Realization of Python Intelligent Bank Card Recognition System

Posted by daddymac on Wed, 14 Aug 2019 12:37:21 +0200

Part I

jacky's consistent idea is to learn not from the surface, but from the essence. Technology is always philosophy.

The video demo of this article is as follows:

https://v.qq.com/x/page/v0890lmkjfo.html

(1) Evolution history of PyQt5

To clarify what PyQt5 is, let's first briefly talk about what Qt is.

1. What is Qt?

First, what is Qt abstractly?

Qt is a cross-platform C++ graphical user interface application development framework. Qt can support desktop application development, embedded development and mobile development at the same time, covering all the mainstream platforms. In 1991, it was developed by Norwegian Funny Technologies; this Norwegian Funny Technologies, jacky said a few more words, this company also has many famous products, such as KDE, Autodesk Maya, WPS, YY voice, VirtualBox, Opera browser, excellent flying car, which is one of the most popular desktop environments on Linux operating system. Blizzard Warfare Network Clients and so on, in a word, very Niu X.
And Qt's development purpose, jacky is preferred: "Code Less; Create More; Deploy Anywhere"

2. What is the QT Designer?

Programmers usually have two ways to make UI interfaces. They use UI tools and pure code to write UI interfaces, such as Android and iOS in mobile development. In PyQt5, we also have two ways.

Qt Desinger is a tool specially used to make UI interface of Qt program. It is very simple to use. It can complete complex interface design by dragging and clicking, and can preview the effect map at any time.

3. What is PyQt5?

PyQt is a cross-platform toolkit for creating GUI applications, which integrates Python and Qt libraries. That is to say, PyQt allows API s in Qt libraries to be invoked using Python language. The greatest advantage of this method is that while retaining the high operating efficiency of Qt, it greatly improves the development efficiency. Because it is much faster to develop programs in Python than in C++. PyQt encapsulates Qt completely and can do almost anything Qt can do with PyQt.
Since the latest version of PyQt is 5.11, it is customary to become PyQt as PyQt 5.
Here's a question to explain: Is PyQt good or QT good?
- In fact, the friends who pay attention to this question may really want to know the answer, but this question is actually a false proposition. Rather than PyQT or QT, you are more familiar with C++ start or Python development. To be familiar with C++ is to use QT, and to be familiar with Python is to use PyQt.

(2) Development of PyQt5 Desktop GUI

This part of jacky stole a lazy, reproduce an article of a netizen, I think it's very good to share with you.

http://blog.sina.com.cn/s/blog_989218ad0102wz1k.html

First look at the effect:

Yes, the students who have studied C# should be familiar with this interface. The style of buttons is very similar to that of the interface. Unexpectedly, python can also make such an interface.

2.1 Installation of python

Why do we say this? Let's open pip, search: PyQt5, or open the following connection directly:

https://pypi.python.org/pypi/PyQt5/5.9.1

As you can see, the python version supported by PyQt5 started with 3.5, which is very important.

Find a python version 3.5 or more to install:

https://www.python.org/downloads/windows/

2.2 Install PyQt5

pip installation is recommended:

pip3 install PyQt5

Wait a moment and continue to install PyQt5-tools

pip install PyQt5-tools

2.3 Configuration of pycharm

Download and install pycharm: https://www.jetbrains.com/pycharm/

1. Click: File-"Settings

2. Tools - "External Tools -" Click on "+"
(ps: Here is my configuration. Your software is not very normal yet. Keep looking down.)

3. Setting up Qt Designer
Modify three places by default:

Name: Qt Designer
Programs: D:Program FilesPython35Libsite-packagespyqt5-toolsdesigner.exe
Working directory: $ ProjectFileDir$

(ps: Programs parameters need to be modified to the "designer.exe" path inside your computer)

4. Configuring PyUIC
Set up four places, others can default (I don't know how to change, then default)

Name: PyUIC
Programs: D:Program FilesPython35python.exe
Parameters: -m PyQt5.uic.pyuic $FileName$ -o $FileNameWithoutExtension$.py
Working directory: $ ProjectFileDir$

(ps: Programs parameters need to be modified to the python "python.exe" path inside your computer)

2.4 Use Qt Designer

1. After completing the above steps, click Tools-"External Tools-" Qt Designer to start our Qt Designer

2. Select after startup: Widget, create a blank window, click Create, other defaults will do.

3. Drag from area 1 on the left. Note that the drag control goes to area 2. Modify the corresponding attributes in area 3, much like that of vs.

