针对传统SURF算法(speeded up robust features)在拼接高分辨率无人机航拍图像时运行速度慢、特征匹配率低的特点,提出了一种基于IB-SURF(image block-SURF)技术的无人机图像拼接算法。结合无人机定位定姿系统(position and orientation...针对传统SURF算法(speeded up robust features)在拼接高分辨率无人机航拍图像时运行速度慢、特征匹配率低的特点,提出了一种基于IB-SURF(image block-SURF)技术的无人机图像拼接算法。结合无人机定位定姿系统(position and orientation system,POS)求取图像重叠区域;构造掩模在无人机图像重叠区域检测特征点,减少特征提取时间;借助图像分块(image block,IB)的思想对图像划分网格,精简筛选特征点;引入Neighborhood-KNN(neighborhood-K nearest neighbors)进行特征点匹配,提高图像匹配效率。实验结果表明,IB-SURF算法有较快的运行速度和较高的特征匹配率,平均特征匹配率达到84.3%,特征匹配正确率超过95.1%,为图像高质量拼接提供了技术基础。展开更多
To examine the pragmatic value of the revised Well-Being scale (New Well-Being Scale, NWS) for evaluating treatment effects in leukemia patients. Methods: 54 leukemia patients were rated by the NWS before and after tr...To examine the pragmatic value of the revised Well-Being scale (New Well-Being Scale, NWS) for evaluating treatment effects in leukemia patients. Methods: 54 leukemia patients were rated by the NWS before and after treatment. Results: Regardless of sex and therapeutic duration, patients showed improvement in symptoms, mental state and social adaptability after treatment. Conclusion: The NWS constituted a useful assessment tool for monitoring treatment effects in Leuk regardless of sex and therapeutic period of leukemia patients.展开更多
文摘To examine the pragmatic value of the revised Well-Being scale (New Well-Being Scale, NWS) for evaluating treatment effects in leukemia patients. Methods: 54 leukemia patients were rated by the NWS before and after treatment. Results: Regardless of sex and therapeutic duration, patients showed improvement in symptoms, mental state and social adaptability after treatment. Conclusion: The NWS constituted a useful assessment tool for monitoring treatment effects in Leuk regardless of sex and therapeutic period of leukemia patients.