Question

我是OpenCV和Python的新手，但设法通过在线教程进行了安装。我正在尝试运行以下脚本：

from scipy.spatial import distance as dist
from imutils.video import VideoStream
from imutils import face_utils
from threading import Thread
import numpy as np
import argparse
import imutils
import time
import dlib
import cv2
import subprocess
def sound_alarm(path):
# play an alarm sound
subprocess.call(["afplay",path])

def eye_aspect_ratio(eye):
A = dist.euclidean(eye[1], eye[5])
B = dist.euclidean(eye[2], eye[4])
C = dist.euclidean(eye[0], eye[3])
ear = (A + B) / (2.0 * C)
return ear

   ap = argparse.ArgumentParser()
   ap.add_argument("-p", "--shape-predictor", required=True,
   help="path to facial landmark predictor")
   ap.add_argument("-a", "--alarm", type=str, default="",
    help="path alarm .WAV file")
   ap.add_argument("-w", "--webcam", type=int, default=0,
    help="index of webcam on system")
   args = vars(ap.parse_args())

   EYE_AR_THRESH = 0.25
   EYE_AR_CONSEC_FRAMES = 10
   COUNTER = 0
   ALARM_ON = False

   print("[INFO] loading facial landmark predictor...")
   detector = dlib.get_frontal_face_detector()
   predictor = dlib.shape_predictor(args["shape_predictor"])

(lStart, lEnd) = face_utils.FACIAL_LANDMARKS_IDXS["left_eye"]
(rStart, rEnd) = face_utils.FACIAL_LANDMARKS_IDXS["right_eye"]

print("[INFO] starting video stream thread...")
vs = VideoStream(src=args["webcam"]).start()
time.sleep(1.0)

while True:
    frame = vs.read()
    frame = imutils.resize(frame, width=450)
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    rects = detector(gray, 0)
    for rect in rects:
        shape = predictor(gray, rect)
        shape = face_utils.shape_to_np(shape)
        leftEye = shape[lStart:lEnd]
        rightEye = shape[rStart:rEnd]
        leftEAR = eye_aspect_ratio(leftEye)
        rightEAR = eye_aspect_ratio(rightEye)
        ear = (leftEAR + rightEAR) / 2.0
        leftEyeHull = cv2.convexHull(leftEye)
        rightEyeHull = cv2.convexHull(rightEye)
        cv2.drawContours(frame, [leftEyeHull], -1, (0, 255, 0), 1)
        cv2.drawContours(frame, [rightEyeHull], -1, (0, 255, 0), 1)
        if ear < EYE_AR_THRESH:
            COUNTER += 1
            if COUNTER >= EYE_AR_CONSEC_FRAMES:
                if not ALARM_ON:
                    ALARM_ON = True
                    if args["alarm"] != "":
                        t = Thread(target=sound_alarm,
                            args=(args["alarm"],))
                        t.deamon = True
                        t.start()
                cv2.putText(frame, "DROWSINESS ALERT!", (10, 30),
                    cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)
        else:
            COUNTER = 0
            ALARM_ON = False
        cv2.putText(frame, "EAR: {:.2f}".format(ear), (300, 30),
            cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 255), 2)

    cv2.imshow("Frame", frame)
    key = cv2.waitKey(1) & 0xFF
    if key == ord("q"):
        break

cv2.destroyAllWindows()
vs.stop()

脚本运行正常，但出现以下问题：

1）根据触发条件（alarm.wav），没有警报声音。

2）执行此脚本时：

python detect_drowsiness.py --shape-predictor 
shape_predictor_68_face_landmarks.dat --alarm alarm.wav

我收到以下错误

Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\Mandeesh\AppData\Local\Programs\Python\Python37- 
   32\lib\threading.py", line 917, in _bootstrap_inner
        self.run()
  File "C:\Users\Mandeesh\AppData\Local\Programs\Python\Python37-
32\lib\threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "detect_drowsiness.py", line 18, in sound_alarm
    subprocess.call(["afplay",path])
   File "C:\Users\Mandeesh\AppData\Local\Programs\Python\Python37- 
   32\lib\subprocess.py", line 317, in call
    with Popen(*popenargs, **kwargs) as p:
  File "C:\Users\Mandeesh\AppData\Local\Programs\Python\Python37- 
   32\lib\subprocess.py", line 769, in __init__
    restore_signals, start_new_session)
  File "C:\Users\Mandeesh\AppData\Local\Programs\Python\Python37- 
   32\lib\subprocess.py", line 1172, in _execute_child
    startupinfo)
 FileNotFoundError: [WinError 2] The system cannot find the file specified

我对opencv和python完全陌生，并在朋友的项目中尝试了此脚本。任何人都可以帮助建议潜在的问题吗？

Answer 1

欢迎来到Stackoverflow！

发生此错误是因为您的脚本未将正确的文件路径传递给Bracket *l1 = new Bracket(next, position + 1); opening_brackets_stack.push(*l1);函数。

检查包含以下内容的行：

Bracket l1{next, position + 1};
opening_brackets_stack.push(l1);

如果您在使sound_alarm(path)正常工作时遇到麻烦，建议您先在单独的脚本中使用一个简单的函数来隔离问题，以测试警报是否响起。

您可以尝试：

                    if args["alarm"] != "":
                    t = Thread(target=sound_alarm,
                        args=(args["alarm"],))
                    t.deamon = True
                    t.start()

如果您在控制台行中打印了sound_alarm(path)和import subprocess path = r'C:\your_file_path_here' def sound_alarm(path): # play an alarm sound print ('entered function') subprocess.call(["afplay",path]) print ('ended function') sound_alarm(path)，但是仍然没有声音播放，这意味着entered function的声音在播放方式上存在问题。文件，这意味着调用该文件的代码是错误的，必须重新处理，否则该文件会出现问题。

Answer 2

感谢解决了这个问题。我试图在Windows上运行MACOS函数“ afplay”。使用“ playsound”修改了脚本，并且声音触发了！

谢谢。

OpenCV问题：FileNotFoundError：[WinError 2]系统找不到指定的文件

2 个答案: