cannot open shared object file: no such file or directory

Initially my python script can run normally, but due to the missing of the object tracking module in the version of my OpenCV (4.4.0), I installed another version of OpenCV, but then the python script shows this error message ever since: cannot open shared object file: no such file or directory.

I have tried uninstalling and installing the OpenCV library, but the issue still persists. All work is done on a raspberry pi powered by Raspbian Buster by the way. In need of some help, I am working on my College Final Year Project… ToT

Below is my coding, it used to work fine except that the Multitracker_create module was missing as mentioned above:

import cv2
import pickle
import numpy as np

# Load the saved RandomForestClassifier model using pickle
with open('saved_model.pkl', 'rb') as model_file:
    rf_classifier = pickle.load(model_file)

# Function to calculate frame difference
def frame_difference(prev_frame, current_frame):
    diff = cv2.absdiff(prev_frame, current_frame)
    _, threshold = cv2.threshold(diff, 30, 255, cv2.THRESH_BINARY)
    return threshold

def getObjects(img, thres, nms, tracker, draw=True, objects=[]):
    # Preprocess the image
    img_resized = cv2.resize(img, (64, 64))
    img_flattened = img_resized.flatten()

    # Reshape the flattened image to match the input shape the RandomForestClassifier expects
    img_flattened_reshaped = img_flattened.reshape(1, -1)

    # Make predictions using the RandomForestClassifier
    binary_prediction = rf_classifier.predict(img_flattened_reshaped)[0]  # Assuming binary classification

    # Initialize bounding box and class name
    box = (0, 0, 64, 64)
    className = ''

    # Continue with the rest of the code for drawing bounding boxes
    if binary_prediction == 1:  # Replace this condition with your actual logic
        # You may need to adjust this based on your RandomForestClassifier output
        box = (0, 0, 64, 64)  # Replace with the actual bounding box coordinates
        className = 'chicken'  # Replace with the actual class name
        print("Binary Prediction:", binary_prediction)
        if draw:
            cv2.rectangle(img, (box[0], box[1]), (box[0] + box[2], box[1] + box[3]), color=(0, 255, 0), thickness=2)
            cv2.putText(img, className.upper(), (box[0] + 10, box[1] + 30),
                        cv2.FONT_HERSHEY_COMPLEX, 1, (0, 255, 0), 2)

        # Start tracking the object using the tracker
        tracker.init(img, (box[0], box[1], box[2], box[3]))

    # Update the tracker and get the new bounding box
    success, tracked_box = tracker.update(img)
    tracked_box = tuple(map(int, tracked_box))

    # Apply Non-Maximum Suppression
    if nms:
        objects.append((tracked_box, className))
        objects = apply_nms(objects)

    return img, objects, tracked_box

def apply_nms(objects):
    # Convert box coordinates to format (x1, y1, x2, y2)
    boxes = np.array([(box[0], box[1], box[0] + box[2], box[1] + box[3]) for box, _ in objects], dtype=np.float32)

    # Get scores (not used in this example, you may have scores from your model)
    scores = np.zeros(len(objects), dtype=np.float32)

    # Apply Non-Maximum Suppression
    indices = cv2.dnn.NMSBoxes(boxes.tolist(), scores, 0.5, 0.4)

    # Filter out non-maximum boxes
    filtered_objects = [objects[i[0]] for i in indices]

    return filtered_objects

# Set up the camera
cap = cv2.VideoCapture(0)
cap.set(3, 640)  # Adjusted camera width
cap.set(4, 480)  # Adjusted camera height

# Create a tracker (e.g., KCF tracker)
tracker = cv2.MultiTracker_create()

# Read the first frame
success, prev_frame =

# Initialize objects list outside the loop
detected_objects = []

while True:
    success, current_frame =

    # Calculate frame difference
    threshold = frame_difference(prev_frame, current_frame)

    # Use the RandomForestClassifier predictions instead of OpenCV DNN
    result, detected_objects, tracked_box = getObjects(current_frame, 0.2, nms=True, tracker=tracker, objects=detected_objects)

    # Draw bounding boxes only when objects are detected
    for (box, className) in detected_objects:
        cv2.rectangle(current_frame, (box[0], box[1]), (box[2], box[3]), color=(0, 255, 0), thickness=2)
        cv2.putText(current_frame, className.upper(), (box[0] + 10, box[1] + 30),
                    cv2.FONT_HERSHEY_COMPLEX, 1, (0, 255, 0), 2)

    cv2.imshow("Output", current_frame)

    # Update the previous frame for the next iteration
    prev_frame = current_frame
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