| 新的H．264降尺寸转码快速算法 |
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| 引用本文： | 吕卓逸,贾克斌.新的H．264降尺寸转码快速算法[J].北京工业大学学报,2011,37(12):1786-1792. |
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| 作者姓名： | 吕卓逸 贾克斌 |
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| 作者单位： | 北京工业大学电子信息与控制工程学院,北京,100124;北京工业大学电子信息与控制工程学院,北京,100124 |
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| 基金项目： | 国家自然科学基金资助项目(60672050);北京市自然科学基金资助项目(4062005) |
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| 摘 要： | 结合图像纹理特征和宏块运动特性,提出一种新的H.264降尺寸转码算法,充分利用输入编码码流中的编码信息来提高转码效率.通过运动边缘检测划分出运动区域与背景区域,针对不同区域内的宏块,基于其运动特性,采取不同的帧间模式选择策略.提出一种基于感兴趣区域的运动矢量合成和修正算法.利用运动矢量方差判断宏块运动的多样性,基于宏块的多样性和重要性自适应地合成和修正运动矢量.实验证明,此算法具有较强的鲁棒性和广泛的适用性,在转码后的视频质量和转码速度方面都取得了很好的效果.
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| 关 键 词： | H．264降尺寸转码 帧间模式选择 运动矢量 |
Novel Algorithm of Fast Video-downsizing Transcoding of H.264 |
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| Affiliation: | Lü Zhuo-yi,JIA Ke-bin(School of Electronic Information & Control Engineering,Beijing University of Technology,Beijing 100124,China) |
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| Abstract: | A novel fast variable block size selection method for an inter-MB in a video-downsizing transcoder for H.264 is proposed,which uses the spatial homogeneity based on moving edge detection and temporal stationary characteristics by measuring activity magnitude.Based on the homogeneity and stationary of macro-blocks,only a few inter-modes are operated with the RDO process.In addition,adaptive motion vector re-construction and refinement scheme are proposed based on region of interest(ROI),besides of using variance and DCT coefficient for the definition of diversity and importance,respectively.Experimental results show that the new method is more robust and achieves good performance in both quality and complexity. |
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| Keywords: | video down-sizing transcoder inter mode decision region of interest motion vector re-construction motion vector refinement |
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