If you have an iPhone, iPad, or iPhone iPod touch:
It's not easy to get the book completely squared up. So sometimes the book looks less rectangular than it is in reality.
How to scan documents on your iPhone, iPad, or iPod touch
Open Notes and select a note or create a new one.
Tap the Camera button , then tap Scan Documents .
Place your document in view of the camera.
If your device is in Auto mode, your document will automatically scan. ...
Tap Save or add additional scans to the document.
For example: