Tesseract-ocr duration time calculation

[beein...@gmail.com]

Hi,

is there any way how could be calculated an image OCR duration time before the recognation itself will start? I would like to make some kind of time status bar showing how long will it take to process the image. I tried to find dependence between image size or volume but there is no any dependence in it. Maybe pixels calculation before the OCR start will get some result? 

[Tom Morris]

On Sunday, July 10, 2016 at 2:01:59 PM UTC-4, beein...@gmail.com wrote:

Hi,

is there any way how could be calculated an image OCR duration time before the recognation itself will start? I would like to make some kind of time status bar showing how long will it take to process the image. I tried to find dependence between image size or volume but there is no any dependence in it. Maybe pixels calculation before the OCR start will get some result? 

There's no such linear relation between number of pixels and computation time. Noisier images take longer to process, as do those with ambiguities which require extra processing to resolve.

Unfortunately, until you finish, you're not going to know how much processing is required -- and by then it's too late for a progress bar.

If you wanted to put some effort into it, perhaps you could sample a bunch of images with different characteristics and see what the processing time correlates to extract a model for the processing time, but I have my doubts.

Tess has an internal pipeline which should give more and more accurate estimates about how much work there is to do, but you'd need to dig into it a little bit to see whether you could leverage it for your purposes.

Tom

[Zdenko Podobný]

Have a look at Text Fairy app[1] video 0:22. Are you looking for something like that? If yes, source code is available at github[2].

rmtheis wrote short blog post about it too[3]...

[1] https://play.google.com/store/apps/details?id=com.renard.ocr

[2] https://github.com/renard314/textfairy

[3] https://rmtheis.wordpress.com/2014/12/17/receiving-ocr-progress-updates-when-using-tesseract-on-android/

Zdenko

On Sun, Jul 10, 2016 at 11:16 AM, <beein...@gmail.com> wrote:

Hi,

is there any way how could be calculated an image OCR duration time before the recognation itself will start? I would like to make some kind of time status bar showing how long will it take to process the image. I tried to find dependence between image size or volume but there is no any dependence in it. Maybe pixels calculation before the OCR start will get some result? 

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