遥感影像镶嵌及实现(一)；遥感影像镶嵌及实现(二)；遥感影像镶嵌及实现(三)
遥感影像镶嵌及实现(五)；遥感影像镶嵌及实现(六)。

主要内容

1 获取直骨架点及边：使用重叠区域点集，计算多边形2D直骨架（2D Straight Skeleton），获取骨架点；
2 构造有向图，求重叠区域镶嵌线：使用骨架边（skeleton edge），构建有向图，找到从交叉点起始到结束的最短距离。那么由起始点，经过最短距离的骨架点，到结束点构成重叠区域的镶嵌线；
3 构造贡献区域：由有效区域点集同重叠区域镶嵌线点集，分别构成两幅图镶嵌后、各自的贡献区域；
4 demo。

1 获取直骨架点及边

(1)重叠区域点，多边形

(2)2D直骨架
　　求2D直骨架时注意：重叠区域点为顺时针排列，在压入Polygon_2 poly时，需要逆时针。图中蓝色（16）和绿色（19）线为骨架边，蓝色与绿色线的交点为骨架点（17）。

(354723,4.43218e+006)contour vertex//轮廓点 19个，20个其中有一个回路
(355805,4.43199e+006)contour vertex
(355937,4.43181e+006)contour vertex
(356012,4.43172e+006)contour vertex
(358214,4.43119e+006)contour vertex
(358198,4.43111e+006)contour vertex
(358286,4.43109e+006)contour vertex
(357810,4.42914e+006)contour vertex
(357580,4.42798e+006)contour vertex
(396404,4.41855e+006)contour vertex
(397306,4.42227e+006)contour vertex
(396520,4.42249e+006)contour vertex
(395673,4.42262e+006)contour vertex
(395078,4.42289e+006)contour vertex
(394422,4.42307e+006)contour vertex
(393935,4.42308e+006)contour vertex
(393843,4.42315e+006)contour vertex
(394376,4.42544e+006)contour vertex
(355312,4.43462e+006)contour vertex
(356195,4.43201e+006)skeleton vertex//骨架点 17个
(396348,4.4217e+006)skeleton vertex
(358990,4.42888e+006)skeleton vertex
(356495,4.43309e+006)skeleton vertex
(356213,4.43315e+006)skeleton vertex
(356786,4.4329e+006)skeleton vertex
(359772,4.4322e+006)skeleton vertex
(359823,4.43212e+006)skeleton vertex
(359973,4.43208e+006)skeleton vertex
(395162,4.42092e+006)skeleton vertex
(393269,4.42123e+006)skeleton vertex
(395008,4.42084e+006)skeleton vertex
(394409,4.42105e+006)skeleton vertex
(394140,4.42112e+006)skeleton vertex
(391206,4.42224e+006)skeleton vertex
(361134,4.43019e+006)skeleton vertex
(390659,4.42313e+006)skeleton vertex
(355312,4.43462e+006)->(354723,4.43218e+006) contour//轮廓边 38
(354723,4.43218e+006)->(355312,4.43462e+006) contour
(354723,4.43218e+006)->(355805,4.43199e+006) contour
(355805,4.43199e+006)->(354723,4.43218e+006) contour
(355805,4.43199e+006)->(355937,4.43181e+006) contour
(355937,4.43181e+006)->(355805,4.43199e+006) contour
(355937,4.43181e+006)->(356012,4.43172e+006) contour
(356012,4.43172e+006)->(355937,4.43181e+006) contour
(356012,4.43172e+006)->(358214,4.43119e+006) contour
(358214,4.43119e+006)->(356012,4.43172e+006) contour
(358214,4.43119e+006)->(358198,4.43111e+006) contour
(358198,4.43111e+006)->(358214,4.43119e+006) contour
(358198,4.43111e+006)->(358286,4.43109e+006) contour
(358286,4.43109e+006)->(358198,4.43111e+006) contour
(358286,4.43109e+006)->(357810,4.42914e+006) contour
(357810,4.42914e+006)->(358286,4.43109e+006) contour
(357810,4.42914e+006)->(357580,4.42798e+006) contour
