更改二维数组默认 .txt 格式

Question

默认值 = 每行 37 个值

[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 1 1 0 0 0

想要的 = 2D 数组高度和 len 以类似于图像，作为文本。

为什么 = 使下一个处理步骤更容易想象。

解决方案没有在帮助中跳出来给我（np.array，np.reshape，np.array2string，np.set_printoptions）。

array2string (max_line_width =None)
    max_line_width : int, optional
        Inserts newlines if text is longer than `max_line_width`.

set_printoptions (linewidth=None)
        linewidth : int, optional
        The number of characters per line for the purpose of inserting
        line breaks (default 75).    

  
import cv2, os, sys, numpy as np
os.chdir("D:/ ")
img1 = cv2.imread("line-drawing.jpg", cv2.IMREAD_REDUCED_GRAYSCALE_8)
img = 255-img1
np.set_printoptions(threshold=sys.maxsize)
for i in img:
    print(np.array2string(i) + '\n')

    x = len(i)
    i.reshape(x,1)
    print(np.array2string(i))
    1/0 #stop loop

编辑：

澄清问题：如何消除每行限制 37 vals？目标是使数组在视觉上类似于图像，如文本

Answer 1

如果您需要将灰度 0-255 图像可视化为文本，那么您可以尝试 np.array2string 函数： https://numpy.org/doc/stable/reference/generated/numpy.array2string.html

您可能需要指定threshold、max_line_width、seperator 和formatter 参数。

例子：

import cv2
import numpy as np

image = np.zeros((40, 40), np.uint8)
cv2.circle(image, (20, 20), 10, color=100, thickness=-1)
cv2.circle(image, (20, 20), 5, color=255, thickness=-1)

print(np.array2string(image, separator='', threshold=np.inf, max_line_width=np.inf, formatter={'int': lambda x: f'{x:03}'}))

结果：

[[  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0100  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100100100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100255100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0100100100100100100255255255255255255255100100100100100100  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0100100100100100255255255255255255255255255100100100100100  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0100100100100100255255255255255255255255255100100100100100  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0100100100100100255255255255255255255255255100100100100100  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0100100100100100255255255255255255255255255255255100100100100100  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0100100100100100255255255255255255255255255100100100100100  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0100100100100100255255255255255255255255255100100100100100  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0100100100100100255255255255255255255255255100100100100100  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0100100100100100100255255255255255255255100100100100100100  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100255100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100100100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0100100100100100100100100100  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0100  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]
 [  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0]]