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Báo cáo hóa học: " Research Article Adaptive Resolution Upconversion for Compressed Video Using Pixel Classification"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Adaptive Resolution Upconversion for Compressed Video Using Pixel Classification | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 71432 6 pages doi 10.1155 2007 71432 Research Article Adaptive Resolution Upconversion for Compressed Video Using Pixel Classification Ling Shao Video Processing and Analysis Group Philips Research Laboratories High Tech Campus 36 5656 AE Eindhoven The Netherlands Received 22 August 2006 Accepted 3 May 2007 Recommended by Richard R. Schultz A novel adaptive resolution upconversion algorithm that is robust to compression artifacts is proposed. This method is based on classification of local image patterns using both structure information and activity measure to explicitly distinguish pixels into content or coding artifacts. The structure information is represented by adaptive dynamic-range coding and the activity measure is the combination of local entropy and dynamic range. For each pattern class the weighting coefficients of upscaling are optimized by a least-mean-square LMS training technique which trains on the combination of the original images and the compressed downsampled versions of the original images. Experimental results show that our proposed upconversion approach outperforms other classification-based upconversion and artifact reduction techniques in concatenation. Copyright 2007 Ling Shao. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION With the continuous demand of higher picture quality the resolution of high-end TV products is rapidly increasing. The resolution of broadcasting programs or video on storage discs is usually lower than that of high-definition HD TV. Therefore those video materials have to be upconverted to fit the resolution of the HDTV. Due to the bandwidth limit of the broadcasting channels and the capacity limit of the storage media the video materials .