Picture quality improvement in MPEG-4 video coding using simple adaptive filter
Proceedings of the 12th annual ACM international conference on Multimedia
Deringing cartoons by image analogies
ACM Transactions on Graphics (TOG)
Reduction of blocking artifacts in JPEG compressed images
Digital Signal Processing
Combined frequency and spatial domain algorithm for the removal of blocking artifacts
EURASIP Journal on Applied Signal Processing
Reduction of blocking artifacts in block-based compressed images
ACIVS'05 Proceedings of the 7th international conference on Advanced Concepts for Intelligent Vision Systems
PCM'04 Proceedings of the 5th Pacific Rim conference on Advances in Multimedia Information Processing - Volume Part III
Application of feedforward neural network for the deblocking of low bit rate coded images
AIS'04 Proceedings of the 13th international conference on AI, Simulation, and Planning in High Autonomy Systems
Hybrid deblocking algorithm for block-based low bit rate coded images
PCM'05 Proceedings of the 6th Pacific-Rim conference on Advances in Multimedia Information Processing - Volume Part I
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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We propose a discrete cosine transform (DCT)-based post-processing technique to alleviate the blocking artifacts in transform coded images. In our approach, the high-frequency components, mainly caused by the edge components, are examined through two steps. First, two adjacent homogeneous blocks from the block boundary are found, where the homogeneous block is defined as the block in which no adjacent pixels' difference is larger than the difference of the block boundary. Second, the local frequency characteristics in the homogeneous block are examined through the DCT. Then, we derive the relation between the DCT coefficients of two homogeneous blocks of different sizes. By considering the information about the original edge and the relation, we can detect the high-frequency components, mainly caused by the blocking artifact. The performance of the proposed technique is evaluated on both still and moving images. The simulation results indicate that the proposed technique reduces the blocking artifacts effectively and preserves the original edges faithfully, and its performance is very robust to the degree of degradation in the decoded images