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is it possible to share the images that did not work for you?

We are majorly facing challenge with cheques and bank statements with noisy background. e.g. those of HDFC bank.

Out of interest, with cheques are you facing problems with sort code etc too, if so, I was just wondering, don't they use magnetic ink for those.

No, magnetic ink is only used at the bottom of the cheque for banking systems to identify the source of cheque.