随着数字图像处理和计算机视觉技术的不断发展,保护和研究文化遗产的方法越来越多,文章研究了在花山岩画的数字化保护和研究中应用ORB(Oriented FAST and Rotated BRIEF)特征匹配以及尺度不变特征变换(Scale Invariant Feature Transfor...随着数字图像处理和计算机视觉技术的不断发展,保护和研究文化遗产的方法越来越多,文章研究了在花山岩画的数字化保护和研究中应用ORB(Oriented FAST and Rotated BRIEF)特征匹配以及尺度不变特征变换(Scale Invariant Feature Transform,SIFI)算法的可行性。文章通过ORB和SIFI特征匹配技术提取花山岩画图像的特征点,再通过图像特征点进行匹配,最后根据匹配结果对花山岩画进行分析和研究。实验结果表明,ORB和SIFI特征匹配能够高效准确地提取花山岩画的主要特征,并为数字化保护和研究提供了一种可行的途径。展开更多
Background:The vast majority of patients with cholangiocarcinoma(CC)have advanced disease at diagnosis and are candidates for palliative treatment only.The robustness of the randomized controlled trials regarding the ...Background:The vast majority of patients with cholangiocarcinoma(CC)have advanced disease at diagnosis and are candidates for palliative treatment only.The robustness of the randomized controlled trials regarding the treatment of CC are assessed.Methods:A systematic review of all randomized control trials(RCT)of treatments for both intra-and extrahepatic CC between 2010 and 2020 was performed.The survival-inferred fragility index(SIFI;the minimum number of reassignments of the best survivors between arms that would overturn the statistical outcomes)was calculated.In addition,the gain,or loss,in survival in RCTs was evaluated by the restricted mean survival time(RMST)difference.Finally,the level of spin i.e.,misrepresentation of study outcomes,was measured in inconclusive studies to assess distorted reporting strategies.Results:Out of 6,167 studies retrieved,11 could be retained for full text revision(7 with both intra-and extrahepatic CC,3 with peri-hilar CC,and 1 with peri-hilar or distal CC).Only 3 studies included resected patients(2 with both intra-and extrahepatic CC and 1 with peri-hilar or distal CC).Nine studies investigated systemic chemotherapy(including 3 after surgical resection),one study evaluated photodynamic therapy,and another investigated the use of an endoscopically inserted stent in the biliary tract.The median SIFI was−2[interquartile range(IQR):−6.25,−0.25]across all studies.Overall,the median RMST difference was 0.56 months(IQR:0.10,0.95).Finally,for inconclusive studies,the level of spin was high,moderate,and low in respectively 12.5%,25%,and 62.5% of the studies.Conclusions:RCTs of CC showed a low degree of robustness with a frequent proportion of associated spin.展开更多
文摘随着数字图像处理和计算机视觉技术的不断发展,保护和研究文化遗产的方法越来越多,文章研究了在花山岩画的数字化保护和研究中应用ORB(Oriented FAST and Rotated BRIEF)特征匹配以及尺度不变特征变换(Scale Invariant Feature Transform,SIFI)算法的可行性。文章通过ORB和SIFI特征匹配技术提取花山岩画图像的特征点,再通过图像特征点进行匹配,最后根据匹配结果对花山岩画进行分析和研究。实验结果表明,ORB和SIFI特征匹配能够高效准确地提取花山岩画的主要特征,并为数字化保护和研究提供了一种可行的途径。
文摘Background:The vast majority of patients with cholangiocarcinoma(CC)have advanced disease at diagnosis and are candidates for palliative treatment only.The robustness of the randomized controlled trials regarding the treatment of CC are assessed.Methods:A systematic review of all randomized control trials(RCT)of treatments for both intra-and extrahepatic CC between 2010 and 2020 was performed.The survival-inferred fragility index(SIFI;the minimum number of reassignments of the best survivors between arms that would overturn the statistical outcomes)was calculated.In addition,the gain,or loss,in survival in RCTs was evaluated by the restricted mean survival time(RMST)difference.Finally,the level of spin i.e.,misrepresentation of study outcomes,was measured in inconclusive studies to assess distorted reporting strategies.Results:Out of 6,167 studies retrieved,11 could be retained for full text revision(7 with both intra-and extrahepatic CC,3 with peri-hilar CC,and 1 with peri-hilar or distal CC).Only 3 studies included resected patients(2 with both intra-and extrahepatic CC and 1 with peri-hilar or distal CC).Nine studies investigated systemic chemotherapy(including 3 after surgical resection),one study evaluated photodynamic therapy,and another investigated the use of an endoscopically inserted stent in the biliary tract.The median SIFI was−2[interquartile range(IQR):−6.25,−0.25]across all studies.Overall,the median RMST difference was 0.56 months(IQR:0.10,0.95).Finally,for inconclusive studies,the level of spin was high,moderate,and low in respectively 12.5%,25%,and 62.5% of the studies.Conclusions:RCTs of CC showed a low degree of robustness with a frequent proportion of associated spin.
