A simple algorithm for removing blocking artifacts in block-transform coded images

Despite their widespread popularity, the Joint Photographers Expert Group (JPEG) and Motion Pictures Expert Group (MPEG) compression standards can lead to noticeable "blocking" artifacts-artificial rectangular discontinuities in the decoded image. Powerful postprocessing algorithms have been developed to remove blocking artifacts without destroying key image information. However, all but the simplest algorithms can be too complex for real-time applications such as video and still image decoding. We introduce a fast, easy-to-implement algorithm that removes blockiness by performing a simple nonlinear smoothing of pixels. This approach significantly improves visual quality and achieves subjective and objective (PSNR) gains that are competitive with the best deblocking algorithms reported in the literature at much reduced computational complexity.

[1]  John G. Apostolopoulos,et al.  Postprocessing for very low bit-rate video compression , 1999, IEEE Trans. Image Process..

[2]  Jiebo Luo,et al.  On the application of Gibbs random field in image processing: from segmentation to enhancement , 1995, J. Electronic Imaging.

[3]  D. Legall,et al.  MPEG : A video compression standard for multimedia applications , 1991 .

[4]  Gregory K. Wallace,et al.  The JPEG still picture compression standard , 1992 .

[5]  Nikolas P. Galatsanos,et al.  Projection-based spatially adaptive reconstruction of block-transform compressed images , 1995, IEEE Trans. Image Process..

[6]  Ramesh A. Gopinath,et al.  Wavelet-based post-processing of low bit rate transform coded images , 1994, Proceedings of 1st International Conference on Image Processing.

[7]  Jiebo Luo,et al.  Applications of Gibbs random field in image processing: from segmentation to enhancement , 1994, Other Conferences.

[8]  Jerry D. Gibson,et al.  Distributions of the Two-Dimensional DCT Coefficients for Images , 1983, IEEE Trans. Commun..

[9]  Michael T. Orchard,et al.  A deblocking algorithm for JPEG compressed images using overcomplete wavelet representations , 1997, IEEE Trans. Circuits Syst. Video Technol..

[10]  Nikil Jayant,et al.  Adaptive postprocessing algorithms for low bit rate video signals , 1995, IEEE Trans. Image Process..

[11]  Mark J. T. Smith,et al.  Enhancement of block transform coded images using residual spectra adaptive postfiltering , 1994, Proceedings of IEEE Data Compression Conference (DCC'94).

[12]  Didier Le Gall,et al.  MPEG: a video compression standard for multimedia applications , 1991, CACM.

[13]  Anil K. Jain.  Fundamentals of Digital Image Processing , 2018, Control of Color Imaging Systems.

[14]  Michael T. Orchard,et al.  Image coding based on mixture modeling of wavelet coefficients and a fast estimation-quantization framework , 1997, Proceedings DCC '97. Data Compression Conference.

[15]  Zixiang Xiong,et al.  A simple deblocking algorithm for JPEG compressed images using overcomplete wavelet representations , 1997, Proceedings of 1997 IEEE International Symposium on Circuits and Systems. Circuits and Systems in the Information Age ISCAS '97.