I have tried to run this code but get an Attribute Error. Any help would be greatly appreciated.

 import cv2 import sys (major_ver, minor_ver, subminor_ver) = (cv2.__version__).split('.') if __name__ == '__main__': # Set up tracker. # Instead of MIL, you can also use tracker_types = ['BOOSTING', 'MIL','KCF', 'TLD', 'MEDIANFLOW', 'CSRT', 'MOSSE'] tracker_type = tracker_types[5] if int(minor_ver) < 3: tracker = cv2.cv2.Tracker_create(tracker_type) else: if tracker_type == 'BOOSTING': tracker = cv2.TrackerBoosting_create() if tracker_type == 'MIL': tracker = cv2.TrackerMIL_create() if tracker_type == 'KCF': tracker = cv2.TrackerKCF_create() if tracker_type == 'TLD': tracker = cv2.TrackerTLD_create() if tracker_type == 'MEDIANFLOW': tracker = cv2.TrackerMedianFlow_create() if tracker_type == 'CSRT': tracker = cv2.TrackerCSRT_create() if tracker_type == 'MOSSE': tracker = cv2.TrackerMOSSE_create() # Read video video = cv2.VideoCapture("./videos/chaplin.mp4") # Exit if video not opened. if not video.isOpened(): print("Could not open video") sys.exit() # Read first frame. ok, frame = video.read() if not ok: print('Cannot read video file') sys.exit() # Define an initial bounding box bbox = (287, 23, 86, 320) # Uncomment the line below to select a different bounding box bbox = cv2.selectROI(frame, False) # Initialize tracker with first frame and bounding box ok = tracker.init(frame, bbox) while True: # Read a new frame ok, frame = video.read() if not ok: break # Start timer timer = cv2.getTickCount() # Update tracker ok, bbox = tracker.update(frame) # Calculate Frames per second (FPS) fps = cv2.getTickFrequency() / (cv2.getTickCount() - timer); # Draw bounding box if ok: # Tracking success p1 = (int(bbox[0]), int(bbox[1])) p2 = (int(bbox[0] + bbox[2]), int(bbox[1] + bbox[3])) cv2.rectangle(frame, p1, p2, (255,0,0), 2, 1) else : # Tracking failure cv2.putText(frame, "Tracking failure detected", (100,80), cv2.FONT_HERSHEY_SIMPLEX, 0.75,(0,0,255),2) # Display tracker type on frame cv2.putText(frame, tracker_type + " Tracker", (100,20), cv2.FONT_HERSHEY_SIMPLEX, 0.75, (50,170,50),2); # Display FPS on frame cv2.putText(frame, "FPS : " + str(int(fps)), (100,50), cv2.FONT_HERSHEY_SIMPLEX, 0.75, (50,170,50), 2); # Display result cv2.imshow("Tracking", frame) # Exit if ESC pressed k = cv2.waitKey(1) & 0xff if k == 27 : break

Output:

Traceback (most recent call last): File "C:\Users\Jatin\OpenCV-Object-Tracking\index.py", line 15, in <module> tracker = cv2.cv2.Tracker_create(tracker_type)
AttributeError: module 'cv2.cv2' has no attribute 'Tracker_create'

3

6 Answers

It depends on which packages of OpenCV and the version you have installed.

I believe you need OpenCV 3.4+ to run those models. Some tracker models are available in 3.2, and 3.3. All trackers in your script are available in 3.4

OpenCV packages:opencv-python: This repository contains the main modules of the OpenCV library.

opencv-contrib-python: The opencv-contrib-python repository contains both the main modules along with the contrib modules

python -m pip install opencv-contrib-python, check to see if you have 3.4+, with pip show opencv .

See how to install opencv for more details

Updates

As @user48956 pointed out opencv v 4.5.x has moved some of these algorithms to cv2.legacy. For example, to access TrackerMOSSE_create function. You would have to get it fromcv2.legacy.TrackerMOSSE_create.

I would recommend keeping up with opencv GitHub as some functions/algorithms will likely move around or be deleted.

5

If you are using OpenCV 4 or above then the above code may not work.

if int(minor_ver) < 3: line breaks for OpenCV 4

You need to install just opencv contrib for this experiment

My Virtual Env contains

pip install -r requirements.txt

requirements.txt

dlib==19.19.0
imutils==0.5.3
numpy==1.18.4
opencv-contrib-python==4.2.0.34
scipy==1.4.1

modified code, compatible with OpenCV 4 version

tracker.py

import cv2
import sys
(major_ver, minor_ver, subminor_ver) = (cv2.__version__).split('.')
print(cv2.__version__)
if __name__ == '__main__': # Set up tracker. # Instead of MIL, you can also use tracker_types = ['BOOSTING', 'MIL','KCF', 'TLD', 'MEDIANFLOW', 'CSRT', 'MOSSE'] tracker_type = tracker_types[6] if int(major_ver) < 4 and int(minor_ver) < 3: tracker = cv2.cv2.Tracker_create(tracker_type) else: if tracker_type == 'BOOSTING': tracker = cv2.TrackerBoosting_create() if tracker_type == 'MIL': tracker = cv2.TrackerMIL_create() if tracker_type == 'KCF': tracker = cv2.TrackerKCF_create() if tracker_type == 'TLD': tracker = cv2.TrackerTLD_create() if tracker_type == 'MEDIANFLOW': tracker = cv2.TrackerMedianFlow_create() if tracker_type == 'CSRT': tracker = cv2.TrackerCSRT_create() if tracker_type == 'MOSSE': tracker = cv2.TrackerMOSSE_create() # Read video video = cv2.VideoCapture(0) # Exit if video not opened. if not video.isOpened(): print("Could not open video") sys.exit() # Read first frame. ok, frame = video.read() if not ok: print('Cannot read video file') sys.exit() # Define an initial bounding box bbox = (287, 23, 86, 320) # Uncomment the line below to select a different bounding box bbox = cv2.selectROI(frame, False) # Initialize tracker with first frame and bounding box ok = tracker.init(frame, bbox) while True: # Read a new frame ok, frame = video.read() if not ok: break # Start timer timer = cv2.getTickCount() # Update tracker ok, bbox = tracker.update(frame) # Calculate Frames per second (FPS) fps = cv2.getTickFrequency() / (cv2.getTickCount() - timer); # Draw bounding box if ok: # Tracking success p1 = (int(bbox[0]), int(bbox[1])) p2 = (int(bbox[0] + bbox[2]), int(bbox[1] + bbox[3])) cv2.rectangle(frame, p1, p2, (255,0,0), 2, 1) else : # Tracking failure cv2.putText(frame, "Tracking failure detected", (100,80), cv2.FONT_HERSHEY_SIMPLEX, 0.75,(0,0,255),2) # Display tracker type on frame cv2.putText(frame, tracker_type + " Tracker", (100,20), cv2.FONT_HERSHEY_SIMPLEX, 0.75, (50,170,50),2); # Display FPS on frame cv2.putText(frame, "FPS : " + str(int(fps)), (100,50), cv2.FONT_HERSHEY_SIMPLEX, 0.75, (50,170,50), 2); # Display result cv2.imshow("Tracking", frame) # Exit if ESC pressed k = cv2.waitKey(1) & 0xff if k == 27 : break

2

For at least for:

• opencv-contrib-python==4.5.2.52

you need to replace:

cv2.TrackerMOSSE_create()

with...

cv2.legacy.TrackerMOSSE_create()

I was getting an error with:tracker = cv2.TrackerMOSSE.create()

even thought I had already installed: opencv-contrib-python

I was able to fix the error by using this instead:tracker = cv2.legacy_TrackerMOSSE.create()

My version of Python is 3.7, which doesn't seem to ignore the code below.

if int(minor_ver) < 3: tracker = cv2.cv2.Tracker_create(tracker_type)

I simply deleted it and the module runs.

---

An unrelated but hopefully helpful suggestion. At the end of the code above, I added a `destroyAllWindows() command, which cleans up the viewer:

 if k == 27: cv2.destroyAllWindows() break

3

Just install the following.

pip install opencv-contrib-python

here by using csrt tracker.

import cv2
cap = cv2.VideoCapture("video_path")
tracker = cv2.TrackerCSRT_create()
ret, frame = cap.read()
bbox = cv2.selectROI(frame, False)
tracker.init(frame, bbox)
while True: frame_id = 0 ret, frame = cap.read() success, bbox = tracker.update(frame) if success: x, y, w, h = [int(i) for i in bbox] cv2.rectangle(frame, (x, y), (x + w, y + h), (255, 0, 0), 2) cv2.imshow("Tracking", frame) if cv2.waitKey(1) & 0xFF == ord('q'): break
cap.release()
cv2.destroyAllWindows()

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