حدّد المشكلة

from ultralytics import YOLO

model = YOLO("yolo26n.pt")
result = model("https://ultralytics.com/images/bus.jpg", verbose=False)[0]

# The model's job ends here: a class, a box, and a confidence per object.
people = [b.xyxy[0].tolist() for b in result.boxes if result.names[int(b.cls)] == "person"]
vehicles = [b.xyxy[0].tolist() for b in result.boxes if result.names[int(b.cls)] == "bus"]

def share_inside(a, b):
    """Fraction of box a's area that lies inside box b."""
    w = max(0, min(a[2], b[2]) - max(a[0], b[0]))
    h = max(0, min(a[3], b[3]) - max(a[1], b[1]))
    return w * h / ((a[2] - a[0]) * (a[3] - a[1]))

# The decision rule is plain code: change the policy without retraining.
ALERT_SHARE = 0.30
for person in people:
    share = max(share_inside(person, v) for v in vehicles)
    print(f"person at x={person[0]:3.0f}: {share:4.0%} inside the bus box -> {'ALERT' if share > ALERT_SHARE else 'ok'}")

person at x= 49:  70% inside the bus box -> ALERT
person at x=223:  76% inside the bus box -> ALERT
person at x=670:  70% inside the bus box -> ALERT
person at x=  0:  62% inside the bus box -> ALERT

from ultralytics import YOLO

model = YOLO("yolo26n.pt")
result = model("https://ultralytics.com/images/bus.jpg", verbose=False)[0]
people = [b.xyxy[0].tolist() for b in result.boxes if result.names[int(b.cls)] == "person"]
vehicles = [b.xyxy[0].tolist() for b in result.boxes if result.names[int(b.cls)] == "bus"]

def same_ground_line(person, vehicle, tolerance=40):
    """True when the person's feet are level with the vehicle's wheels and inside its width."""
    feet_x, feet_y = (person[0] + person[2]) / 2, person[3]
    return vehicle[0] < feet_x < vehicle[2] and abs(feet_y - vehicle[3]) < tolerance

for person in people:
    alert = any(same_ground_line(person, v) for v in vehicles)
    print(f"person at x={person[0]:3.0f}: feet y={person[3]:.0f}, bus wheels y={vehicles[0][3]:.0f} -> {'ALERT' if alert else 'ok'}")

person at x= 49: feet y=902, bus wheels y=751 -> ok
person at x=223: feet y=861, bus wheels y=751 -> ok
person at x=670: feet y=880, bus wheels y=751 -> ok
person at x=  0: feet y=871, bus wheels y=751 -> ok