Camera api or take a picture?

English: Hello I am working on a project in which I need to take a specific section of the photo but the problem is that as the photo is going to be taken by a person it may not be in the correct position and move the necessary section of the photo. I was thinking of making a mark on the camera as in the QR codes about the position the section should be in. The problem is that I don’t know how to do this. Does anyone have any ideas or any methods?

It is hard to offer any solution without knowing which technology you’re using. It looks like you’re creating a mobile app, and mobile apps can be specific for a platform or can use HTML or web technologies.

This forum is for web technologies.

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Your request would be clearer if you showed screenshots of your app, showing the right way and the wrong way the picture is shot.