根据差值法检测移动的物体需
要视频中只有物体移动，一
旦物体移动时背景
也发生移动，
那么
差值法将无法检测到正确的移动物体，因为图像中每个像素的像素值都发生了改变
并且，有时我
们不但需要检测到移动的物体
而且需要能够跟踪这个物体，
无论这个物体是静止还是移动的，都
可以直观地表示其在图像中的位置，进而分析其运动轨迹、运动状态等。
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void visionagin:: Mymeanshiftfetect2()
{
VideoCapture capture("C:\\Users\\86176\\Downloads\\visionimage\\detect.mp4");
if (!capture.isOpened())
{
cout << "视频打开失败！";
}
//是否已计算目标区域直方图的标志
int hascailbrated = 0;
Mat frame;
Mat frame_hsv;
capture.read(frame);
Rect roi = selectROI("截取ROI",frame, true, false);
//定义计算直方图的参数
const int* channels = { 0 };
const int hsize = 16;
const float hrange[] = { 0,180 };
const float* totalrange[] = { hrange };
Mat hist;
Mat hue, backmat;
while (true)
{
if (!capture.read(frame))
{
break;
}
cvtColor(frame, frame_hsv, COLOR_BGR2HSV);
hue.create(frame_hsv.size(), frame_hsv.depth());
int ch[] = { 0,0 };
mixChannels(&frame_hsv, 1, &hue, 1, ch, 1);
if (hascailbrated <= 0)
{
Mat roiimg(hue, roi);
calcHist(&roiimg, 1,channels, roiimg, hist, 1, &hsize, totalrange);
normalize(hist, hist, 0, 255, NORM_MINMAX);
hascailbrated = 1;
}
//计算目标区域反向投影
calcBackProject(&hue, 1, channels, hist, backmat, totalrange);
//均值迁移法跟踪目标
meanShift(backmat, roi, TermCriteria(TermCriteria::EPS | TermCriteria::COUNT, 10, 1));
rectangle(frame, roi, Scalar(0, 0, 255), 3,LINE_AA);
imshow("frame中目标", frame);
int c = waitKey(50);
if (27 == c)
{
break;
}
}
}
?2.自适应均值迁移法实现的目标跟踪
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void visionagin::Mycamshift()
{
VideoCapture capture("C:\\Users\\86176\\Downloads\\visionimage\\detect.mp4");
if (!capture.isOpened())
{
cout << "open failed ! " << endl;
}
int ishisted = 0;
Mat hist, frame, hsv, hue, backmat;
//截取ROI
capture.read(frame);
Rect roi = selectROI("截取roi", frame, true, false);
int histsize = 16;
const int channels[] = { 0 };
const float hrange[] = { 0,180 };
const float* trange[] = { hrange };
while (true)
{
if (!capture.read(frame))
{
break;
}
cvtColor(frame, hsv, COLOR_BGR2HSV);
hue.create(hsv.size(), hsv.depth());
int ch[] = { 0,0 };
mixChannels(&hsv, 1, &hue, 1, ch, 1);
if (ishisted <= 0)
{
Mat roiimg(hue, roi);
calcHist(&roiimg, 1, channels,roiimg, hist, 1, &histsize, trange);
normalize(hist, hist, 0, 255,NORM_MINMAX);
ishisted = 1;
}
calcBackProject(&hue, 1, channels, hist, backmat, trange);
RotatedRect box=CamShift(backmat, roi, TermCriteria(TermCriteria::COUNT | TermCriteria::EPS, 1, 10));
//rectangle(frame, roi, Scalar(0, 0, 255), 3, LINE_AA);
ellipse(frame, box, Scalar(0, 0, 255), 3);
imshow("跟踪结果", frame);
int c = waitKey(50);
if (27 == c)
{
break;
}
}
}