In this paper, spectral hole depth dependence on temperature below 10 K in Tm^3+ :YAG crystal is investigated in detail. A novel model is proposed to analyze the temperature dependence on the spectral hole. By using...In this paper, spectral hole depth dependence on temperature below 10 K in Tm^3+ :YAG crystal is investigated in detail. A novel model is proposed to analyze the temperature dependence on the spectral hole. By using the proposed model, we theoretically deduce the temperature dependence of spectral hole depth. The results are compared with experimental results and they are in good agreement. According to the theoretic results, the optimum temperature in experiment can be found.展开更多
Depth image based rendering (DIBR) is an effective approach for virtual view synthesis in free viewpoint television and 3D video.One of the important steps in DIBR is filling the holes caused by disoeclusion regions...Depth image based rendering (DIBR) is an effective approach for virtual view synthesis in free viewpoint television and 3D video.One of the important steps in DIBR is filling the holes caused by disoeclusion regions and wrong depth values.Most of the existing hole-filling methods work well in areas of low spatial activity but fail to obtain satisfactory results in high spatial activity regions.In this paper,we combine the depth based hole-filling and the adaptive recursive interpolation algorithm which is capable of handling edges passing through the missing areas.Accoring to the experimental results,we confirm that the depth based adaptive recursive interpolation algorithm can provide better rendering quality objectively and subjectively.展开更多
利用爆炸地震波信号的非平稳随机特性,对其进行Hilbert变换转换成复数信号,获得爆炸地震波信号瞬时频率和相位双参数。使用双参数匹配追踪(Matching Pursuits)算法分解爆炸地震波信号,有效提高了匹配追踪(MP)算法的扫描效率,降低算法复...利用爆炸地震波信号的非平稳随机特性,对其进行Hilbert变换转换成复数信号,获得爆炸地震波信号瞬时频率和相位双参数。使用双参数匹配追踪(Matching Pursuits)算法分解爆炸地震波信号,有效提高了匹配追踪(MP)算法的扫描效率,降低算法复杂度,较传统过完备匹配追踪算法运算速率明显提高;结合维格纳瑞利分布(Wigner Ville Distribution,WVD)分析了不同孔深的爆炸地震波时频特性,有效消除了WVD交叉干扰项的影响。分析结果表明:在一定深度范围内,孔深增加,爆炸地震波能量增大,但高频能量衰减更严重;当孔深超过一定深度时,爆炸地震波高频能量衰减趋于稳定。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 11004152)the Science Fund of Tianjin Education Commission (Grant Nos. 20090715 and 20110704)
文摘In this paper, spectral hole depth dependence on temperature below 10 K in Tm^3+ :YAG crystal is investigated in detail. A novel model is proposed to analyze the temperature dependence on the spectral hole. By using the proposed model, we theoretically deduce the temperature dependence of spectral hole depth. The results are compared with experimental results and they are in good agreement. According to the theoretic results, the optimum temperature in experiment can be found.
基金The MSIP(Ministry of Science,ICT & Future Planning),Korea,under the ITRC(Information Technology Research Center)support program(NIPA-2013-H0301-13-2006)supervised by the NIPA(National IT Industry Promotion Agency)
文摘Depth image based rendering (DIBR) is an effective approach for virtual view synthesis in free viewpoint television and 3D video.One of the important steps in DIBR is filling the holes caused by disoeclusion regions and wrong depth values.Most of the existing hole-filling methods work well in areas of low spatial activity but fail to obtain satisfactory results in high spatial activity regions.In this paper,we combine the depth based hole-filling and the adaptive recursive interpolation algorithm which is capable of handling edges passing through the missing areas.Accoring to the experimental results,we confirm that the depth based adaptive recursive interpolation algorithm can provide better rendering quality objectively and subjectively.
文摘利用爆炸地震波信号的非平稳随机特性,对其进行Hilbert变换转换成复数信号,获得爆炸地震波信号瞬时频率和相位双参数。使用双参数匹配追踪(Matching Pursuits)算法分解爆炸地震波信号,有效提高了匹配追踪(MP)算法的扫描效率,降低算法复杂度,较传统过完备匹配追踪算法运算速率明显提高;结合维格纳瑞利分布(Wigner Ville Distribution,WVD)分析了不同孔深的爆炸地震波时频特性,有效消除了WVD交叉干扰项的影响。分析结果表明:在一定深度范围内,孔深增加,爆炸地震波能量增大,但高频能量衰减更严重;当孔深超过一定深度时,爆炸地震波高频能量衰减趋于稳定。