Blocking effect removal using regularization and dithering

Abstract

This paper presents the generalized lapped biorthogonal transform embedded inverse discrete cosine transform (ge-IDCT) as an alternative to the IDCT. The ge-IDCT with the nonlinear weighting in embedded transform domain can reconstruct the signal with alleviated blockishenss. Additional complexity imposed by the replacement is trivial thanks to efficient lattice structure. The proposed ge-IDCT is applied in the JPEG still image compression standard to demonstrate its validity.