MODIFIED POINTWISE SHAPE-ADAPTIVE DCT FOR HIGH-QUALITY DEBLOCKING OF COMPRESSED IMAGES

Chandan Singh D. Rawat, Rohan K. Shambharkar, Sukadev Meher

Abstract


Blocking artifact is one of the most annoying artifacts in the image compression coding. In order to improve the quality of the reconstructed image several deblocking algorithms have been proposed. A high-quality modified image deblocking algorithm based on the shape-adaptive DCT (SA-DCT) is shown. The SA-DCT is a low-complexity transform which can be computed on a support of arbitrary shape. This transform has been adopted by the MPEG-4 standard and it is found implemented in modern video hardware. This approach has been used for the deblocking of block-DCT compressed images. In this paper we see modified pointwise SA-DCT method based on adaptive DCT threshold coefficient instead of constant DCT threshold coefficient used by the original pointwise SA-DCT method. Extensive simulation experiments attest the advanced performance of the proposed filtering method. The visual quality of the estimates is high, with sharp detail preservation, clean edges. Blocking artifacts are suppressed while salient image features are preserved.

Keywords


Anisotropic, DCT threshold coefficient. Deblocking, SA-DCT.

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