检测最近的脸

Question

我使用以下代码来检测面部

 detections = face_cascade.detectMultiScale(
    gray,
    scaleFactor=1.1,
    minNeighbors=5,
    minSize=(30, 30),
    flags=cv2.CASCADE_SCALE_IMAGE
)

for i in range(len(detections)):
        face_i = detections[i]
        gray_i = detections[i]
        x, y, w, h = face_i

我希望只检测距离相机最近的脸部。我怎么能这样做？