如何在我的 python 项目中添加蜂鸣器？ [复制]

Posted 2023-03-16

【中文标题】如何在我的 python 项目中添加蜂鸣器？ [复制]

【英文标题】：How to add a buzzer to my python project? [duplicate]

【发布时间】：2021-12-24 13:09:50

【问题描述】：

借助 youtube 上的在线教程，我使用机器学习制作了一个口罩检测程序。我已经制作了这个程序，它运行良好，但我想添加一个蜂鸣器，当这个人实际上没有戴口罩时会发出哔哔声。我希望蜂鸣器通过实际扬声器发出嗡嗡声。这是检测代码：

from tensorflow.keras.applications.mobilenet_v2 import preprocess_input
from tensorflow.keras.preprocessing.image import img_to_array
from tensorflow.keras.models import load_model
from imutils.video import VideoStream
import numpy as np
import imutils
import time
import cv2
import os

def detect_and_predict_mask(frame, faceNet, maskNet):
(h, w) = frame.shape[:2]
blob = cv2.dnn.blobFromImage(frame, 1.0, (224, 224),
    (104.0, 177.0, 123.0))
faceNet.setInput(blob)
detections = faceNet.forward()
print(detections.shape)
faces = []
locs = []
preds = []
for i in range(0, detections.shape[2]):
    confidence = detections[0, 0, i, 2]
    if confidence > 0.5:
        box = detections[0, 0, i, 3:7] * np.array([w, h, w, h])
        (startX, startY, endX, endY) = box.astype("int")
        (startX, startY) = (max(0, startX), max(0, startY))
        (endX, endY) = (min(w - 1, endX), min(h - 1, endY))
        face = frame[startY:endY, startX:endX]
        face = cv2.cvtColor(face, cv2.COLOR_BGR2RGB)
        face = cv2.resize(face, (224, 224))
        face = img_to_array(face)
        face = preprocess_input(face)
        faces.append(face)
        locs.append((startX, startY, endX, endY))
if len(faces) > 0:
    faces = np.array(faces, dtype="float32")
    preds = maskNet.predict(faces, batch_size=32)
return (locs, preds)


prototxtPath = r"face_detector\deploy.prototxt"
weightsPath = r"face_detector\res10_300x300_ssd_iter_140000.caffemodel"
faceNet = cv2.dnn.readNet(prototxtPath, weightsPath)
maskNet = load_model("mask_detector.model")
print("[INFO] starting video stream...")
vs = VideoStream(src=0).start()
while True:
frame = vs.read()
frame = imutils.resize(frame, width=400)
(locs, preds) = detect_and_predict_mask(frame, faceNet, maskNet)
for (box, pred) in zip(locs, preds):
(startX, startY, endX, endY) = box
(mask, withoutMask) = pred
label = "Mask" if mask > withoutMask else "No Mask"
color = (0, 255, 0) if label == "Mask" else (0, 0, 255)
label = ": :.2f%".format(label, max(mask, withoutMask) * 100)
cv2.putText(frame, label, (startX, startY - 10),
cv2.FONT_HERSHEY_SIMPLEX, 0.45, color, 2)
cv2.rectangle(frame, (startX, startY), (endX, endY), color, 2)

cv2.imshow("Frame", frame)
key = cv2.waitKey(1) & 0xFF

if key == ord("q"):
    break
cv2.destroyAllWindows()
vs.stop()

【问题讨论】：

到目前为止你尝试了什么？

【参考方案1】：

在 Windows 上，您可以使用 winsound 模块：

import winsound
winsound.Beep(frequency_in_hz, duration_in_ms)

在 Linux 上，您应该可以通过打印 \a 来做到这一点

print('\a')