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Home/ Questions/Q 4576
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Ghulam Nabi
Ghulam Nabi
Asked: February 1, 20232023-02-01T14:24:18+00:00 2023-02-01T14:24:18+00:00

yoloV8: how I can to predict and save the image with boxes on the objects with pytorch

import torch
import glob
import os
import pathlib
from ultralytics import YOLO

model_name='MyBest.pt'
model = torch.hub.load(<?>, 'custom', source='local', path = model_name, force_reload = True)
results = model(person.png)  # predict on an image
results.save()
yolov8: how i can to predict and save the image with boxes on the objects with pytorch
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    Ghulam Nabi
    2023-02-01T14:25:57+00:00Added an answer on February 1, 2023 at 2:25 pm

    The code you posted is not complete and there are some missing pieces. To predict and save an image with boxes on the objects using YOLOv8 in PyTorch, you need to follow these steps:

    1. Load the YOLOv8 model into PyTorch using the torch.hub.load() function.
    2. Load an image into memory.
    3. Preprocess the image to match the input format expected by the YOLOv8 model.
    4. Pass the preprocessed image to the model for prediction.
    5. Extract the predictions from the model’s output.
    6. Draw boxes around the objects in the image using the predictions.
    7. Save the image with the boxes to disk.

    Here is an example implementation of the code to perform the steps mentioned above:

    import torch
    import cv2
    import numpy as np
    
    # Load the YOLOv8 model
    model = torch.hub.load('ultralytics/yolov5', 'yolov5s', pretrained=True)
    model.eval();
    
    # Load an image
    img = cv2.imread('person.png')
    
    # Preprocess the image
    img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
    img = img.transpose(2, 0, 1)
    img = np.ascontiguousarray(img, dtype=np.float32)
    img /= 255.0
    img = torch.from_numpy(img)
    img = img.unsqueeze(0)
    
    # Pass the image to the model for prediction
    output = model(img)
    
    # Extract the predictions from the model output
    predictions = output[0]['boxes'].data.cpu().numpy()
    scores = output[0]['scores'].data.cpu().numpy()
    
    # Draw boxes around the objects in the image
    for i, box in enumerate(predictions):
        if scores[i] < 0.5:
            continue
        x1, y1, x2, y2 = box
        cv2.rectangle(img, (int(x1), int(y1)), (int(x2), int(y2)), (255, 0, 0), 2)
    
    # Save the image with the boxes
    cv2.imwrite('person_with_boxes.png', img)
    

     

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