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Block-Based Detection Systems for Visual Artifact Location
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DOI：10.1109/TCE.2013.6531120.png)
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摘要
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The core of many video coding standards is formed by the Discrete Cosine Transform (DCT) for de-correlating spatial video data. When quantizing DCT coefficients, artifacts may appear such as mosquito noise and ringing. Spatial artifact reduction requires artifact-location information, to control the filter process, thereby avoiding unnecessary blurring of non-visual artifact-contaminated regions. This location information can be derived either in the spatial or frequency domain. In this paper, we will present two systems: one for each domain. As coding artifacts are most annoying in flat or low-frequency regions, the objective of the detector is to localize these artifact-sensitive locations. The detection accuracy, coverage and sensitivity differ between the two different detection systems. Experiments have revealed that the spatial-domain system has a better performance on edge tracking and detection of small-sized flat region. However, the system degrades in separating originally present low-amplitude texture from artifact contamination, compared to the same capability of the frequency-domain system(1).
Keyword:
Compression
DCT
Graphics
Locator information
Mosquito noise
Ringing
期刊
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10.9
论文数:
5.3K
被引数:
6.8K
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