Get picture wich in in the screen of the phone

HI, there s a horizontal scroll arrangement wich is largest than the screen of the phone with many pictures in it. So there are images with only one visible at a there a way to get the position of the arrangement ? I would like to know which image is in the visible frame of the phone, to display a text according to this image.

Where can i find some exempled of use or tuto please ?

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