Opencv learning (II) -- installing opencv on raspberry pie

reason

Found the old raspberry pie , Bought a camera , See if you can do the same ubuntu Do face recognition like that , After all, considering the convenience of use . You can't use a computer to make a product .

Front face recognition with single chip microcomputer , It's quite simple , But for accuracy , It may still be relatively poor , You can fool me with a picture , You may need to add some infrared to identify the human body , But with that , Why do you have to use a face photo as a key , Use a complex photo , Would it be better , Just don't let others know what photos you use , Feel safer than your face , After all, the face is always exposed . It feels better to use a QR code .

Installation method

Don't talk much , Or how to install it on raspberry pie opencv-python Well .
The system is installed by official tools , Not here .
Refer to the A stray cat -《 Super simple to teach you how to install... On raspberry pie opencv（ Two ）》
However, it was not installed in his way opencv, It can also be used , It was installed in a few minutes .
But I don't know if there will be any lack of libraries , Follow up findings are being solved

So let's get started

Replace source

wget -qO- https://tech.biko.pub/resource/rpi-replace-apt-source-buster.sh | sudo bash

Upgrade software

sudo apt-get update
sudo apt-get upgrade

Installation Library

sudo apt-get install libatlas-base-dev
sudo apt-get install libjasper-dev
sudo apt-get install aptitude
sudo aptitude install libqtgui4
sudo apt-get install python3-pyqt5
sudo aptitude install libqt4-test

Note that some hints are not errors , Don't care

install opencv And upgrade numpy

sudo pip3 install opencv-python
pip3 install -U numpy

Other configuration

Turn on the camera

perform

sudo raspi-config

choice 3 Interface Options
And then camera and ssh open ,ssh Opening is convenient for transferring files .

Upload test files

I use it here. winscp Upload a previous test script , Test face recognition and camera

#!/usr/bin/python3
# -*- coding: utf-8 -*-
 
# 1. Import library 
import  cv2

# 2. Load face model 
faceModel = cv2.CascadeClassifier('/usr/local/lib/python3.9/dist-packages/cv2/data/haarcascade_frontalface_default.xml')

# 3. Turn on the camera 
capture = cv2.VideoCapture(0)
 
# 4. Get the real-time picture of the camera 
while True:
    #4.1 Read the picture of each frame 
    ret,image = capture.read()
 
    #4.2 Grayscale processing 
    gray = cv2.cvtColor(image,cv2.COLOR_RGB2GRAY)
 
    #4.3 Check the face 
    # faces = faceModel.detectMultiScale(gray,1.1,3,0)
    faces = faceModel.detectMultiScale(
        gray,
        scaleFactor=1.15,
        minNeighbors=5,
        minSize=(5, 5),
        # flags=cv2.cv.CV_HAAR_SCALE_IMAGE
    )
    print(" Find out {0} Personal face !".format(len(faces)))
 
    #4.4 Mark the face 
    for(x,y,w,h) in faces:
        # 1. Original picture  2. Face coordinate origin  3. Height of marker  4, Line color  5, Line width 
        cv2.rectangle(image,(x,y),(x+w,y+h),(0,255,0),2)
 
    #4.5 display picture 
    cv2.imshow(' Face recognition camera ',image)
 
    #4.6 Pause window 
    if cv2.waitKey(5) & 0xFF == ord('q'):
        break
 
# 5. Release resources 
capture.release()
 
# 6. Destruction of the window 
cv2.destroyAllWindows()

effect

Unexpectedly, the master of dream was photographed so indistinctly .

The disadvantages of face recognition

At the beginning, we used face recognition to bring convenience and security , Later, someone used face recognition to kill people , Installed cameras in shopping malls , You can tell whether you are a first-time visitor or a regular visitor , So as to output pertinently .

Users who have done face recognition entry know , The acquiree needs to blink 、 Turn around 、 Open your mouth and other actions to cooperate with the collection “ Living information ”.
“ What kind of activation process is used for a picture , Ordinary people can make photos shake their heads 、 Blink .” Laodongyan, a professor of Law School of Tsinghua University, is right 《 China consumer daily 》 The reporters ,“ The level of software technology is relatively low .”

The human face is the most exposed biometric fingerprint , I feel that it is not suitable to use it as a security means to protect some important information .
Some people are good at forging , Some people try to solve it , Increase living judgment , Update algorithms and other technologies , But the feeling is always passive defense , It is difficult to treat symptoms in time .

Someone has begun to cheat AI 了 ,《 How to prevent face recognition ？》
Fawkes This tool can upload your photos , No machine learning . Download address

Conclusion

Yesterday, I read several college entrance examination Chinese questions ,

See what's going on ？

Put these questions together , The purpose is too obvious , The state wants our students , It has a solid foundation , And have the spirit of daring to innovate . Learn your own skills first , Learn how to do it again , Although there are Pavilion wings , But not just drunk .

The key is coming. ！

The most gratifying thing for me is , This topic in Beijing , I was right ,

Look at my previous blog and you know , I have always emphasized that learning cannot be stopped ！

Although it is a little late to understand , But still hope , People who see , Can keep a learning heart .
At least it has been affirmed by the government .