(357580,4.42798e+006)->(357810,4.42914e+006) contour
(357580,4.42798e+006)->(396404,4.41855e+006) contour
(396404,4.41855e+006)->(357580,4.42798e+006) contour
(396404,4.41855e+006)->(397306,4.42227e+006) contour
(397306,4.42227e+006)->(396404,4.41855e+006) contour
(397306,4.42227e+006)->(396520,4.42249e+006) contour
(396520,4.42249e+006)->(397306,4.42227e+006) contour
(396520,4.42249e+006)->(395673,4.42262e+006) contour
(395673,4.42262e+006)->(396520,4.42249e+006) contour
(395673,4.42262e+006)->(395078,4.42289e+006) contour
(395078,4.42289e+006)->(395673,4.42262e+006) contour
(395078,4.42289e+006)->(394422,4.42307e+006) contour
(394422,4.42307e+006)->(395078,4.42289e+006) contour
(394422,4.42307e+006)->(393935,4.42308e+006) contour
(393935,4.42308e+006)->(394422,4.42307e+006) contour
(393935,4.42308e+006)->(393843,4.42315e+006) contour
(393843,4.42315e+006)->(393935,4.42308e+006) contour
(393843,4.42315e+006)->(394376,4.42544e+006) contour
(394376,4.42544e+006)->(393843,4.42315e+006) contour
(394376,4.42544e+006)->(355312,4.43462e+006) contour
(355312,4.43462e+006)->(394376,4.42544e+006) contour
(354723,4.43218e+006)->(356213,4.43315e+006) bisector//平分线70（（16+19）*2）
(356213,4.43315e+006)->(354723,4.43218e+006) bisector
(355805,4.43199e+006)->(356495,4.43309e+006) bisector
(356495,4.43309e+006)->(355805,4.43199e+006) bisector
(355937,4.43181e+006)->(356195,4.43201e+006) bisector
(356195,4.43201e+006)->(355937,4.43181e+006) bisector
(356012,4.43172e+006)->(356195,4.43201e+006) bisector
(356195,4.43201e+006)->(356012,4.43172e+006) bisector
(358214,4.43119e+006)->(359772,4.4322e+006) bisector
(359772,4.4322e+006)->(358214,4.43119e+006) bisector
(358198,4.43111e+006)->(359823,4.43212e+006) bisector
(359823,4.43212e+006)->(358198,4.43111e+006) bisector
(358286,4.43109e+006)->(359973,4.43208e+006) bisector
(359973,4.43208e+006)->(358286,4.43109e+006) bisector
(357810,4.42914e+006)->(358990,4.42888e+006) bisector
(358990,4.42888e+006)->(357810,4.42914e+006) bisector
(357580,4.42798e+006)->(358990,4.42888e+006) bisector
(358990,4.42888e+006)->(357580,4.42798e+006) bisector
(396404,4.41855e+006)->(395008,4.42084e+006) bisector
(395008,4.42084e+006)->(396404,4.41855e+006) bisector
(397306,4.42227e+006)->(396348,4.4217e+006) bisector
(396348,4.4217e+006)->(397306,4.42227e+006) bisector
(396520,4.42249e+006)->(396348,4.4217e+006) bisector
(396348,4.4217e+006)->(396520,4.42249e+006) bisector
(395673,4.42262e+006)->(395162,4.42092e+006) bisector
(395162,4.42092e+006)->(395673,4.42262e+006) bisector
(395078,4.42289e+006)->(394409,4.42105e+006) bisector
(394409,4.42105e+006)->(395078,4.42289e+006) bisector
