A rolling shutter is a method of image capture that captures images scanline by scanline. Consecutive scanlines are captured at slightly different times. If fast relative movement exists between the camera and the world, e.g., during the capture of a fast-moving propeller, the captured scene is distorted. In particular, straight lines may look curved or tilted, since different segments of the straight line are captured at different moments of time. In some situations, a front-facing camera captures images of relatively static faces in the foreground of the image, even as the background experiences high velocity, e.g., due to camera panning. In this case, traditional rolling shutter correction with a virtual global shutter causes foreground distortion. This disclosure describes techniques to correct rolling-shutter distortions in the background of an image while preserving the relatively distortion-free image foreground.

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