How to clearly recognize text from captcha?

Question

Python

There is such a captcha
you need to recognize the text with the condition. Raw Tesseract doesn't work, tried converting to B/W like this:

thresh = 35
            fn = lambda x: 255 if x > thresh else 0
            bw = primer.convert('L').point(fn, mode='1')

Better, but still very crooked, dabbled with the parameters of this code - to no avail.
I tried to drive RGB colors into the script so that everything except certain colors is deleted, but in each captcha each color changes its hue.
How can I implement reading text from such a captcha?

Answer 1

Here is the neuron.
Only this particular network is trained in Chinese (I won’t even show how she read it). It's more of a proof of work.
Answer: CTPN for detecting words in a picture; CRNN for word recognition.
Relearn Russian and you will be happy.