4. After the basic interface settings last night, you will see that a'.ui'file was generated in the same directory.

5. Right-click External Tools - "PyUIC" to convert ".ui" file to ".py" file

6. At this time, if everything is normal and there is no error, the corresponding ".py" file will be generated in the same directory.

7. Put the following code into the generated'.py'file and put it at the end (note the indentation)

if __name__=="__main__":
    import sys
    from PyQt5.QtGui import QIcon
    app=QtWidgets.QApplication(sys.argv)
    widget=QtWidgets.QWidget()
    ui=Ui_Form()
    ui.setupUi(widget)
    widget.setWindowIcon(QIcon('web.png'))#Add icon icon, if there is no picture, you can not have this sentence
    widget.show()
    sys.exit(app.exec_())

8. Start up. Okay, congratulations. Open the python GUI

(3) Implementation of a landing system

3.1 Previous Supplement

For the above I reprinted the content of netizens, jacky here add a few points:

When we download PyQt5, we recommend using Douban Source (what is Douban Source can see my previous article)

pip install -i https://pypi.douban.com/simple/ PyQt5
pip install -i https://pypi.douban.com/simple/ PyQt5-tools

We can also see the following information about advanced learning

PyQt5 Course http://code.py40.com/pyqt5/

3.2 Realization of Python Intelligent Bank Card Recognition System-Login Function

Complete code

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'login.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(380, 245)
        self.widget = QtWidgets.QWidget(Form)
        self.widget.setGeometry(QtCore.QRect(50, 30, 291, 165))
        self.widget.setObjectName("widget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.widget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(self.widget)
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.lineEdit = QtWidgets.QLineEdit(self.widget)
        self.lineEdit.setObjectName("lineEdit")
        self.verticalLayout.addWidget(self.lineEdit)
        self.label_2 = QtWidgets.QLabel(self.widget)
        self.label_2.setObjectName("label_2")
        self.verticalLayout.addWidget(self.label_2)
        self.lineEdit_2 = QtWidgets.QLineEdit(self.widget)
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.verticalLayout.addWidget(self.lineEdit_2)
        self.pushButton = QtWidgets.QPushButton(self.widget)
        self.pushButton.setObjectName("pushButton")
        self.verticalLayout.addWidget(self.pushButton)
        self.pushButton_2 = QtWidgets.QPushButton(self.widget)
        self.pushButton_2.setObjectName("pushButton_2")
        self.verticalLayout.addWidget(self.pushButton_2)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Intelligent Bank Card Recognition System v1.0 login"))
        self.label.setText(_translate("Form", "User name:"))
        self.label_2.setText(_translate("Form", "Password:"))
        self.pushButton.setText(_translate("Form", "Sign in"))
        self.pushButton_2.setText(_translate("Form", "Sign out"))

        # Logon button
        self.pushButton.clicked.connect(self.onclick)
        #Exit button
        self.pushButton_2.clicked.connect(quit)


    def onclick(self):
        if self.lineEdit.text() == 'jacky':
            if self.lineEdit_2.text() == '666666':
                MainWindow.close(widget)
            else:
                self.lineEdit_2.setText('Password error please re-enter')
        else:
            self.lineEdit.setText('User error please re-enter')


if __name__=="__main__":
    import sys
    from PyQt5.QtGui import QIcon
    app=QtWidgets.QApplication(sys.argv)
    MainWindow=QtWidgets.QMainWindow
    widget=QtWidgets.QWidget()
    ui=Ui_Form()
    ui.setupUi(widget)
    #widget.setWindowIcon(QIcon('web.png'))#Add icon icon, if there is no picture, you can not have this sentence
    widget.show()
    sys.exit(app.exec_())

Part II

This article is suitable for all levels of Python learners, including AI enthusiasts and technology enthusiasts to learn. Admittedly, AI is a knowledge system with profound mathematical logic, including machine learning, search problems, knowledge representation and so on. This article, strictly forbidden to say, we simply invoked Baidu AI's results, jacky hopes to give you an inspiration through this article, after all, theory is theory, practice, money is money, so on.

This video demo is as follows (due to environmental constraints, this demo video is silent, later jacky in Gitchat, Aliyun and tremble will have live sharing, please pay attention to):
Video demo link

(1) Look at the effect of the system first.

(2) General idea of system realization