opencv学习之路(36)、运动物体检测(一)

一、简介

opencv学习之路(36)、运动物体检测(一)

二、背景减法

opencv学习之路(36)、运动物体检测(一)

图片说明

#include "opencv2/opencv.hpp"using namespace cv;

void main()
{
Mat img1 = imread("E:\\pic\\1.bmp");
Mat img2 = imread("E:\\pic\\55.bmp");
imshow("img1", img1);
imshow("img2", img2); Mat gray1, gray2;
cvtColor(img1, gray1, CV_BGR2GRAY);
cvtColor(img2, gray2, CV_BGR2GRAY); Mat diff;
absdiff(gray1, gray2, diff);
imshow("absdiss", diff);
threshold(diff, diff, , , CV_THRESH_BINARY);
imshow("threshold", diff); Mat element = getStructuringElement(MORPH_RECT, Size(, ));
Mat element2 = getStructuringElement(MORPH_RECT, Size(, ));
erode(diff, diff, element);
imshow("erode", diff);
dilate(diff, diff, element2);
imshow("dilate", diff); vector<vector<Point>> contours;
vector<Vec4i> hierarcy;
findContours(diff, contours, hierarcy, CV_RETR_EXTERNAL, CHAIN_APPROX_NONE); //查找轮廓
vector<Rect> boundRect(contours.size()); //定义外接矩形集合
//drawContours(img2, contours, -1, Scalar(0, 0, 255), 1, 8); //绘制轮廓
int x0=, y0=, w0=, h0=;
for(int i=; i<contours.size(); i++)
{
boundRect[i] = boundingRect((Mat)contours[i]); //查找每个轮廓的外接矩形
x0 = boundRect[i].x; //获得第i个外接矩形的左上角的x坐标
y0 = boundRect[i].y; //获得第i个外接矩形的左上角的y坐标
w0 = boundRect[i].width; //获得第i个外接矩形的宽度
h0 = boundRect[i].height; //获得第i个外接矩形的高度
rectangle(img2, Point(x0, y0), Point(x0+w0, y0+h0), Scalar(, , ), , ); //绘制第i个外接矩形
}
imshow("result", img2); waitKey();
}

opencv学习之路(36)、运动物体检测(一)

视频处理

#include "opencv2/opencv.hpp"
#include<iostream>
using namespace std;
using namespace cv; Mat MoveDetect(Mat background, Mat img)
{
Mat result = img.clone();
Mat gray1, gray2;
cvtColor(background, gray1, CV_BGR2GRAY);
cvtColor(img, gray2, CV_BGR2GRAY); Mat diff;
absdiff(gray1, gray2, diff);
//imshow("absdiss", diff);
threshold(diff, diff, , , CV_THRESH_BINARY);
//imshow("threshold", diff); Mat element = getStructuringElement(MORPH_RECT, Size(, ));
Mat element2 = getStructuringElement(MORPH_RECT, Size(, ));
erode(diff, diff, element);
//imshow("erode", diff); dilate(diff, diff, element2);
//imshow("dilate", diff); vector<vector<Point>> contours;
vector<Vec4i> hierarcy;
findContours(diff, contours, hierarcy, CV_RETR_EXTERNAL, CHAIN_APPROX_NONE); //查找轮廓
vector<Rect> boundRect(contours.size()); //定义外接矩形集合
//drawContours(img2, contours, -1, Scalar(0, 0, 255), 1, 8); //绘制轮廓
int x0=, y0=, w0=, h0=;
for(int i=; i<contours.size(); i++)
{
boundRect[i] = boundingRect((Mat)contours[i]); //查找每个轮廓的外接矩形
x0 = boundRect[i].x; //获得第i个外接矩形的左上角的x坐标
y0 = boundRect[i].y; //获得第i个外接矩形的左上角的y坐标
w0 = boundRect[i].width; //获得第i个外接矩形的宽度
h0 = boundRect[i].height; //获得第i个外接矩形的高度
rectangle(result, Point(x0, y0), Point(x0+w0, y0+h0), Scalar(, , ), , ); //绘制第i个外接矩形
}
return result;
} void main()
{
VideoCapture cap("E://bike.avi");
if(!cap.isOpened()) //检查打开是否成功
return;
Mat frame;
Mat background;
Mat result;
int count=;
while()
{
cap>>frame;
if(!frame.empty())
{
count++;
if(count==)
background = frame.clone(); //提取第一帧为背景帧
imshow("video", frame);
result = MoveDetect(background, frame);
imshow("result", result);
if(waitKey()==)
break;
}
else
break;
}
cap.release();
}

opencv学习之路(36)、运动物体检测(一)   opencv学习之路(36)、运动物体检测(一)

注意:针对不同场景不同目标,腐蚀膨胀等参数会有变化

三、帧差法

opencv学习之路(36)、运动物体检测(一)

void main()
{
VideoCapture cap("bike.avi");
if(!cap.isOpened()) //检查打开是否成功
return;
Mat frame;
Mat result;
Mat temp;
int count=;
while()
{
cap>>frame;
if(!frame.empty())
{
count++;
if(count==)
result = MoveDetect(frame, frame);
else
result = MoveDetect(temp, frame);
imshow("video", frame);
imshow("result", result);
temp = frame.clone();
if(waitKey()==)
break;
}
else
break;
}
cap.release();
}

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