将背景图像添加到 matplotlib plot / gif

Question

我有一个任务会多次调用一个绘图并根据结果创建一个 gif（请参阅下面的可重现示例）。

我的问题是：我想为这个 gif 添加背景图片。我的猜测是，在附加之前，我必须在循环中的某个位置添加它。

到目前为止，我发现了什么，虽然很搞笑并与我的问题没有真正的关系：

Plotting a cropped background image on a matplotlib graph

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib.animation import PillowWriter
import time

rng = np.random.default_rng()
fig = plt.figure(figsize=[10, 9])

ims = []
for i in range(200):
    df = pd.DataFrame(rng.integers(0, 100, size=(100, 2)), columns=list('xy'))
    x = df["x"]
    y = df["y"]
    im = plt.plot(x, y, "b.")
    ims.append(im)
    print(i)
    
    
    

ani = animation.ArtistAnimation(fig, ims, interval=500, blit=True,
                                repeat_delay=1000)

writer = PillowWriter(fps=2)
ani.save("demo2.gif", writer=writer)

来源：

How to create a DataFrame of random integers with Pandas?

Answer 1

我对此没有太多经验，但我能够显示我事先用plt.imshow() 调用的图像。由于文件大小限制，无法上传 demo.gif。抱歉，示例中使用的图像不好。对不起。

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib.animation import PillowWriter
import time
import matplotlib.image as mpimg

rng = np.random.default_rng()
fig = plt.figure(figsize=[10, 9])

img = mpimg.imread('lena_thumbnail_center_square.jpg')

ims = []
for i in range(200):
    df = pd.DataFrame(rng.integers(0, 100, size=(100, 2)), columns=list('xy'))
    x = df["x"]
    y = df["y"]
    im = plt.plot(x, y, "b.")
    ims.append(im)
#     print(i)   

ani = animation.ArtistAnimation(fig, ims, interval=500, blit=True,
                                repeat_delay=1000)
plt.imshow(img)

writer = PillowWriter(fps=2)
ani.save("demo2.gif", writer=writer)