Binarization for very dark image

Question

I have many very dark images, I want to binarize these images, I used partial Ostu, but the result is terrible.

This is the image of night plate

and after partial Ostu, the result

So there are solutions to solve my problems?

Answer 1

What you ask is virtually impossible. Too low SNR and uneven illumination (or dirt).

I tried different denoising approaches, adaptive thresholding, combined with equalization or not, to no avail.

Barely readable, even for humans.