python - IndexError:列表索引超出范围，face_recognition

Question

我正在同时使用开放式简历和人脸识别，但是下面这行代码:

biden_encoding = face_recognition.face_encodings(known_image)[0]

给我以下错误:

IndexError: list index out of range

我已经阅读了此错误，并且大多数结论认为这意味着face_recognition没有检测到帧中的任何面孔。 但是，打开的cv正在检测同一 同一帧内的人脸，因此我不确定face_recognition是否确实未检测到任何人脸，或者我是否由于其他原因收到了IndexError？

获取问题背景所需的所有代码:

check, frame = video.read()
faceCascade = cv2.CascadeClassifier(
    'C:\\Users\\Astroid\\Desktop\\face detection software\\data\\haarcascade_frontalface_alt.xml')

frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

faces = faceCascade.detectMultiScale(
    frame,
    scaleFactor=1.2,
    minNeighbors=5,
)

for x, y, w, h in faces:
    img = cv2.rectangle(frame, (x, y), (x + w, y + h), (255, 0, 0), 1)

    if len(os.listdir("C:\\Users\\Astroid\\Desktop\\face detection software\\saved faces\\")) == 0:

        cv2.imwrite(
            "C:\\Users\\Astroid\\Desktop\\face detection software\\saved faces\\" + "1 faces.jpg", cropped)
    else:
        cv2.imwrite(
            "C:\\Users\\Astroid\Desktop\\face detection software\\unknown faces\\" + " unknown_faces.jpg", cropped)

        known_image = face_recognition.load_image_file(
            "C:\\Users\\Astroid\\Desktop\\face detection software\\saved faces\\" + "1 faces.jpg")

        unknown_image = face_recognition.load_image_file(
           "C:\\Users\\Astroid\Desktop\\face detection software\\unknown faces\\" + " unknown_faces.jpg"

        biden_encoding = face_recognition.face_encodings(known_image)[0]
        print(biden_encoding)#

        unknown_encoding = face_recognition.face_encodings(unknown_image)[0]
        print(unknown_encoding)#

        results = face_recognition.compare_faces([biden_encoding], [unknown_encoding])

        if results >= (60):
            shutil.move(
                "C:\\Users\\Astroid\Desktop\\face detection software\\unknown faces\\" + " unknown_faces.jpg",
                "C:\\Users\\Astroid\\Desktop\\face detection software\\saved faces\\" + (face_num) + (" faces.jpg"))
        else:
            pass

Answer 1

这意味着dlib人脸检测器无法检测到您传入的图像中的人脸。您可以添加try异常块，如下所示:

try:
    image_to_be_matched_encoded = face_recognition.face_encodings(known_image)[0]
except IndexError as e:
    print(e)
    sys.exit(1) # stops code execution in my case you could handle it differently

有关更多信息，请参见: https://github.com/ageitgey/face_recognition/issues/100#issuecomment-307590846