Indoor Coverage Path Planning: Survey, Implementation, Analysis
概况：讲的是覆盖路径规划（CPP）算法，本文中介绍了六种算法，并进行了深入的比较，在550多个室内地图中做了实验。
一、介绍
本文是基于68论文的补充。
本文提供了广泛的覆盖路径规划方法，包括一种精确的单元分解方法、基于三单元网格的规划方法、一种轮廓线驱动方法和一种艺术画廊问题的变体。（不知道准不准确，英文是one exact cell decomposition method, three cell grid-based planners, one contour line-driven approach and one variant of the art gallery problem）
区分了在线算法（基于传感器的覆盖算法）和离线算法，本文的工作集中在离线算法上，这些算法可以利用环境的现成的地图。
二、相关的工作
总结讨论了68论文以及其他比较常见的算法：
经典的网格划分方法（论文10-12）：依赖于多边形形状和障碍物。解决这一问题的方法：Morse-based网格划分方法（论文13）。
Landmark-based网格划分方法（论文14）：适用于多种拓扑结构。
Boustrophedon网格划分方法（论文1115）
旋转扫描单元格的Boustrophedon网格划分方法（论文16）
Wavefront 算法（论文17）：定义了起点和目标点，接近目标前将这拨钱
Spanning Tree算法（论文18）：将自由空间分割为巨型的单元，在每个巨型单元下有四个小单元，可以利用搜索树来覆盖这些单元。
Neural Network-based算法（论文19）：受生物学启发，将网格视作神经元，通过相邻网格的激活状态访问网格。
全覆盖问题被视作Art Gallery Problem（论文20）或者Watchman Tour Problem 。
在组合整数线性规划方法的基础上，利用重加权凸松弛扩大可处理规模的一种新方法（论文9）
从中挑选6种全覆盖路径算法进行评价。
三、方法
1、预处理
（1）地图分割。看作Traveling Salesman Problem，这篇论文的作者此前写过一篇相关论文7 。
（2）房间方向规范化。墙壁对准的启发式算法（论文61216）、Canny边缘检测算法、CV的Hough直线检测算法（论文22）
（3）覆盖区域： skeleton or Voronoi graph 论文2324。网格最多为l=√2·rq 。
2、 Boustrophedon Coverage Path Planning 论文1115 。水平扫描，到达临界点时执行合并或者分割。
3、Grid-based Traveling Salesman Coverage Path Planning 。基于旅行商TSP问题。与Concorde solver完全一致（论文25），或与遗传算法或简单而快速的最近邻类似。
4、Neural Network-based Coverage Path Planning 。基于神经网络的全覆盖算法。结合生物学的神经元连接8个邻居，排斥墙壁和障碍物。论文19
5、Grid-based Local Energy Minimization。局部能量最小驱动。 论文5
6、Contour Line-based Coverage Path Planning。等高线法。论文726
7、Convex Sensor Placement Coverage Path Planning。凸传感覆盖算法。论文9
四、评估
1、覆盖率 96-99%
2、传感器视野
3、实测结果
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