Reduction of blocking artifacts in JPEG compressed images
Digital Signal Processing
Fast Blind Measurement of Blocking Artifacts in both Pixel and DCT Domains
Journal of Mathematical Imaging and Vision
Design a deblocking filter with three separate modes in DCT-based coding
Journal of Visual Communication and Image Representation
JPEG Artifact Removal Using Error Distributions of Linear Coefficient Estimates
ICIAR '08 Proceedings of the 5th international conference on Image Analysis and Recognition
A perceptually relevant no-reference blockiness metric based on local image characteristics
EURASIP Journal on Advances in Signal Processing
Short Communication: Efficient quadtree based block-shift filtering for deblocking and deringing
Journal of Visual Communication and Image Representation
Reconstructing videos from multiple compressed copies
IEEE Transactions on Circuits and Systems for Video Technology
Digital image source coder forensics via intrinsic fingerprints
IEEE Transactions on Information Forensics and Security
Adaptive fuzzy filtering for artifact reduction in compressed images and videos
IEEE Transactions on Image Processing
An Efficient Upsampling Technique for Images and Videos
PCM '09 Proceedings of the 10th Pacific Rim Conference on Multimedia: Advances in Multimedia Information Processing
A framework for end-to-end video quality prediction of MPEG video
Journal of Visual Communication and Image Representation
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Blocking effect reduction in low bitrate video on a mobile platform
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Perceptual-based quality assessment for audio-visual services: A survey
Image Communication
A system to help digital video subjective evaluation
WebMedia '09 Proceedings of the XV Brazilian Symposium on Multimedia and the Web
JPEG error analysis and its applications to digital image forensics
IEEE Transactions on Information Forensics and Security
Image postprocessing by Non-local Kuan's filter
Journal of Visual Communication and Image Representation
No-reference analysis of decoded MPEG images for PSNR estimation and post-processing
Journal of Visual Communication and Image Representation
Video enhancement from multiple compressed copies in transform domain
Journal on Image and Video Processing - Special issue on emerging methods for color image and video quality enhancement
Learning-based image restoration for compressed images
Image Communication
An efficient adaptive de-blocking algorithm
CIS'05 Proceedings of the 2005 international conference on Computational Intelligence and Security - Volume Part II
Implementation and Optimization of an Enhanced PWD Metric for H.264/AVC on a TMS320C64 DSP
Journal of Signal Processing Systems
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Blocking artifacts continue to be among the most serious defects that occur in images and video streams compressed to low bit rates using block discrete cosine transform (DCT)-based compression standards (e.g., JPEG, MPEG, and H.263). It is of interest to be able to numerically assess the degree of blocking artifact in a visual signal, for example, in order to objectively determine the efficacy of a compression method, or to discover the quality of video content being delivered by a web server. We propose new methods for efficiently assessing, and subsequently reducing, the severity of blocking artifacts in compressed image bitstreams. The method is blind, and operates only in the DCT domain. Hence, it can be applied to unknown visual signals, and it is efficient since the signal need not be compressed or decompressed. In the algorithm, blocking artifacts are modeled as 2-D step functions. A fast DCT-domain algorithm extracts all parameters needed to detect the presence of, and estimate the amplitude of blocking artifacts, by exploiting several properties of the human vision system. Using the estimate of blockiness, a novel DCT-domain method is then developed which adaptively reduces detected blocking artifacts. Our experimental results show that the proposed method of measuring blocking artifacts is effective and stable across a wide variety of images. Moreover, the proposed blocking-artifact reduction method exhibits satisfactory performance as compared to other post-processing techniques. The proposed technique has a low computational cost hence can be used for real-time image/video quality monitoring and control, especially in applications where it is desired that the image/video data be processed directly in the DCT-domain.