Generate QR code using Python

Mainly for Python3 beginner

By calling the MyQR interface, you can generate a personal QR code, and you can set the size of the QR code, whether to generate it based on existing pictures, and whether to generate a dynamic QR code.

Create environment

pip3 install MyQR

linux needs to download dependencies

http://labfile.oss.aliyuncs.com/courses/1126/libfreeimage-3.16.0-linux64.so

Ordinary QR code

from MyQR import myqr
myqr.run('https://www.baidu.com')

[external link image transfer failed. The source station may have an anti-theft chain mechanism. It is recommended to save the image and upload it directly (img-UF7ybJvI-1654176813977)(C:\Users\lcx\Desktop\qrcode.png)]

Let's explain myqr in detail Parameters in the run() function

parameter	meaning	detailed
words	QR code pointing link	str, enter a link or sentence as a parameter
version	Side length	int, control the side length. The range is 1 to 40. The larger the number, the larger the side length. The default side length depends on the length of the information you enter and the error correction level you use
level	Error correction level	str, which controls the error correction level. The range is L, M, Q, h, which increases from left to right. The default error correction level is' H '
picture	Combined picture	str, combine QR QR QR code image with a picture under the same directory to generate a black-and-white picture
colorized	colour	bool to change the generated picture from black and white to color
contrast	contrast ratio	float to adjust the contrast of the picture. 1.0 means the original picture. A smaller value means a lower contrast. A larger value means the opposite. Default = 1.0
brightness	brightness	float to adjust the brightness of the picture. Other usage and values are the same as those of contrast
save_name	Output file name	str, the default output file name is "qrcode.png"
save_dir	Storage location	str, the default storage location is the current directory

Art QR code with picture

myqr.run(words='https://www.shiyanlou.com',
         picture='1.jpg',
         save_name='artistic.png',
         )

[external link image transfer failed. The source station may have an anti-theft chain mechanism. It is recommended to save the image and upload it directly (img-yKBsZZgt-1654176813979)(C:\Users\lcx\Desktop\artistic1.png)]

myqr.run(words='https://www.baidu.com',
         picture='1.jpg',
         save_name='artistic.png',
         colorized=True,
         )

Art QR code with picture (True)

[external link image transfer failed. The source station may have an anti-theft chain mechanism. It is recommended to save the image and upload it directly (img-ok28t13T-1654176813980)(C:\Users\lcx\Desktop\artistic.png)]

Dynamic QR code

myqr.run(words='https://www.baidu.com',
         picture='gakki.gif',
         save_name='artistic.gif',
         colorized=True,
         )

[external link image transfer failed. The source station may have an anti-theft chain mechanism. It is recommended to save the image and upload it directly (img-IHK9NAMJ-1654176813981)(C:\Users\lcx\Desktop\artistic.gif)]

qrcode
│   LICENSE.md  
│   README.md    
│   requirements.txt    #Environment dependent file
|   myqr.py
|
└───MyQR
│   │   __init__.py
│   │   myqr.py     #Called file
│   │   terminal.py #Setting parameters
|   |
│   └───mylibs
│       │   __init__.pt
│       │   constant.py  #Data analysis
|       |   data.py     #Data coding
│       │   ECC.py      #Error correction codes 
|       |   structure.py    #data structure
|       |   matrix.py       #Get QR matrix
|       |   draw.py         #Generate QR code
|       |   theqrmodule.py  #Associative function
│   
└───example
    │   0.png
    │   1.png
    |   2.png
    |   ...

Data analysis myqr/mylibs/constant py

Data code: myqr/mylibs/data py

Error correction code myqr/mylibs/ecc py

Construct the final data information myqr/mylibs/structure py + matrix. py

Create a matrix of QR codes

# MyQR/mylibs/matrix.py
def get_qrmatrix(ver, ecl, bits):
    num = (ver - 1) * 4 + 21
    qrmatrix = [[None] * num for i in range(num)]
    # Add finder mode and add separator
    add_finder_and_separator(qrmatrix)

    # Add calibration mode
    add_alignment(ver, qrmatrix)

    # Add time mode
    add_timing(qrmatrix)
    
    # Add blackened modules and reserved areas
    add_dark_and_reserving(ver, qrmatrix)
    
    maskmatrix = [i[:] for i in qrmatrix]
    
    # Place data bits
    place_bits(bits, qrmatrix)
    
    # Mask operation
    mask_num, qrmatrix = mask(maskmatrix, qrmatrix)
    
    # Format information
    add_format_and_version_string(ver, ecl, mask_num, qrmatrix)

    return qrmatrix

Generate QR code myqr/mylibs/draw py

def draw_qrcode(abspath, qrmatrix):
    unit_len = 3
    x = y = 4*unit_len
    pic = Image.new('1', [(len(qrmatrix)+8)*unit_len]*2, 'white')   #Create a new white underlay
    
    '''
    The units in the circular matrix are enabled in the units that need to be blackened dra_a_black_unit()Functions are blackened.
    '''
    for line in qrmatrix:
        for module in line:
            if module:
                draw_a_black_unit(pic, x, y, unit_len)  #Draw black units
            x += unit_len
        x, y = 4*unit_len, y+unit_len

    saving = os.path.join(abspath, 'qrcode.png')
    pic.save(saving)    # Save QR code picture
    return saving

How to merge pictures

/MyQR/myqr. The combine() method in. Py calls the pilot Library

Read picture operation

    qr = Image.open(qr_name)    #Read QR code picture
    qr = qr.convert('RGBA') if colorized else qr    #Judge whether the QR code is colored
        
    bg0 = Image.open(bg_name).convert('RGBA')   #Read pictures to merge
    bg0 = ImageEnhance.Contrast(bg0).enhance(contrast)  # Adjust contrast
    bg0 = ImageEnhance.Brightness(bg0).enhance(brightness)  # Adjust brightness

Overwrite the original QR code picture with the newly added picture, generate a new picture and save it.

    for i in range(qr.size[0]-24):
        for j in range(qr.size[1]-24):
            if not ((i in (18,19,20)) or (j in (18,19,20)) or (i<24 and j<24) or (i<24 and j>qr.size[1]-49) or (i>qr.size[0]-49 and j<24) or ((i,j) in aligs) or (i%3==1 and j%3==1) or (bg0.getpixel((i,j))[3]==0)):
                qr.putpixel((i+12,j+12), bg.getpixel((i,j)))