关于opencv2.0之后版本中轮廓上点的遍历

[hj0710101707]

大家好！opencv在2.0之后的版本将轮廓以嵌套向量形式存储vector<vector<Point>> contours;
我通过遍历轮廓时，去除了一些不符合要求的轮廓，得到了我想要的目标轮廓，下面我想要遍历
目标轮廓上的坐标点，但是到这我就卡住了，我不知道该如何遍历并获得目标轮廓上点，本人小白，
希望大虾们不吝赐教。

[赵4老师]

LineDDA The LineDDA function determines which pixels should be highlighted for a line defined by the specified starting and ending points. BOOL LineDDA( int nXStart, // x-coordinate of line's starting point int nYStart, // y-coordinate of line's starting point int nXEnd, // x-coordinate of line's ending point int nYEnd, // y-coordinate of line's ending point LINEDDAPROC lpLineFunc, // pointer to callback function LPARAM lpData // pointer to application-defined data ); Parameters nXStart Specifies the x-coordinate of the line's starting point. nYStart Specifies the y-coordinate of the line's starting point. nXEnd Specifies the x-coordinate of the line's ending point. nYEnd Specifies the y-coordinate of the line's ending point. lpLineFunc Pointer to an application-defined callback function. For more information, see the LineDDAProc callback function. lpData Pointer to the application-defined data. Return Values If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. Windows NT: To get extended error information, callGetLastError. Remarks The LineDDA function passes the coordinates for each point along the line, except for the line's ending point, to the application-defined callback function. In addition to passing the coordinates of a point, this function passes any existing application-defined data. The coordinates passed to the callback function match pixels on a video display only if the default transformations and mapping modes are used. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Unsupported. Header: Declared in wingdi.h. Import Library: Use gdi32.lib. See Also Lines and Curves Overview, Line and Curve Functions, LineDDAProc

[hj0710101707]

赵老师的回复基本没有什么帮助...