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New blocking artifacts Reduction Method Based on Wavelet Transform

Semiconductor Photonics and Technology 2007年第1期13卷 43-47页

作者： SHI Min YI Qing-ming Department of Electronic Engineering Jinan University Guangzhou 510632 CHN

It is well known that a block discrete cosine transform compressed image exhibits visually annoying blocking artifacts at low-bit-rate. A new post-processing deblocking algorithm in wavelet domain is proposed. The algorithm exploits blocking-artifact features shown in wavelet domain. The energy of blocking artifacts is concentrated into some lines to form annoying visual effects after wavelet transform. The aim of reducing blocking artifacts is to capture excessive energy on the block boundary effectively and reduce it below the visual scope. Adaptive operators for different subbands are computed based on the wavelet coefficients. The operators are made adaptive to different images and characteristics of blocking artifacts. Experimental results show that the proposed method can significantly improve the visual quality and also increase the peak signal-noise-ratio(PSNR) in the output image.

关键词： block discrete cosine transform(BDCT) blocking artifacts wavelet transform

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维普期刊数据库

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An adaptive fuzzy filter for coding artifacts removal in video and image

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第6期8卷 841-848页

作者： WU Jing YE Xiu-qing GU Wei-kang Department of Information and Communication Engineering Zhejiang University Hangzhou 310027 China

This paper proposes a new adaptive post-filtering algorithm to remove coding artifacts in block-based video coder. The proposed method concentrates on blocking and ringing artifacts removal. For de-blocking, the blocking strength is identified to determine the filtering range, and the maximum quantization parameter of the image is used to adapt the 1D fuzzy filter. For de-ringing, besides the edge detection, a complementary ringing detection method is proposed to locate the neglected ringing blocks, and the gradient threshold is adopted to adjust the parameter of 2D fuzzy filter. Experiments are performed on the MPEG-4 sequences. Compared with other methods, the proposed one achieves better detail preservation and artifacts removal performance with lower computational cost.

关键词： Adaptive fuzzy filter blocking artifacts Ringing artifacts De-blocking De-ringing

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维普期刊数据库

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Fuzzy Based Adaptive Deblocking Filters at Low-Bitrate HEVC Videos for Communication Networks

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Computers, Materials & Continua 2021年第3期66卷 3045-3063页

作者： Anudeep Gandam Jagroop Singh Sidhu Department of Electronics and Communication Engineering IKG-Punjab Technical UniversityJalandhar144603India Department of Electronics and Communication Engineering DAVIETJalandharIndia

In-loop filtering significantly helps detect and remove blocking artifacts across block boundaries in low bitrate coded High Efficiency Video Coding(HEVC)frames and improves its subjective visual quality in multimedia services over communication ***,on faster processing of the complex videos at a low bitrate,some visible artifacts considerably degrade the picture *** this paper,we proposed a four-step fuzzy based adaptive deblocking filter selection *** proposed method removes the quantization noise,blocking artifacts and corner outliers efficiently for HEVC coded videos even at low *** have considered Y(luma),U(chromablue),and V(chroma-red)components ***,we have developed a fuzzy system to detect blocking artifacts and use adaptive filters as per requirement in all four quadrants,namely up 45◦,down 45◦,up 135◦,and down 135◦across horizontal and vertical block *** this context,experimentation is done on a wide variety of *** objective and subjective analysis is carried out with MATLAB software and Human Visual System(HVS).The proposed method substantially outperforms existing postprocessing deblocking techniques in terms of YPSNR and BD_*** the proposed method,we achieved 0.32–0.97 dB values of *** method achieved a BD_rate of+1.69%for the luma component,−0.18%(U)and−1.99%(V)for chroma components,respectively,with respect to the stateof-the-art *** proposed method proves to have low computational complexity and has better parallel processing,hence suitable for a real-time system in the near future.

关键词： Adaptive deblocking filters high efficiency video coding blocking artifacts corner outliers bitrate YPSNR BD_rate

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Elimination of Gibbs Phenomenon for Image Fusion in Tetrolet Transform Domain 36

Elimination of Gibbs Phenomenon for Image Fusion in Tetrolet...

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第36届中国控制会议

作者： De-xiang Zhang Jing-zhong Kang Bao-hong Yuan Kai-feng Liu School of Electrical Engineering and Automation of Anhui University School of Electronic and Electrical Engineering of Anhui Sanlian University

ISBN: (纸本)9781538629185

In order to get an efficient image multi-scale geometrical representation,the basic principle of tetrolet transform is *** are Haar-type wavelets whose supports are tetrominoes which are shapes made by connecting four equal-sized *** transform is divide the image into 4×4 blocks in the horizontal and vertical direction,there is no overlap between the *** there is no overlap between the images blocks,so the image decomposition coefficients in image fusion processing is easy produce Gibbs *** order to reduce the blocking artifacts resulted from tetrolet transform algorithm in image *** efficient stationary tetrolet transform algorithm based on Haar wavelet transform is *** block overlaps method in image decomposition process is introduced in tetrolet *** new overlap block is inserted into the middle of the original *** results show that compared with tetrolet transform algorithm for image fusion,the proposed algorithm can get better sparse representation and eliminate the blocking artifacts in image fusion resulted from tetrolet transform algorithm.

关键词： Stationary tetrolet transform Gibbs phenomenon image fusion blocking artifacts

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Novel Efficient De-blocking Method for Highly Compressed Images

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Semiconductor Photonics and Technology 2007年第2期13卷 122-125,145页

作者： SHI Min YI Qing-ming YANG Liang Department of Electronic Engineering Jinan University Guangzhou 510632 CHN

Due to coarse quantization, block-based discrete cosine transform(BDCT) compression methods usually suffer from visible blocking artifacts at the block boundaries. A novel efficient de-blocking method in DCT domain is proposed. A specific criterion for edge detection is given, one-dimensional DCT is applied on each row of the adjacent blocks and the shifted block in smooth region, and the transform coefficients of the shifted block are modified by weighting the average of three coefficients of the block. Mean square difference of slope criterion is used to judge the efficiency of the proposed algorithm. Simulation results show that the new method not only obtains satisfactory image quality, but also maintains high frequency information.

关键词： block-based discrete cosine transform(BDCT) blocking artifacts image compression

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