如何在Python中使用cv2显示图像 [英] How can one display an image using cv2 in Python

问题描述

我一直在使用代码来显示电影中的帧.代码的基本内容如下:

I've been working with code to display frames from a movie. The bare bones of the code is as follows:

import cv2
import matplotlib.pyplot as plt

# Read single frame avi
cap = cv2.VideoCapture('singleFrame.avi')
rval, frame = cap.read()

# Attempt to display using cv2 (doesn't work)
cv2.namedWindow("Input")
cv2.imshow("Input", frame)

#Display image using matplotlib (Works)
b,g,r = cv2.split(frame)
frame_rgb = cv2.merge((r,g,b))
plt.imshow(frame_rgb)
plt.title('Matplotlib') #Give this plot a title, 
                        #so I know it's from matplotlib and not cv2
plt.show()

因为我可以使用matplotlib显示图像，所以我知道我已经成功读取了图像.

Because I can display the image using matplotlib, I know that I'm successfully reading it in.

我不明白为什么我创建窗口并尝试使用cv2显示图像不起作用.从未出现过cv2窗口.奇怪的是，如果我创建第二个cv2窗口，则会出现输入"窗口，但它只是一个空白/白色窗口.

I don't understand why my creation of a window and attempt to show an image using cv2 doesn't work. No cv2 window ever appears. Oddly though, if I create a second cv2 window, the 'input' window appears, but it is only a blank/white window.

我在这里想念什么?

推荐答案

据我所知，您做的差不多.缺少一件事:

As far as I can see, you are doing it almost good. There is one thing missing:

cv2.imshow('image',img)
cv2.waitKey(0)

所以您的窗口可能出现了，但是很快关闭了.

So probably your window appears but is closed very very fast.

这篇关于如何在Python中使用cv2显示图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！