September 5th, 2006

  • evan

coded exposure photography

Coded Exposure Photography:
In a conventional single-exposure photograph, moving objects or moving cameras cause motion blur. The exposure time defines a temporal box
filter that smears the moving object across the image by convolution. This box filter destroys important high-frequency spatial details
so that deblurring via deconvolution becomes an ill-posed problem.

Rather than leaving the shutter open for the entire exposure duration, we ``flutter'' the camera's shutter open and closed during the
chosen exposure time with a binary pseudo-random sequence. The flutter changes the box filter to a broad-band filter that preserves
high-frequency spatial details in the blurred image and the corresponding deconvolution becomes a well-posed problem. We demonstrate that
manually-specified point spread functions are sufficient for several challenging cases of motion-blur removal including extremely large
motions, textured backgrounds and partial occluders.
[via Behdad]