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track vehicle trajectory by using opencv


track vehicle trajectory by using opencv

By : wjy
Date : November 20 2020, 11:01 PM
Does that help If I understood correctly, you are concerned about detecting the object that you are already tracking (lack of detector/tracker communication). In that case you can either:
Pre-check - during detection exclude the areas, where you already track objects or Post-check - discard detected objects, that are near tracked ones (if "selective" detection is not possible for your approach for some reason)
code :


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track the trajectory path in cocos2d

track the trajectory path in cocos2d


By : user2431385
Date : March 29 2020, 07:55 AM
I hope this helps you . You could accomplish this by using an NSTimer or CADisplayLink to repeatedly use the coordinates of the thing in its path of movement (e.g. 6 times a second) and display a small dot at that coordinate. The timer would begin, for example in angry birds, when the bird is first launched, and then stopped when the bird hits something.
bird is launched (timer is created and method is called 6 times a second) Every 1/6 of second a dot is draw at the bird coordinate at that moment The timer is stopped when the bird hits something so no more dots are drawn
OpenCV : Vehicle axle detection

OpenCV : Vehicle axle detection


By : Kristen Arbolado
Date : March 29 2020, 07:55 AM
like below fixes the issue Sorry but i didn't used your code. Here is some other which can help you :
code :
import cv2
import cv2.cv as cv
import numpy as np
import sys

img = cv2.imread('5.jpg',0)
img = cv2.medianBlur(img,5)
cimg = cv2.cvtColor(img,cv2.COLOR_GRAY2BGR)
circles = cv2.HoughCircles(img,cv.CV_HOUGH_GRADIENT,1,240,
                               param1=250,
                               param2=50,
                               minRadius=5,
                               maxRadius=200)
circles = np.uint16(np.around(circles))
for i in circles[0,:]:
    cv2.circle(cimg,(i[0],i[1]),i[2],(0,255,0),2) 
    cv2.circle(cimg,(i[0],i[1]),2,(0,0,255),1)
print circles
cv2.imshow('circles',cimg)
cv2.waitKey(0)
cv2.destroyAllWindows()
How to track trajectory of moving object openCV C++

How to track trajectory of moving object openCV C++


By : KalPrag
Date : March 29 2020, 07:55 AM
like below fixes the issue http://opencv-srf.blogspot.co.uk/2010/09/object-detection-using-color-seperation.html
Found it. When doing it in android, need to make sure the lastX and lastY are updating as well.
Move a rectangular object in predefined trajectory in openCV c++

Move a rectangular object in predefined trajectory in openCV c++


By : 김현민
Date : March 29 2020, 07:55 AM
this will help I haven't worked with Qt in a long time, but basically this will be the gist of it. Also, it is important to note that you can do it in more than one way :) I will tell you 2 that I know. 1 is with a timer which I will explain and the other one is with a widget and the paintEvent which I have not done it, so I will not explain in detail.
code :
// this is the parent... this could be MainWindow for example
timer= new QTimer(this);
// connect the function to it
connect(timer, SIGNAL(timeout()), this, SLOT(NextImage()));
// set that it will be use for more than 1 time
timer.setSingleShot(false);
// set the time you want to use like for 10hz it is 100ms
timer.setInterval(100);
// and start it
timer.start();
void NextImage()
{
  // lets assume that it is 0.1 seconds as in the first part and the speed is pixel per sec
  currentX = currentX + (0.1 * velocityX);
  currentY = currentY + (0.1 * velocityY);
  // make sure it is inside the image bounds
  currentX = std::min(width - 1, std::max(currentX, 0));
  currentY = std::min(height - 1, std::max(currentY, 0));
  // avoid reading and converting the image each time, just keep an original copy to use
  imageBack = originalImage.clone();

  rectangle(imageBack, Point(initialX,initialY), Point(initialX+width,initialY+height), Scalar(intensity),-1,8,0);

  // you were using imshow, don't forget to use waitKey or use a Qt label
  imshow("image",imageBack);
  waitKey(1);

}
OpenCV vehicle detection

OpenCV vehicle detection


By : Emiiiiiil
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Have you tried the dnn object detection module?
https://github.com/opencv/opencv/wiki/TensorFlow-Object-Detection-API
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