We report, to the best of our knowledge, the first demonstration of solid-state optical refrigeration of a Ho-doped material. A 1 mol% Ho-doped yttrium lithium fluoride (YLF) crystal is cooled by mid-IR laser radiation, and its external quantum efficiency
Holographic head-mounted display (HHMD) is a specific application of holography. The previous conventional computer-generated hologram (CGH) generation method has a large redundancy and suffers from a heavy computing burden in the HHMD. A low redundancy a
Mean Shift是一种基于特征的对目标实现快速跟踪的算法,传统的Mean Shift算法由于跟踪中物体的尺度变化会使跟踪偏离目标乃至跟踪失败,并且原有的自适应地对跟踪窗宽的调整,是基于对核窗宽的改变来得到的。在"固定跟踪窗宽—改变核窗宽"的基础上对目标进行跟踪,对目标空间定位精度进行了评估与分析,通过实验结果表明改变核函数参数能改善目标跟踪的精度。
The point clouds scanned by a 3 D laser scanner may be affine transformed when the size and posture of the objects being scanned are different. This type of problem is common, but few algorithms can s