python数字化图片原理

原图：

from cv2 import imread
import numpy as np
from PIL import Image

# 读取一张图片为矩阵
a = imread('123.png')
print(len(a))
# 将图片中大于220的值转化为零
li1 = []
for i in a:
    li2 = []
    for j in i:
        j[0] = 0 if 220 <= j[0] <= 255 else j[0]
        j[1] = 0 if 220 <= j[1] <= 255 else j[1]
        j[2] = 0 if 220 <= j[2] <= 255 else j[2]
        # print(j)
        li2.append(list(j))
    li1.append(li2)
# print(li1)

# 将转化后的矩阵每行值转化为字符串，并写入到txt中
for s in li1:
    x1 = []
    for x in s:
        num = ' ' if x[0] + x[1] + x[2]>1 else 0
        x1.append(num)
    # print(x1)
    st = ''
    for c in x1:
        st += str(c)
    print(st)
    with open('123.txt', 'a+', encoding='utf-8') as f:
        f.write(st+'\n')
sz = np.array(li1)

# 显示第一次处理后的图片
new_im = Image.fromarray(sz)
new_im.save('123.jpg')

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