|
|
Hi,
On Sun, 15 Oct 2006, Yili Zhao wrote:
> Recently, there was a thief case happpened in my university, and the
> observer system had recorded it. However, the thief's face was not clear
> in the recorded video.
> I want to know is it possible to restore the man's face in some degree
> (maybe restore to 100% is not possible)?
Contrary to TV shows, it is not possible to "restore" the face. It is a
simple law of Information Theory that by post-processing images, you
actually take information _out_ of the image, not put some in.
Having said that, there are a few methods to put some external belief into
the images, like smoothing (from experience you expect the face to be
non-noisy), and then sharpening again (from experience you know that a
face is not blurry). Alternatively, you could apply a band-pass filter or
despeckle the image.
But please understand that this method is prone to errors. It is actually
very easy to do some innocent operations on a face image, and come up with
a face resembling someone else.
It is much safer to rely on other clues like "where has the thief
entered?" or "did he evidently know something only few people know?". For
example, in a case I know of, the thief tried to hide from the camera, but
only few people knew there was one.
Hth,
Dscho
|
Locked
