图像由opencv加载错误

作者: 誓言你好
发布时间: 2025-01-05 01:34:14 (2天前)
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回复此人
部落用户 | 2019-08-31 10-32

<div class =“post-text”itemprop =“text”> 好吧帮我们做到了 所以我尝试了另一个版本的显示： <pre> <code> plt.figure("Correct") plt.imshow(imutils.opencv2matplotlib(a)) plt.show() </code> </pre> <a href="https://i.stack.imgur.com/A0Jh8.png" rel="nofollow noreferrer"> <img src =“https://i.stack.imgur.com/A0Jh8.png”alt =“在此处输入图片说明”/> </A> 没有运气会出现。但是，查看opencv2matplotlib源代码，我们发现： <pre> <code> def opencv2matplotlib(image): # OpenCV represents images in BGR order; however, Matplotlib # expects the image in RGB order, so simply convert from BGR # to RGB and return return cv2.cvtColor(image, cv2.COLOR_BGR2RGB) </code> </pre> 啊哈，但我们有4通道颜色（alpha），所以按常识我们需要cv2.COLOR_BGRA2RGBA而不是cv2.COLOR_BGR2RGB !! 测试这个理论： <pre> <code> plt.figure("Correct") plt.imshow(cv2.cvtColor(a, cv2.COLOR_BGRA2RGBA)) plt.show() </code> </pre> 我们得到...... <a href="https://i.stack.imgur.com/AIpev.png" rel="nofollow noreferrer"> <img src =“https://i.stack.imgur.com/AIpev.png”alt =“在此处输入图片说明”/> </A> 呐喊！ </DIV>

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1#
回复此人
妖邪 | 2019-08-31 10-32

<div class =“post-text”itemprop =“text”> <pre> <code> # import the necessary packages import numpy as np import urllib import cv2 def url_to_image(url): # download the image, convert it to a NumPy array, and then read # it into OpenCV format resp = urllib.request.urlopen(url) image = np.asarray(bytearray(resp.read()), dtype="uint8") image = cv2.imdecode(image, cv2.IMREAD_COLOR) # return the image return image # initialize the list of image URLs to download url="http://i.dailymail.co.uk/i/pix/2015/09/01/18/2BE1E88B00000578-3218613-image-m-5_1441127035222.jpg" print ("downloading %s" % (url)) image = url_to_image(url) cv2.imshow("Image", image) cv2.waitKey(0) </code> </pre> 输出是： <a href="https://i.stack.imgur.com/n4C0V.png" rel="nofollow noreferrer"> <img src =“https://i.stack.imgur.com/n4C0V.png”alt =“显示从给定网址获取的图片”/> </A> </DIV>

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