(394422,4.42307e+006)->(394140,4.42112e+006) bisector
(394140,4.42112e+006)->(394422,4.42307e+006) bisector
(393935,4.42308e+006)->(393269,4.42123e+006) bisector
(393269,4.42123e+006)->(393935,4.42308e+006) bisector
(393843,4.42315e+006)->(391206,4.42224e+006) bisector
(391206,4.42224e+006)->(393843,4.42315e+006) bisector
(394376,4.42544e+006)->(390659,4.42313e+006) bisector
(390659,4.42313e+006)->(394376,4.42544e+006) bisector
(355312,4.43462e+006)->(356213,4.43315e+006) bisector
(356213,4.43315e+006)->(355312,4.43462e+006) bisector
(356195,4.43201e+006)->(356786,4.4329e+006) bisector
(356786,4.4329e+006)->(356195,4.43201e+006) bisector
(396348,4.4217e+006)->(395162,4.42092e+006) bisector
(395162,4.42092e+006)->(396348,4.4217e+006) bisector
(358990,4.42888e+006)->(361134,4.43019e+006) bisector
(361134,4.43019e+006)->(358990,4.42888e+006) bisector
(356495,4.43309e+006)->(356213,4.43315e+006) bisector
(356213,4.43315e+006)->(356495,4.43309e+006) bisector
(356495,4.43309e+006)->(356786,4.4329e+006) bisector
(356786,4.4329e+006)->(356495,4.43309e+006) bisector
(356786,4.4329e+006)->(359772,4.4322e+006) bisector
(359772,4.4322e+006)->(356786,4.4329e+006) bisector
(359772,4.4322e+006)->(359823,4.43212e+006) bisector
(359823,4.43212e+006)->(359772,4.4322e+006) bisector
(359823,4.43212e+006)->(359973,4.43208e+006) bisector
(359973,4.43208e+006)->(359823,4.43212e+006) bisector
(359973,4.43208e+006)->(361134,4.43019e+006) bisector
(361134,4.43019e+006)->(359973,4.43208e+006) bisector
(395162,4.42092e+006)->(395008,4.42084e+006) bisector
(395008,4.42084e+006)->(395162,4.42092e+006) bisector
(393269,4.42123e+006)->(394140,4.42112e+006) bisector
(394140,4.42112e+006)->(393269,4.42123e+006) bisector
(393269,4.42123e+006)->(391206,4.42224e+006) bisector
(391206,4.42224e+006)->(393269,4.42123e+006) bisector
(395008,4.42084e+006)->(394409,4.42105e+006) bisector
(394409,4.42105e+006)->(395008,4.42084e+006) bisector
(394409,4.42105e+006)->(394140,4.42112e+006) bisector
(394140,4.42112e+006)->(394409,4.42105e+006) bisector
(391206,4.42224e+006)->(390659,4.42313e+006) bisector
(390659,4.42313e+006)->(391206,4.42224e+006) bisector
(361134,4.43019e+006)->(390659,4.42313e+006) bisector
(390659,4.42313e+006)->(361134,4.43019e+006) bisector

(3)交点，交叉点(重叠区域镶嵌线起始、结束点)
　　下图中黄色圆圈为两幅影像有效区域线的8个交点，黑色带有×的为交叉点

2 构造有向图，求重叠区域镶嵌线
(1)由骨架点（skeleton vertex）和平分线（bisector）构建图；
　　其中建图的起始、结束点为对于有效区域的进出点。
(2)使用dijkstra查找到起始、结束点之间的最短距离路径。
下图中红色小框为最短路径点，即为镶嵌线点：

3 构造贡献区域
根据有效区域点、交叉点、重叠区域点构造每幅影像的贡献区域：

4 demo
(1)两幅影像无压缩有效区域

(2)两幅影像压缩有效区域

(3)交点
<1> 左侧交点

<2>右侧交点

(4)镶嵌线与有效区域叠加

(5)镶嵌线与有效区域叠加细节
<1>左侧细节

<2>右侧细节

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