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# Ultralytics YOLO 🚀, AGPL-3.0 license
import argparse
import cv2.dnn
import numpy as np
from ultralytics.utils import ASSETS, yaml_load
from ultralytics.utils.checks import check_yaml
CLASSES = yaml_load(check_yaml("coco128.yaml"))["names"]
colors = np.random.uniform(0, 255, size=(len(CLASSES), 3))
def draw_bounding_box(img, class_id, confidence, x, y, x_plus_w, y_plus_h):
"""
Draws bounding boxes on the input image based on the provided arguments.
Args:
img (numpy.ndarray): The input image to draw the bounding box on.
class_id (int): Class ID of the detected object.
confidence (float): Confidence score of the detected object.
x (int): X-coordinate of the top-left corner of the bounding box.
y (int): Y-coordinate of the top-left corner of the bounding box.
x_plus_w (int): X-coordinate of the bottom-right corner of the bounding box.
y_plus_h (int): Y-coordinate of the bottom-right corner of the bounding box.
"""
label = f"{CLASSES[class_id]} ({confidence:.2f})"
color = colors[class_id]
cv2.rectangle(img, (x, y), (x_plus_w, y_plus_h), color, 2)
cv2.putText(img, label, (x - 10, y - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.5, color, 2)
def main(onnx_model, input_image):
"""
Main function to load ONNX model, perform inference, draw bounding boxes, and display the output image.
Args:
onnx_model (str): Path to the ONNX model.
input_image (str): Path to the input image.
Returns:
list: List of dictionaries containing detection information such as class_id, class_name, confidence, etc.
"""
# Load the ONNX model
model: cv2.dnn.Net = cv2.dnn.readNetFromONNX(onnx_model)
# Read the input image
original_image: np.ndarray = cv2.imread(input_image)
[height, width, _] = original_image.shape
# Prepare a square image for inference
length = max((height, width))
image = np.zeros((length, length, 3), np.uint8)
image[0:height, 0:width] = original_image
# Calculate scale factor
scale = length / 640
# Preprocess the image and prepare blob for model
blob = cv2.dnn.blobFromImage(image, scalefactor=1 / 255, size=(640, 640), swapRB=True)
model.setInput(blob)
# Perform inference
outputs = model.forward()
# Prepare output array
outputs = np.array([cv2.transpose(outputs[0])])
rows = outputs.shape[1]
boxes = []
scores = []
class_ids = []
# Iterate through output to collect bounding boxes, confidence scores, and class IDs
for i in range(rows):
classes_scores = outputs[0][i][4:]
(minScore, maxScore, minClassLoc, (x, maxClassIndex)) = cv2.minMaxLoc(classes_scores)
if maxScore >= 0.25:
box = [
outputs[0][i][0] - (0.5 * outputs[0][i][2]),
outputs[0][i][1] - (0.5 * outputs[0][i][3]),
outputs[0][i][2],
outputs[0][i][3],
]
boxes.append(box)
scores.append(maxScore)
class_ids.append(maxClassIndex)
# Apply NMS (Non-maximum suppression)
result_boxes = cv2.dnn.NMSBoxes(boxes, scores, 0.25, 0.45, 0.5)
detections = []
# Iterate through NMS results to draw bounding boxes and labels
for i in range(len(result_boxes)):
index = result_boxes[i]
box = boxes[index]
detection = {
"class_id": class_ids[index],
"class_name": CLASSES[class_ids[index]],
"confidence": scores[index],
"box": box,
"scale": scale,
}
detections.append(detection)
draw_bounding_box(
original_image,
class_ids[index],
scores[index],
round(box[0] * scale),
round(box[1] * scale),
round((box[0] + box[2]) * scale),
round((box[1] + box[3]) * scale),
)
# Display the image with bounding boxes
cv2.imshow("image", original_image)
cv2.waitKey(0)
cv2.destroyAllWindows()
return detections
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("--model", default="yolov8n.onnx", help="Input your ONNX model.")
parser.add_argument("--img", default=str(ASSETS / "bus.jpg"), help="Path to input image.")
args = parser.parse_args()
main(args.model, args.img)