在使用imread函数读取它们时,是否有任何可能的原因在opencv中的jpg文件有一些困难? [英] Is there any possible reason to have some difficulties with jpg files in opencv while using imread function to read them?
问题描述
正如我所知,当我想在python中导入 cv2 模块时,我需要将 cv2.so 文件路径添加到系统路径中:
sys.path.append '/path/to/cv.so')
当我想要读取jpg文件时, ipython笔记本,它失败:
import sys
import numpy as np
import os
sys.path.append(/ usr / local / lib1 / python2.7 / site-packages)
import cv2
im1 = cv2.imread('pic1.png')
打印im1.shape
#output :( 512,512,3)
im2 = cv2.imread('pic1.jpg')
打印im2.shape
#output:
----------------------------------------------- --------------------------
AttributeError追溯(最近的最后一次调用)
< ipython-input-8- 2d36ac00eca0>在< module>()
----> 1 print im2.shape
AttributeError:'NoneType'对象没有属性'shape'
基于我以前的问题,我重建了opencv几次。
我阅读了某处可能是一些依赖问题的结果。但是我的系统上有这两个软件包(libjpeg和libjaspe):
print cv2.getBuildInformation()
媒体I / O:
ZLib:/lib64/libz.so(ver 1.2.8)
JPEG:/lib64/libjpeg.so(ver 80)
WEBP:/ lib64 /libwebp.so(ver编码器:0x0202)
PNG:/lib64/libpng.so(ver 1.6.17)
TIFF:/lib64/libtiff.so(ver 42 - 4.0.2)
JPEG 2000:/lib64/libjasper.so(ver 1.900.1)
任何想法? / p>
经过很多努力,我意识到解决方案是添加:
PYTHONPATH =
export PYTHONPATH
PATH = / usr / bin:/ usr / local / bin
export PATH
在 /home/.bashrc 文件的末尾(使其永久),$ b运行 python 或 ipython笔记本之前$ b
注意:仅使用 opencv-python.x86_64 (根据您的机器架构)从yum(dnf)存储库(当然为fedora用户)和python 2.7 。
不要从其网站下载opencv。这有一些依赖性的麻烦,我猜。
Recently, I use opencv in python.
As I noticed, when I want to import cv2 module in python, I need to add cv2.so file path manually to the system paths using:
sys.path.append('/path/to/cv.so')
Howewer, when I want to read jpg files in the ipython notebooks, it fails:
import sys
import numpy as np
import os
sys.path.append("/usr/local/lib1/python2.7/site-packages")
import cv2
im1=cv2.imread('pic1.png')
print im1.shape
#output: (512, 512, 3)
im2=cv2.imread('pic1.jpg')
print im2.shape
#output:
-------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-8-2d36ac00eca0> in <module>()
----> 1 print im2.shape
AttributeError: 'NoneType' object has no attribute 'shape'
Based on my previous question, I rebuilt opencv several times.
I read somewhere that it might be the result of some dependency problems. But I have the both packages (libjpeg and libjaspe) on my system:
print cv2.getBuildInformation()
Media I/O:
ZLib: /lib64/libz.so (ver 1.2.8)
JPEG: /lib64/libjpeg.so (ver 80)
WEBP: /lib64/libwebp.so (ver encoder: 0x0202)
PNG: /lib64/libpng.so (ver 1.6.17)
TIFF: /lib64/libtiff.so (ver 42 - 4.0.2)
JPEG 2000: /lib64/libjasper.so (ver 1.900.1)
Any idea?
After lots of efforts, I realized that the solution is to add:
PYTHONPATH=""
export PYTHONPATH
PATH=/usr/bin:/usr/local/bin
export PATH
at the end of /home/.bashrc file (to make them permanent), before running python or ipython notebook from terminal.
Note: use only opencv-python.x86_64 (based on your machine architecture) from yum (dnf) repository (for fedora users of course!) and python 2.7.
DO NOT download opencv from its website. That makes some dependency troubles, I guess.
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