11 帧差法获取运动

帧差法

 

 

三帧差法

录频工具转gif

 

 

#include "core/core.hpp"
#include "highgui/highgui.hpp"
#include "imgproc/imgproc.hpp"

using namespace cv;

int main(int argc, char *argv[])
{
	VideoCapture videoCap(0);
	if (!videoCap.isOpened())
	{
		return -1;
	}
	double videoFPS = videoCap.get(CV_CAP_PROP_FPS);  //获取帧率
	double videoPause = 1000 / videoFPS;
	Mat framePrePre; //上上一帧
	Mat framePre; //上一帧
	Mat frameNow; //当前帧
	Mat frameDet; //运动物体
	videoCap >> framePrePre;
	videoCap >> framePre;
	cvtColor(framePrePre, framePrePre, CV_RGB2GRAY);
	cvtColor(framePre, framePre, CV_RGB2GRAY);
	int save = 0;
	while (true)
	{
		videoCap >> frameNow;
	//	if (frameNow.empty() || waitKey() == 27)
	if (frameNow.empty() )
		{
			break;
		}
		cvtColor(frameNow, frameNow, CV_RGB2GRAY);
		Mat Det1;
		Mat Det2;
		absdiff(framePrePre, framePre, Det1);  //帧差1
		absdiff(framePre, frameNow, Det2);     //帧差2
		threshold(Det1, Det1, 0, 255, CV_THRESH_OTSU);  //自适应阈值化
		threshold(Det2, Det2, 0, 255, CV_THRESH_OTSU);
		Mat element = getStructuringElement(0, Size(3, 3));  //膨胀核
		dilate(Det1, Det1, element);    //膨胀
		dilate(Det2, Det2, element);
		bitwise_and(Det1, Det2, frameDet);
		framePrePre = framePre;
		framePre = frameNow;
		imshow("Video", frameNow);
		imshow("Detection", frameDet);
		waitKey(1);
	}
	return 0;
}

　　

来源：https://www.cnblogs.com/kekeoutlook/p/11638613.html