vibe前景提取改进算法

// improveVibeAlgorithm.h

#ifndef IMPROVED_VIBE_ALGORITHM_H
#define IMPROVED_VIBE_ALGORITHM_H

#include 
using namespace std;

#define  WINSIZE 5 

// Vibe改进算法, Barnich, Olivier & Droogenbroeck, Marc. (2009). 
// ViBE: A powerful random technique to estimate the background in video sequences. 
// 945-948. 10.1109/ICASSP.2009.4959741. 
// http://www.cnblogs.com/ydxt/p/6213601.html
class Vibe
{
public:
	Vibe(void);
	Vibe(IplImage *img);
	void SetMinMatch(int nthreshold) { g_MinMatch = nthreshold; }
	void SetRadius(int radius) { g_Radius = radius; }
	void SetSampleNum(int num) { g_SampleNum = num; }
	void SetThreshold(double t) { g_threshold = t; }
	IplImage* GetForeground() { return g_ForeImg; }
	IplImage* GetSegMask() { return g_SegementMask; }
	void Detect(IplImage *img);
	void ForegroundCombineEdge(); // 结合边缘信息  
	void DeleteSmallAreaInForeground(double minArea = 20);//删除小面积区域  
														  // 实现背景更新机制  
	void Update();
	// 实现后处理，主要用形态学算子  
	void PostProcess();

public:
	~Vibe(void);

private:
	void ClearLongLifeForeground(int i_lifeLength = 10); // 清除场景中存在时间较长的像素，i_lifeLength用于控制允许存在的最长时间  
	double AreaDense(IplImage *pFr, int AI, int AJ, int W, int H); //计算(i,j)处邻域大小为W×H的密度  
	int GetRandom(int istart, int iend); // 默认istart=0,iend=15  
	int GetRandom(int random);
	int GetRandom();// 产生一个随机数  
					// 计算两个像素之间的欧式距离  
	double CalcPixelDist(CvScalar bkCs, CvScalar curCs);
	// 按照Kim的方法来计算颜色畸变  
	double CalcuColorDist(CvScalar bkCs, CvScalar curCs);
	int g_SampleNum;// Sample number for the models，默认为20  
	int g_MinMatch; // 当前像素与背景模型匹配的最少个数，默认为2  
	int g_Height;
	int g_Width;
	int g_Radius;// 球体的半径，默认为20  
	int g_offset; //边界的宽和高  
	double g_threshold; // 距离度量的阈值  
	unsigned char ***g_Model;// 保存背景模型    
	IplImage *g_ForeImg;// 保存前景图  
	IplImage *g_Edge;

	IplConvKernel* element;

	IplImage *g_SegementMask; //分割掩膜  
	IplImage *g_UpdateMask; // 更新掩膜  
	IplImage *g_Gray;
	int ** LifeLength; // 记录前景点的生命长度,如果前景点的生命长度到达一定的阈值，则将其融入背景中去,且要随机两次。      
};

#endif // !IMPROVED_VIBE_ALGORITHM_H

// improveVibeAlgorithm.cpp

#include "improveVibeAlgorithm.h"
#include 

using namespace std;
using namespace cv;

Vibe::Vibe(void)
{
	g_Radius = 20;
	g_MinMatch = 2;
	g_SampleNum = 20;
	g_offset = (WINSIZE - 1) / 2;

}

Vibe::Vibe(IplImage *img)
{
	if (!img)
	{
		cout << " The parameter referenced to NUll Pointer!" << endl;
		return;
	}
	this->g_Height = img->height;
	this->g_Width = img->width;

	g_Radius = 20;
	g_MinMatch = 2;
	g_SampleNum = 20;
	g_threshold = 50;
	g_offset = (WINSIZE - 1) / 2;

	g_ForeImg = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);
	g_Gray = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);
	g_Edge = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);
	g_SegementMask = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);
	g_UpdateMask = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);

	element = cvCreateStructuringElementEx(3, 3, 1, 1, CV_SHAPE_CROSS, NULL);

	cvCvtColor(img, g_Gray, CV_BGR2GRAY);

