok to give it a name. My training file is called
>>>>>> *eng.tiktok.exp0.tr
>>>>>> <http://eng.tiktok.exp0.tr> *
>>>>>>
>>>>>> I used* jTessBoxEditor* to correct mistakes and set the box sizes
>>>>>> and positions precisely.
>>>>>>
>>>>>>
>>>>>> When I run this command:
>>>>>> *mftraining -F font_properties -U unicharset -O eng.unicharset
>>>>>> eng.tiktok.exp0.tr <http://eng.tiktok.exp0.tr>*
>>>>>>
>>>>>> The program just hangs. I've waited over twenty minutes.
>>>>>>
>>>>>> Should I wait longer? What could cause it to hang?
>>>>>>
>>>>>>
>>>>>>
>>>>>> Thanks!
>>>>>> ...John
>>>>>>
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