Summary: Invertible Motion Blur in Video
Mitsubishi Electric Research Labs (MERL), Cambridge, MA
MIT Media Lab, Cambridge, MA
Captured Photos Deblurred Result Motion Streaks
Figure 1: By simply varying the exposure time for video frames, multi-image deblurring can be made invertible. (Left) Varying exposure
photos of a moving car. Notice the change in illumination and the blur size in the captured photos. (Right) The foreground object is
automatically rectified, segmented, deblurred, and composed onto the background using the varying exposure video. Novel renderings, such
as motion streaks, can be generated by linear combination of the deblurred image and the captured photos.
We show that motion blur in successive video frames is invertible
even if the point-spread function (PSF) due to motion smear in a
single photo is non-invertible. Blurred photos exhibit nulls in the
frequency transform of the PSF, leading to an ill-posed deconvolu-
tion. Hardware solutions to avoid this require specialized devices
such as the coded exposure camera or accelerating sensor motion.
We employ ordinary video cameras and introduce the notion of
null-filling along with joint-invertibility of multiple blur-functions.