再也不怕别人动电脑了！用Python实时监控

前言

最近突然有个奇妙的想法，就是当我对着电脑屏幕的时候，电脑会先识别屏幕上的人脸是否是本人，如果识别是本人的话需要回答电脑说的暗语，答对了才会解锁并且有三次机会。如果都没答对就会发送邮件给我，通知有人在动我的电脑并上传该人头像。

过程

环境是win10代码我使用的是python3所以在开始之前需要安装一些依赖包，请按顺序安装否者会报错

pip install cmake -i https://pypi.tuna.tsinghua.edu.cn/simple

pip install dlib -i https://pypi.tuna.tsinghua.edu.cn/simple

pip install face_recognition -i https://pypi.tuna.tsinghua.edu.cn/simple

pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple

接下来是构建识别人脸以及对比人脸的代码

import face_recognition

import cv2

import numpy as np

video_capture = cv2.VideoCapture(0)

my_image = face_recognition.load_image_file("my.jpg")

my_face_encoding = face_recognition.face_encodings(my_image)[0]

known_face_encodings = [

my_face_encoding

]

known_face_names = [

"Admin"

]

face_names = []

face_locations = []

face_encodings = []

process_this_frame = True

while True:

ret, frame = video_capture.read()

small_frame = cv2.resize(frame, (0, 0), fx=0.25, fy=0.25)

rgb_small_frame = small_frame[:, :, ::-1]

if process_this_frame:

face_locations = face_recognition.face_locations(rgb_small_frame)

face_encodings = face_recognition.face_encodings(rgb_small_frame, face_locations)

face_names = []

for face_encoding in face_encodings:

matches = face_recognition.compare_faces(known_face_encodings, face_encoding)

name = "Unknown"

face_distances = face_recognition.face_distance(known_face_encodings, face_encoding)

best_match_index = np.argmin(face_distances)

if matches[best_match_index]:

name = known_face_names[best_match_index]

face_names.append(name)

process_this_frame = not process_this_frame

for (top, right, bottom, left), name in zip(face_locations, face_names):

top *= 4

left *= 4

right *= 4

bottom *= 4

font = cv2.FONT_HERSHEY_DUPLEX

cv2.rectangle(frame, (left, top), (right, bottom), (0, 0, 255), 2)

cv2.rectangle(frame, (left, bottom - 35), (right, bottom), (0, 0, 255), cv2.FILLED)

cv2.putText(frame, name, (left + 6, bottom - 6), font, 1.0, (255, 255, 255), 1)

cv2.imshow('Video', frame)

if cv2.waitKey(1) & 0xFF == ord('q'):

break

video_capture.release()

cv2.destroyAllWindows()

其中my.jpg需要你自己拍摄上传，运行可以发现在你脸上会出现Admin的框框，我去网上找了张图片类似这样子

识别功能已经完成了接下来就是语音识别和语音合成，这需要使用到百度AI来实现了，去登录百度AI的官网到控制台选择左边的语音技术，然后点击面板的创建应用按钮，来到创建应用界面

打造电脑版人脸屏幕解锁神器

创建后会得到AppID、API Key、Secret Key记下来，然后开始写语音合成的代码。安装百度AI提供的依赖包

pip install baidu-aip -i https://pypi.tuna.tsinghua.edu.cn/simple

pip install playsound -i https://pypi.tuna.tsinghua.edu.cn/simple

然后是简单的语音播放代码，运行下面代码可以听到萌妹子的声音

import sys

from aip import AipSpeech

from playsound import playsound

APP_ID = ''

API_KEY = ''

SECRET_KEY = ''

client = AipSpeech(APP_ID, API_KEY, SECRET_KEY)

result = client.synthesis('你好吖', 'zh', 1, {'vol': 5, 'per': 4, 'spd': 5, })

if not isinstance(result, dict):

with open('auido.mp3', 'wb') as file:

file.write(result)

filepath = eval(repr(sys.path[0]).replace('\\', '/')) + '//auido.mp3'

playsound(filepath)

有了上面的代码就完成了检测是否在电脑前（人脸识别）以及电脑念出暗语（语音合成）然后我们还需要回答暗号给电脑，所以还需要完成语音识别。

import wave

import pyaudio

from aip import AipSpeech

APP_ID = ''

API_KEY = ''

SECRET_KEY = ''

client = AipSpeech(APP_ID, API_KEY, SECRET_KEY)

CHUNK = 1024

FORMAT = pyaudio.paInt16

CHANNELS = 1

RATE = 8000

RECORD_SECONDS = 3

WAVE_OUTPUT_FILENAME = "output.wav"

p = pyaudio.PyAudio()

stream = p.open(format=FORMAT, channels=CHANNELS, rate=RATE, input=True, frames_per_buffer=CHUNK)

print("* recording")

frames = []

for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):

data = stream.read(CHUNK)

frames.append(data)

print("* done recording")

stream.stop_stream()

stream.close()

p.terminate()

wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')

wf.setnchannels(CHANNELS)

wf.setsampwidth(p.get_sample_size(FORMAT))

wf.setframerate(RATE)

wf.writeframes(b''.join(frames))

def get_file_content():

with open(WAVE_OUTPUT_FILENAME, 'rb') as fp:

return fp.read()

result = client.asr(get_file_content(), 'wav', 8000, {'dev_pid': 1537, })

print(result)

运行此代码之前需要安装pyaudio依赖包，由于在win10系统上安装会报错所以可以通过如下方式安装。到这个链接 https://www.lfd.uci.edu/~gohlke/pythonlibs/#pyaudio 去下载对应的安装包然后安装即可。

