使用数据框进行排序和绘制值

Question

我从调查中得到一组坐标/点击。我想创建一个这些点击的热图，但带有背景图片。

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
from PIL import Image

#import the excel file 
file = 'pidxyemo.xlsx'
xl = pd.ExcelFile(file)
df1 = xl.parse('Sheet1')
df2 = df1[np.isfinite(df1['X'])]
numpyMatrix = df2.as_matrix() #<---I have my data points here 

#the image I would like to use as background
img = Image.open("C:\\Users\\Judita\\Desktop\\body.png")

#I saw that someone used the following to make a heat map 
"""
x = np.random.randn(88)
y = np.random.randn(88)

heatmap, xedges, yedges = np.histogram2d(x, y, bins=50)
extent = [xedges[0], xedges[-1], yedges[0], yedges[-1]]


plt.imshow(heatmap.T, extent=extent, origin='lower')
plt.show()
"""

当我这样做时，我有两个单独的图像，而不是背景上的imgae，热图叠加在图像上。

制作热图时有没有办法拍摄背景图片？我是新来的和编程，请说如果我需要解释更多。

谢谢！