[英]Matplotlib heatmap: Image rotated when heatmap plot over it
我正在嘗試在圖像上方繪制熱圖。 我做了什么:
import matplotlib.pyplot as plt
import numpy as np
import numpy.random
import urllib
#downloading an example image
urllib.urlretrieve("http://tekeye.biz/wp-content/uploads/2013/01/small_playing_cards.png", "/tmp/cards.png")
#reading and plotting the image
im = plt.imread('/tmp/cards.png')
implot = plt.imshow(im)
#generating random data for the histogram
x=numpy.random.normal(500, 100, size=1000)
y=numpy.random.normal(100, 50, size=1000)
heatmap, xedges, yedges = np.histogram2d(x, y, bins=50)
extent = [xedges[0], xedges[-1], yedges[0], yedges[-1]]
plt.imshow(heatmap, extent=extent,alpha=.5)
plt.show()
當我將它們繪制在一起時,圖像旋轉,上下顛倒,如下所示:
有沒有人有解決舊照片的解決方案?
您需要設置origin
雙方的imshow
實例。 但是,你也需要改變yedges
圍繞在你的extent
implot = plt.imshow(im,origin='upper')
...
extent = [xedges[0], xedges[-1], yedges[-1], yedges[0]]
plt.imshow(heatmap, extent=extent,alpha=.5,origin='upper')
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