二尖瓣的复杂结构和不规则运动特性使得自动提取非常困难,因而依据二尖瓣解剖形状的先验知识,采用人机交互方式构造符合二尖瓣生理形状的柱状区域,把该区域作为测地活动轮廓模型的区域约束项,在leve l set框架下对二尖瓣进行分割提取。...二尖瓣的复杂结构和不规则运动特性使得自动提取非常困难,因而依据二尖瓣解剖形状的先验知识,采用人机交互方式构造符合二尖瓣生理形状的柱状区域,把该区域作为测地活动轮廓模型的区域约束项,在leve l set框架下对二尖瓣进行分割提取。该方法通过对大量三维超声瓣膜进行实验,取得了良好的分割效果,能够直接准确提取三维心脏二尖瓣。展开更多
A method based on 3D videos is proposed for multi-target segmentation and tracking with a moving viewing system. A spatiotemporal energy functional is built up to perform motion segmentation and estimation simultaneou...A method based on 3D videos is proposed for multi-target segmentation and tracking with a moving viewing system. A spatiotemporal energy functional is built up to perform motion segmentation and estimation simultaneously. To overcome the limitation of the local minimum problem with the level set method, a convex relaxation method is applied to the 3D spatiotemporal segmentation model. The relaxed convex model is independent of the initial condition. A primal-dual algorithm is used to improve computational efficiency. Several indoor experiments show the validity of the proposed method.展开更多
文摘二尖瓣的复杂结构和不规则运动特性使得自动提取非常困难,因而依据二尖瓣解剖形状的先验知识,采用人机交互方式构造符合二尖瓣生理形状的柱状区域,把该区域作为测地活动轮廓模型的区域约束项,在leve l set框架下对二尖瓣进行分割提取。该方法通过对大量三维超声瓣膜进行实验,取得了良好的分割效果,能够直接准确提取三维心脏二尖瓣。
基金supported by the National Natural Science Foundation of China (No. 60872069)the National Basic Research Program (973)of China (No. 2012CB316400)
文摘A method based on 3D videos is proposed for multi-target segmentation and tracking with a moving viewing system. A spatiotemporal energy functional is built up to perform motion segmentation and estimation simultaneously. To overcome the limitation of the local minimum problem with the level set method, a convex relaxation method is applied to the 3D spatiotemporal segmentation model. The relaxed convex model is independent of the initial condition. A primal-dual algorithm is used to improve computational efficiency. Several indoor experiments show the validity of the proposed method.