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In most cases it focusses on a circle or oval in the centre of the image (very much like the microprism ring in "analog" SLR cameras). If you want to focus on something that is not in the centre, point first with the object in the centre and fix the focussing while you compose your image as you want to have it.In a jumbled environment, focussing is done on the object closest to the camera (and within that foussing centre of the image).Most problems occur when you want to take a picture through a window, e.g. from the inside of a touring car.
Guessing here but maybe one system just looks at the file size of the image. When in focus there will be more detail and the number of bytes will peak.