	// 以上完成相关的初始化操作  
	/**********************  以下实现第一帧在每个像素的8邻域内的采样功能，建立对应的背景模型*****************************/

	int i = 0, j = 0, k = 0;
	g_Model = new unsigned char**[g_SampleNum];
	for (k = 0; k g_Height - g_offset || j> g_Width - g_offset)
			{
				cvSetReal2D(g_ForeImg, i, j, 0);
				continue;
			}
			else
			{
				tmpCount = 0;
				dCurrVal = cvGetReal2D(g_Gray, i, j);
				for (k = 0; k= g_MinMatch)
				{
					cvSetReal2D(g_ForeImg, i, j, 0);
					// 背景模型的更新                    
					iR1 = GetRandom(0, 15);
					if (iR1 == 0)
					{
						iR2 = GetRandom();
						g_Model[iR2][i][j] = dCurrVal;
					}

					//进一步更新邻域模型  

					iR1 = GetRandom(0, 15);
					if (iR1 == 0)
					{
						Ri = GetRandom(i);
						Rj = GetRandom(j);
						iR2 = GetRandom();
						g_Model[iR2][Ri][Rj] = dCurrVal;
					}
				}
				else
				{
					cvSetReal2D(g_ForeImg, i, j, 255);
				}
			}
		}
	}

	//ForegroundCombineEdge();  
	DeleteSmallAreaInForeground(2000);
	ClearLongLifeForeground();
	//PostProcess();  
}

double Vibe::AreaDense(IplImage *pFr, int AI, int AJ, int W, int H)
{
	if (AI <= 2 || AJ <= 2 || AJ >= (g_Width - 2) || AI >= (g_Height - 2))
	{
		return 0;
	}
	int Num = 0, i = 0, j = 0;
	double dVal = 0, dense = 0;
	int Total = (2 * H + 1)*(2 * W + 1);
	for (i = AI - H; i <= AI + H; i++)
	{
		for (j = AJ - W; j <= AJ + W; j++)
		{
			dVal = cvGetReal2D(pFr, i, j);
			if (dVal>200)
			{
				Num++;
			}
		}
	}
	dense = (double)Num / (double)Total;
	return dense;
}

void Vibe::ForegroundCombineEdge()
{
	cvZero(g_Edge);
	//cvZero(g_SegementMask);  
	//cvCopy(g_ForeImg,g_SegementMask);  
	cvCanny(g_Gray, g_Edge, 30, 200, 3);
	int i = 0, j = 0;
	double dense;
	double dVal;
	for (i = g_offset; i0.2 && dVal>200)
			{
				cvSetReal2D(g_ForeImg, i, j, 255);
			}
		}
	}

}


void Vibe::DeleteSmallAreaInForeground(double minArea/* =20 */)
{
	//cvZero(g_SegementMask);  
	//cvCopy(g_ForeImg,g_SegementMask);  
	int region_count = 0;
	CvSeq *first_seq = NULL, *prev_seq = NULL, *seq = NULL;
	CvMemStorage*  storage = cvCreateMemStorage();
	cvClearMemStorage(storage);
	cvFindContours(g_ForeImg, storage, &first_seq, sizeof(CvContour), CV_RETR_LIST);
	for (seq = first_seq; seq; seq = seq->h_next)
	{
		CvContour* cnt = (CvContour*)seq;
		if (cnt->rect.width * cnt->rect.height < minArea)
		{
			prev_seq = seq->h_prev;
			if (prev_seq)
			{
				prev_seq->h_next = seq->h_next;
				if (seq->h_next) seq->h_next->h_prev = prev_seq;
			}
			else
			{
				first_seq = seq->h_next;
				if (seq->h_next) seq->h_next->h_prev = NULL;
			}
		}
		else
		{
			region_count++;
		}
	}
	cvZero(g_ForeImg);
	cvDrawContours(g_ForeImg, first_seq, CV_RGB(0, 0, 255), CV_RGB(0, 0, 255), 10, -1);

