OpenCV库版本2.42.我想在BackgroundSubtractorMOG2对象中设置一个参数,例如
BackgroundSubtractorMOG2 bgr;
// the following doesn't work because 'nmixtures','backgroundRatio'
// and 'fVarMin' are a protected members.
bgr.nmixtures = 3;
bgr.backgroundRatio = 0.9;
bgr.fVarMin = 5;
// the following works
bgr.set('nmixtures',3);
// both of the following lines will give a run-time error
// `Access violation reading location 0x0000000000000008.`
bgr.set("backgroundRatio",0.9);
bgr.set("fVarMin",5);
backgroundRatio和fVarMin是控制算法的参数.用户应该能够根据documentation更改这些参数.
如何设置BackgroundSubtractorMOG2的参数？
解决方法
我刚刚查看了OpenCV源代码,并在文件/modules/video/src/video_init.cpp中找到了有趣的初始化.这里是：
CV_INIT_ALGORITHM(BackgroundSubtractorMOG2,"BackgroundSubtractor.MOG2",obj.info()->addParam(obj,"history",obj.history);
obj.info()->addParam(obj,"nmixtures",obj.nmixtures);
obj.info()->addParam(obj,"varThreshold",obj.varThreshold);
obj.info()->addParam(obj,"detectShadows",obj.bShadowDetection));
似乎可以使用方法集仅设置这四个参数.
还要看一下文件modules / video / src / bgfg_gaussmix2.cpp,它有一个BackgroundSubtractorMOG2类.它有以下字段：
float fVarInit; float fVarMax; float fVarMin; //initial standard deviation for the newly generated components. //It will will influence the speed of adaptation. A good guess should be made. //A simple way is to estimate the typical standard deviation from the images. //I used here 10 as a reasonable value
并且值fVarMin(您想要更改)设置为：
fVarMin = defaultVarMin2
在两个构造函数中.以下是所有这些：
static const float defaultVarInit2 = 15.0f; // initial variance for new components static const float defaultVarMax2 = 5*defaultVarInit2; static const float defaultVarMin2 = 4.0f;
有趣的是,这个值没有在任何其他文件中使用,所以现在似乎无法改变它.您可以将此问题直接发布到OpenCV bugtracker.
