Calculate the area of a bounding box in pixels.

def calculate_bbox_area(bbox, rows, cols):
    """Calculate the area of a bounding box in pixels."""
    bbox = denormalize_bbox(bbox, rows, cols)
    x_min, y_min, x_max, y_max = bbox[:4]
    area = (x_max - x_min) * (y_max - y_min)
    return area