Reducing artifacts from compressed digital images

      Young Kyoo Hwang
      Jung-Jin Park

Abstract

In this project, we present a new image recovery algorithm to remove, in
addition to blocking, ringing artifacts from compressed images and
video.  This new algorithm is based on the theory of projections onto
convex sets.  A new family of directional smoothness constraint sets is
defined based on line processes modeling of the image edge structure. 
The definition of these smoothness sets also takes into account the fact
that the visibility of compression artifacts in an image is spatially
varying.  The projection will be taken on 0, 45, -45 and 90 degree.  The
artifacts will be reduced from this projection algorithm

Actually, the project was used by a student for his project for last
year.  We don=92t think he had finished this project well because there
was no big difference of the image quality after the process compare to
the original image.  We will show a great improvement of the previous
project.  Also, we will show improvement of this algorithm.