On Recovering the Best Rank-r Approximation from Few Entries

no code implementations • 11 Nov 2021 • Shun Xu, Ming Yuan

In this note, we investigate how well we can reconstruct the best rank-$r$ approximation of a large matrix from a small number of its entries.

Automatic Identification of the End-Diastolic and End-Systolic Cardiac Frames from Invasive Coronary Angiography Videos

no code implementations • 6 Oct 2021 • Yinghui Meng, Minghao Dong, Xumin Dai, Haipeng Tang, Chen Zhao, Jingfeng Jiang, Shun Xu, Ying Zhou, Fubao Zhu1, Zhihui Xu, Weihua Zhou

More specifically, a detection algorithm is first used to detect the key points of coronary arteries, and then an optical flow method is employed to track the trajectories of the selected key points.

Anatomy Optical Flow Estimation