Title :
A new approach for reducing blockiness in DCT image coders
Author :
Martucci, Stephen A.
Author_Institution :
Scitex Digital Video, Grass Valley, CA, USA
Abstract :
This paper presents a new approach for reducing the blockiness that occurs when using DCT image coders at high compression ratios. The method is simply the replacement of the inverse DCT-2 in the decoder by a larger inverse DCT-1 followed by overlapping and averaging of the enlarged blocks to reconstruct the image. The modified decoder can decode any bitstream generated by a standard encoder. Blockiness is reduced but there is no noticeable distortion or loss of sharpness in the image. There is also no significant increase in complexity when using this method
Keywords :
data compression; decoding; discrete cosine transforms; image coding; transform coding; DCT image coders; averaging; bitstream; blockiness reduction; high compression ratios; image reconstruction; inverse DCT-1; modified decoder; overlapping; Decoding; Discrete cosine transforms; Entropy; Filtering; Filters; Image coding; Image reconstruction; Quantization; Transform coding; Video compression;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.678042
