How to set rules for taking pictures?

Hello,

I am trying to impelement a mobile app which takes a picture a ticket and then OCR the numbers inside of this ticket. I am developing it as a desktop app. right now when the OCR works I will try to switch it to mobile. In order to OCR the image, I need to capture the image with the same dimensions. May be only the region between the equal signs should be captured. So is there a way to make restrictions to capture the desired output? Any ideas would be great.

Thanks in advance & Best Regards.

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