Digital zoom

Digital zoom is a method of decreasing the precise angle of view of a digital photograph or video image. It is accomplished by cropping an image down to an area with the same aspect ratio as the original, and scaling the image up to the dimensions of the original. The camera's optics are not adjusted.

It is accomplished electronically, so no optical resolution is gained.
Digital zooming may be enhanced by computationally expensive algorithms which sometimes involves artificial intelligence.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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