将背景图像添加到具有已知角坐标的绘图中 [英] Adding a background image to a plot with known corner coordinates

问题描述

说我正在以图像为背景绘制一组点.我在示例中使用了 Lena 图片:

Say I am plotting a set of points with an image as a background. I've used the Lena image in the example:

import numpy as np
import matplotlib.pyplot as plt
from scipy.misc import imread

np.random.seed(0)
x = np.random.uniform(0.0,10.0,15)
y = np.random.uniform(0.0,10.0,15)
img = imread("lena.jpg")
plt.scatter(x,y,zorder=1)
plt.imshow(img,zorder=0)
plt.show()

这给了我.

我的问题是:如何指定绘图中图像的角坐标?假设我希望左下角位于x, y = 0.5, 1.0，右上角位于x, y = 8.0, 7.0.

My question is: How can I specify the corner coordinates of the image in the plot? Let's say I'd like the bottom-left corner to be at x, y = 0.5, 1.0 and the top-right corner to be at x, y = 8.0, 7.0.

推荐答案

使用imshow的extent关键字.参数的顺序为[left, right, bottom, top]

Use the extent keyword of imshow. The order of the argument is [left, right, bottom, top]

import numpy as np
import matplotlib.pyplot as plt
from scipy.misc import imread
import matplotlib.cbook as cbook

np.random.seed(0)
x = np.random.uniform(0.0,10.0,15)
y = np.random.uniform(0.0,10.0,15)

datafile = cbook.get_sample_data('lena.jpg')
img = imread(datafile)
plt.scatter(x,y,zorder=1)
plt.imshow(img, zorder=0, extent=[0.5, 8.0, 1.0, 7.0])
plt.show()

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