Python 使用 matplotlib 显示图像序列
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Display sequence of images using matplotlib
提问by Yash
I have this simple python script using OpenCV to load images from a folder and display them in a loop. I want to reproduce this effect using matplotlib.
我有这个简单的 python 脚本，使用 OpenCV 从文件夹加载图像并循环显示它们。我想使用matplotlib.
import cv2 as cv
import os
im_files = [for f in os.listdir('.') if f[-3:] == 'png']
for f in im_files:
im = cv.imread(f, 0) #read image in greyscale
cv.imshow('display', im)
cv.waitKey(1)
cv.destroyAllWindows()
I tried the following script but the pyplot window which opens to display the plots becomes un responsive.
我尝试了以下脚本，但打开以显示绘图的 pyplot 窗口变得没有响应。
import pylab as pl
import os
files = [f for f in os.listdir('.') if f[-3:] == 'png']
pl.ion()
for f in files:
im=pl.imread(f)
pl.imshow(im)
pl.draw()
I have googled a lot but couldn't find any solution. How do I go about doing this? I am using Anaconda 1.6 32bit on Windows 8.
我用谷歌搜索了很多，但找不到任何解决方案。我该怎么做？我在 Windows 8 上使用 Anaconda 1.6 32 位。
采纳答案by tacaswell
img = None
for f in files:
im=pl.imread(f)
if img is None:
img = pl.imshow(im)
else:
img.set_data(im)
pl.pause(.1)
pl.draw()
回答by Bily
I have implemented a handy script based on matplotlib that just suits your need and much more. Check it here
我已经实现了一个基于 matplotlib 的方便的脚本，它正好适合您的需要等等。在这里检查
In your case, the following snippet should work:
在您的情况下，以下代码段应该有效：
import os
from scipy.misc import imread
img_files = [for f in os.listdir('.') if f[-3:] == 'png']
# redraw_fn draw frame f in a image sequence
def redraw_fn(f, axes):
img_file = img_files[f]
img = imread(img_file)
if not redraw_fn.initialized:
redraw_fn.im = axes.imshow(img, animated=True)
redraw_fn.initialized = True
else:
redraw_fn.im.set_array(img)
redraw_fn.initialized = False
videofig(len(img_files), redraw_fn, play_fps=30)
回答by robertofbaycot
I like the following way of doing this which is really straight-forward and allows the whole figure to be updated, including title, labels etc. rather than just the image.
我喜欢以下这样做的方式，它非常简单，允许更新整个图形，包括标题、标签等，而不仅仅是图像。
import numpy as np
from matplotlib import pyplot as plt
for j in range(0,3):
img = np.random.normal(size=(100,150))
plt.figure(1); plt.clf()
plt.imshow(img)
plt.title('Number ' + str(j))
plt.pause(3)
A random image is formed.
形成随机图像。
plt.figurecreates the figure the first time round if it does not already exist, and thereafter just makes figure 1 the current figure.
plt.figure如果图形不存在，则第一次创建图形，此后仅将图形 1 设为当前图形。
plt.clfclears the figure so subsequent updates don't overlay each other. The image is then displayed with a title.
plt.clf清除数字，以便后续更新不会相互重叠。然后显示带有标题的图像。
The plt.pausestatement is the key, since this causes the display to be updated - including title, labels etc.
该plt.pause声明是关键，因为这将导致显示被更新-包括标题，标签等。