	/*
	CvContourScanner scanner = cvStartFindContours( g_ForeImg, storage,sizeof(CvContour), CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0) );
	CvSeq *contours=NULL,*c=NULL;
	int poly1Hull0=0;
	int nContours=0;
	double perimScale=100;
	while( (c = cvFindNextContour( scanner )) != 0 )
	{
	double len = cvContourPerimeter( c );
	double q = (g_ForeImg->height + g_ForeImg->width)/perimScale; // calculate perimeter len threshold
	if( len < q ) //Get rid of blob if it's perimeter is too small
	cvSubstituteContour( scanner, 0 );
	else //Smooth it's edges if it's large enough
	{
	CvSeq* newC;
	if( poly1Hull0 ) //Polygonal approximation of the segmentation
	newC = cvApproxPoly( c, sizeof(CvContour), storage, CV_POLY_APPROX_DP, 2, 0 );
	else //Convex Hull of the segmentation
	newC = cvConvexHull2( c, storage, CV_CLOCKWISE, 1 );
	cvSubstituteContour( scanner, newC );
	nContours++;
	}
	}
	contours = cvEndFindContours( &scanner );
	// paint the found regions back into the image
	cvZero( g_ForeImg );
	for( c=contours; c != 0; c = c->h_next )
	cvDrawContours( g_ForeImg, c, cvScalarAll(255), cvScalarAll(0), -1, CV_FILLED, 8,cvPoint(0,0));
	*/

	cvReleaseMemStorage(&storage);
}

void Vibe::ClearLongLifeForeground(int i_lifeLength/* =200 */)
{
	int i = 0, j = 0;
	double dVal = 0;
	double dLife = 0;
	int iR1, iR2 = 0;
	double dCurrVal = 0;
	for (i = g_offset; ii_lifeLength)
			{
				LifeLength[i][j] = 0;
				dCurrVal = cvGetReal2D(g_Gray, i, j);
				// 更新背景模型  
				iR1 = GetRandom();
				iR2 = GetRandom();
				g_Model[iR1][i][j] = dCurrVal;
				g_Model[iR2][i][j] = dCurrVal;
			}
			else
			{
				LifeLength[i][j] = dLife + 1;
			}

		}
	}
}

void Vibe::Update()
{
	cvZero(g_UpdateMask);

}

void Vibe::PostProcess()
{
	cvZero(g_SegementMask);
	cvMorphologyEx(g_ForeImg, g_SegementMask, NULL, element, CV_MOP_OPEN, 1);

}

//算颜色畸变  
double Vibe::CalcuColorDist(CvScalar bkCs, CvScalar curCs)
{
	double r, g, b, br, bg, bb;
	r = curCs.val[0];
	g = curCs.val[1];
	b = curCs.val[2];

	br = bkCs.val[0];
	bg = bkCs.val[1];
	bb = bkCs.val[2];

	double curDist = r*r + g*g*b*b;
	double bkDist = br*br + bg*bg + bb*bb;

	double curBK = r*br + g*bg + b*bb;
	double curbkDist = curBK*curBK;
	double SquareP;
	if (bkDist == 0.0)
	{
		SquareP = 0;
	}
	else
	{
		SquareP = curbkDist / bkDist;
	}
	double dist = sqrtf(curDist - SquareP);
	return dist;
}

double Vibe::CalcPixelDist(CvScalar bkCs, CvScalar curCs)
{
	double tmpDist = pow(bkCs.val[0] - curCs.val[0], 2) + pow(bkCs.val[1] - curCs.val[1], 2) + pow(bkCs.val[2] - curCs.val[2], 2);
	return sqrtf(tmpDist);
}

int Vibe::GetRandom()
{
	int val = g_SampleNum * 1.0 * rand() / RAND_MAX;
	if (val == g_SampleNum)
		return val - 1;
	else
		return val;
}

int Vibe::GetRandom(int random)
{
	int val = random - g_offset + rand() % (2 * g_offset);
	if (valrandom + g_offset)
	{
		val = random + g_offset;
	}
	return val;
}

int Vibe::GetRandom(int istart, int iend)
{
	int val = istart + rand() % (iend - istart);
	return val;
}


Vibe::~Vibe(void)
{
	if (g_ForeImg)
	{
		cvReleaseImage(&g_ForeImg);
	}
	if (g_SegementMask)
	{
		cvReleaseImage(&g_SegementMask);
	}
	if (g_UpdateMask)
	{
		cvReleaseImage(&g_UpdateMask);
	}
	if (g_Gray)
	{
		cvReleaseImage(&g_Gray);
	}

	if (g_Model != NULL)
	{
		delete[]g_Model;
		g_Model = NULL;
	}
}