Deringing cartoons by image analogies
ACM Transactions on Graphics (TOG)
Adaptive fuzzy filtering for artifact reduction in compressed images and videos
IEEE Transactions on Image Processing
Hardware implementation of MPEG analysis and deblocking for video enhancement
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
No-Reference Estimation of the Coding PSNR for H.264-Coded Sequences
IEEE Transactions on Consumer Electronics
Deblocking of block-transform compressed images using weighted sums of symmetrically aligned pixels
IEEE Transactions on Image Processing
A deblocking filter with two separate modes in block-based video coding
IEEE Transactions on Circuits and Systems for Video Technology
A unified rate-distortion analysis framework for transform coding
IEEE Transactions on Circuits and Systems for Video Technology
Multiframe blocking-artifact reduction for transform-coded video
IEEE Transactions on Circuits and Systems for Video Technology
A unified approach to restoration, deinterlacing and resolution enhancement in decoding MPEG-2 video
IEEE Transactions on Circuits and Systems for Video Technology
Efficient DCT-domain blind measurement and reduction of blocking artifacts
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
Deblocking filter for low bit rate MPEG-4 video
IEEE Transactions on Circuits and Systems for Video Technology
A method of estimating coding PSNR using quantized DCT coefficients
IEEE Transactions on Circuits and Systems for Video Technology
Iterative procedures for reduction of blocking effects in transform image coding
IEEE Transactions on Circuits and Systems for Video Technology
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We propose no-reference analysis and processing of DCT (Discrete Cosine Transform) coded images based on estimation of selected MPEG parameters from the decoded video. The goal is to assess MPEG video quality and perform post-processing without access to neither the original stream nor the code stream. Solutions are presented for MPEG-2 video. A method to estimate the quantization parameters of DCT coded images and MPEG I-frames at the macro-block level is presented. The results of this analysis is used for deblocking and deringing artifact reduction and no-reference PSNR estimation without code stream access. An adaptive deringing method using texture classification is presented. On the test set, the quantization parameters in MPEG-2 I-frames are estimated with an overall accuracy of 99.9% and the PSNR is estimated with an overall average error of 0.3dB. The deringing and deblocking algorithms yield improvements of 0.3dB on the MPEG-2 decoded test sequences.