打造电脑版人脸屏幕解锁神器

运行后我说了你好，可以看到识别出来了。那么我们的小模块功能就都做好了接下来就是如何去整合它们。可以发现在人脸识别代码中if matches[best_match_index]这句判断代码就是判断是否为电脑主人，所以我们把这个判断语句当作main函数的入口。

if matches[best_match_index]:

# 在这里写识别到之后的功能

name = known_face_names[best_match_index]

那么识别到后我们应该让电脑发出询问暗号，也就是语音合成代码，然我们将它封装成一个函数，顺便重构下人脸识别的代码。

import cv2

import time

import numpy as np

import face_recognition

video_capture = cv2.VideoCapture(0)

my_image = face_recognition.load_image_file("my.jpg")

my_face_encoding = face_recognition.face_encodings(my_image)[0]

known_face_encodings = [

my_face_encoding

]

known_face_names = [

"Admin"

]

face_names = []

face_locations = []

face_encodings = []

process_this_frame = True

def speak(content):

import sys

from aip import AipSpeech

from playsound import playsound

APP_ID = ''

API_KEY = ''

SECRET_KEY = ''

client = AipSpeech(APP_ID, API_KEY, SECRET_KEY)

result = client.synthesis(content, 'zh', 1, {'vol': 5, 'per': 0, 'spd': 5, })

if not isinstance(result, dict):

with open('auido.mp3', 'wb') as file:

file.write(result)

filepath = eval(repr(sys.path[0]).replace('\\', '/')) + '//auido.mp3'

playsound(filepath)

try:

while True:

ret, frame = video_capture.read()

small_frame = cv2.resize(frame, (0, 0), fx=0.25, fy=0.25)

rgb_small_frame = small_frame[:, :, ::-1]

if process_this_frame:

face_locations = face_recognition.face_locations(rgb_small_frame)

face_encodings = face_recognition.face_encodings(rgb_small_frame, face_locations)

face_names = []

for face_encoding in face_encodings:

matches = face_recognition.compare_faces(known_face_encodings, face_encoding)

name = "Unknown"

face_distances = face_recognition.face_distance(known_face_encodings, face_encoding)

best_match_index = np.argmin(face_distances)

if matches[best_match_index]:

speak("识别到人脸，开始询问暗号，请回答接下来我说的问题")

time.sleep(1)

speak("天王盖地虎")

error = 1 / 0

name = known_face_names[best_match_index]

face_names.append(name)

process_this_frame = not process_this_frame

for (top, right, bottom, left), name in zip(face_locations, face_names):

top *= 4

left *= 4

right *= 4

bottom *= 4

font = cv2.FONT_HERSHEY_DUPLEX

cv2.rectangle(frame, (left, top), (right, bottom), (0, 0, 255), 2)

cv2.rectangle(frame, (left, bottom - 35), (right, bottom), (0, 0, 255), cv2.FILLED)

cv2.putText(frame, name, (left + 6, bottom - 6), font, 1.0, (255, 255, 255), 1)

cv2.imshow('Video', frame)

if cv2.waitKey(1) & 0xFF == ord('q'):

break

except Exception as e:

print(e)

finally:

video_capture.release()

cv2.destroyAllWindows()

这里有一点需要注意，由于playsound播放音乐的时候会一直占用这个资源，所以播放下一段音乐的时候会报错，解决方法是修改~\Python37\Lib\site-packages下的playsound.py文件，找到如下代码

打造电脑版人脸屏幕解锁神器

在sleep函数下面添加winCommand('close', alias)这句代码，保存下就可以了。运行发现可以正常将两句话都说出来。那么说出来之后就要去监听了，我们还要打包一个函数。

def record():

import wave

import json

import pyaudio

from aip import AipSpeech

APP_ID = ''

API_KEY = ''

SECRET_KEY = ''

client = AipSpeech(APP_ID, API_KEY, SECRET_KEY)

CHUNK = 1024

FORMAT = pyaudio.paInt16

CHANNELS = 1

RATE = 8000

RECORD_SECONDS = 3

WAVE_OUTPUT_FILENAME = "output.wav"

p = pyaudio.PyAudio()

stream = p.open(format=FORMAT, channels=CHANNELS, rate=RATE, input=True, frames_per_buffer=CHUNK)

print("* recording")

frames = []

for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):

data = stream.read(CHUNK)

frames.append(data)

print("* done recording")

stream.stop_stream()

stream.close()

p.terminate()

wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')

wf.setnchannels(CHANNELS)

wf.setsampwidth(p.get_sample_size(FORMAT))

wf.setframerate(RATE)

wf.writeframes(b''.join(frames))

def get_file_content():

with open(WAVE_OUTPUT_FILENAME, 'rb') as fp:

return fp.read()

result = client.asr(get_file_content(), 'wav', 8000, {'dev_pid': 1537, })

result = json.loads(str(result).replace("'", '"'))

return result["result"][0]

将识别到人脸后的代码修改成如下

if matches[best_match_index]:

speak("识别到人脸，开始询问暗号，请回答接下来我说的问题")

time.sleep(1)

speak("天王盖地虎")

flag = False

for times in range(0, 3):

content = record()

if "小鸡炖蘑菇" in content:

speak("暗号通过")

flag = True

break

else:

speak("暗号不通过，再试一次")

if flag:

print("解锁")

else:

print("发送邮件并将坏人人脸图片上传！")

error = 1 / 0

name = known_face_names[best_match_index]

运行看看效果，回答电脑小鸡炖蘑菇，电脑回答暗号通过。这样功能就基本上完成了。

打造电脑版人脸屏幕解锁神器

结语

至于发送邮件的功能和锁屏解锁的功能我就不一一去实现了，我想这应该难不倒在座的各位吧。锁屏功能可以HOOK让键盘时间无效化，然后用窗口再覆盖整个桌面即可