On Wednesday, April 20, 2016 at 2:42:58 AM UTC-4, Jonas Pfannschmidt wrote:
>
> Hi,
>
> I'm trying to automate UI tests using OCR. The goal is to have a test
> script with lines like: "click_text('Reports')" and it automatically clicks
> on the button "Report".
>
> It works quite well ... sometimes. I've attached two sample screen
> captures. The text on 'works.png' gets recognized reasonably well,
> 'fails.png' returns only garbage. Both images have been created
> programmatically in the same way (capture screen, resize by factor 4,
> convert to greyscale). Does anybody know why one works and the other
> doesn't?
>
Well, for one thing, the image that works has a lot more dark text on it,
whereas the one that doesn't not only has less text, but some of the text
that it has is greyed out.
At the end of the day Tesseract is going to be working on a bitonal image,
since you've got a non-traditional application, I'd think you'd want to
control as much of the image preprocessing as possible to make sure it's
getting done in a way that's appropriate for your application, so rather
than converting to greyscale, you should threshold and convert all the way
down to bitonal.
Tom
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