Denoising Documentation

[Pedro Correia]

Hi there,

I've been studying tesseract for a while now, but I still haven't found any documentation on it's denoising process. Does anyone know where to find it ?

Thanks in advance.

[Quan Nguyen]

Probably there is none. Tesseract is an OCR engine. Images usually are preprocessed before sending them to the engine.

[Pedro Correia]

Seems to me that tesseract does quite a lot of denoising during the layou analysis, like in ccnontextdetect.cpp (thanks to ComputeNoiseDensity method) and in strokewidht.cpp (DetectAndRemoveNosie method).

However, the one thing that I still don't understand is the vigorous_noise_removal method (from textord/makerow.cpp). Seems like it is disabled by default, is that correct? If so, why is that? What does it stand for exactly?