The present invention relates to a method for recovering a compressed
image for an image processing technique and an apparatus therefor. In the
present invention, a cost function is defined in consideration with a
directional characteristic of the pixels which will be recovered and a
plurality of pixels of the recovering pixels. In addition, a
regularization parameter variable having a certain weight is obtained
from the cost function, and the regularization parameter variable is
approximated using the compressed pixel for thereby obtaining a
recovering pixel. The regularization parameter variable has a weight of a
reliability with respect to the original image and a weight of a
smoothing degree of the original image. In the methods and apparatuses
for recovering a compressed motion picture a cost function is defined in
consideration with a directional characteristic of the pixels which will
be recovered and a plurality of pixels of the recovering pixels. In
addition, a regularization parameter variable having a certain weight is
obtained from the cost function, and the regularization parameter
variable is approximated using the compressed pixel for thereby obtaining
a recovering pixel. In the methods and apparatuses for filtering, a
filtering method is selected from filtering methods having different
filtering strengths based on whether a pixel being filleted is in an
intra-coded portion of an image.