What is Deep Fusion on the iPhone?

What is Deep Fusion on iOS 11? How does Apple Deep Fusion work? What is the Deep Fusion camera on iPhone?

iPhone 11 Pro cameras

Deep Fusion uses computational photography to combine several image captures into one high-fidelity photo. The resulting photos feature a higher level of detail, less noise, and improved textures.

Multiple exposures are taken of the same scene and analyzed by Apple's Bionic Neural Engine. Short and long exposures are combined and processed pixel-by-pixel to optimize detail, color tone, and luminosity. Apple called Deep Fusion "mad science" at the iPhone 11 keynote event.

Deep Fusion launched with iOS 13.2 on the iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max.