Error Correction Code for Images

Hello,

I wanted to ask about hamming code, in explanation he used (7,4) for redundant bits and total bits --7. Is that only an example or the standard size/formula? I have to do on 32x32 binary image. I am a bit confused here.

I need any other good method for ECC -- error correction code other than this hamming?

Thank you

have a great day!