I deal today with opencv and I fix some of my errors.
One is this error I got with cv2.VideoCapture. When I try to used with load video and createBackgroundSubtractorMOG2() i got this:
cv2.error:
C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\highgui\src\window.cpp:281:
error: (-215) size.width<0 amp="" cv::imshow="" function="" i="" in="" size.height="">0>
You need also to have opencv_ffmpeg310.dll and opencv_ffmpeg310_64.dll into your Windows C:\Windows\System32, this will help me to play videos.
Now make sure you have the opencv version 3.1.0 because opencv come with some changes over python.
C:\Python27\python
Python 2.7.8 (default, Jun 30 2014, 16:08:48) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>import cv2
>>>print cv2.__version__
3.1.0
You can take some infos from about opencv python module - cv2 with:
>>>cv2.getBuildInformation()
...
>>>cv2.getCPUTickCount()
...
>>>print cv2.getNumberOfCPUs()
...
>>>print cv2.ocl.haveOpenCL()
True
You can also see some error by disable OpenCL:
>>>cv2.ocl.setUseOpenCL(False)
>>>print cv2.ocl.useOpenCL()
False
Now will show you how to use webcam gray and color , and play one video:
webcam color
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
while(True):
ret, frame = cap.read()
cv2.imshow('frame',frame)
if 0xFF & cv2.waitKey(5) == 27:
break
cap.release()
cv2.destroyAllWindows()
webcam gray
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
while(True):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame',gray)
if 0xFF & cv2.waitKey(5) == 27:
break
cap.release()
cv2.destroyAllWindows()
play video
import cv2
from cv2 import *
capture = cv2.VideoCapture("avi_test_001.avi")
while True:
ret, img = capture.read()
cv2.imshow('some', img)
if 0xFF & cv2.waitKey(5) == 27:
break
cv2.destroyAllWindows()
Is a blog about python programming language. You can see my work with python programming language, tutorials and news.
Saturday, June 25, 2016
OpenGL and OpenCV with python 2.7 - part 002.
Posted by
Cătălin George Feștilă
Labels:
2.7,
2016,
cv2,
matplotlib,
numpy,
OpenCV,
opengl,
pyopengl,
python
Wednesday, June 22, 2016
OpenGL and OpenCV with python 2.7 - part 001.
First you need to know what version of python you use.
You need also to download the OpenCV version 3.0 from here.
Then run the executable into your folder and get cv2.pyd file from \opencv\build\python\2.7\x64 and paste to \Python27\Lib\site-packages.
If you use then use 32 bit python version then use this path: \opencv\build\python\2.7\x86.
Use pip to install next python modules:
Let's see how is working OpenGL:
You can also use dir(module) to see more. You can import all from GL, GLU and GLUT.
If you are very good with python OpenGL module then you can import just like this example:
Most of this OpenGL need to have a valid OpenGL rendering context.
For example you can test it with WGL ( WGL or Wiggle is an API between OpenGL and the windowing system interface of Microsoft Windows):
Now , let's see the OpenCV python module with s=one simple webcam python script:
C:\Python27>python
Python 2.7.8 (default, Jun 30 2014, 16:08:48) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
You need also to download the OpenCV version 3.0 from here.
Then run the executable into your folder and get cv2.pyd file from \opencv\build\python\2.7\x64 and paste to \Python27\Lib\site-packages.
If you use then use 32 bit python version then use this path: \opencv\build\python\2.7\x86.
Use pip to install next python modules:
C:\Python27\Scripts>pip install PyOpenGL
...
C:\Python27\Scripts>pip install numpy
...
C:\Python27\Scripts>pip install matplotlib
...
Let's see how is working OpenGL:
C:\Python27>python
Python 2.7.8 (default, Jun 30 2014, 16:08:48) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import OpenGL
>>> import numpy
>>> import matplotlib
>>> import cv2
>>> from OpenGL import *
>>> from numpy import *
>>> from matplotlib import *
>>> from cv2 import *
You can also use dir(module) to see more. You can import all from GL, GLU and GLUT.
>>> dir(OpenGL)
['ALLOW_NUMPY_SCALARS', 'ARRAY_SIZE_CHECKING', 'CONTEXT_CHECKING', 'ERROR_CHECKING', 'ERROR_LOGGING', 'ERROR_ON_COPY', 'FORWARD_COMPATIBLE_ONLY', 'FULL_LOGGING', 'FormatHandler', 'MODULE_ANNOTATIONS', 'PlatformPlugin', 'SIZE_1_ARRAY_UNPACK', 'STORE_POINTERS', 'UNSIGNED_BYTE_IMAGES_AS_STRING', 'USE_ACCELERATE', 'WARN_ON_FORMAT_UNAVAILABLE', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', '__version__', '_bi', 'environ_key', 'os', 'plugins', 'sys', 'version']
>>> from OpenGL.GL import *
>>> from OpenGL.GLU import *
>>> from OpenGL.GLUT import *
>>> from OpenGL.WGL import *
If you are very good with python OpenGL module then you can import just like this example:
>>> from OpenGL.arrays import ArrayDatatype
>>> from OpenGL.GL import (GL_ARRAY_BUFFER, GL_COLOR_BUFFER_BIT,
... GL_COMPILE_STATUS, GL_FALSE, GL_FLOAT, GL_FRAGMENT_SHADER,
... GL_LINK_STATUS, GL_RENDERER, GL_SHADING_LANGUAGE_VERSION,
... GL_STATIC_DRAW, GL_TRIANGLES, GL_TRUE, GL_VENDOR, GL_VERSION,
... GL_VERTEX_SHADER, glAttachShader, glBindBuffer, glBindVertexArray,
... glBufferData, glClear, glClearColor, glCompileShader,
... glCreateProgram, glCreateShader, glDeleteProgram,
... glDeleteShader, glDrawArrays, glEnableVertexAttribArray,
... glGenBuffers, glGenVertexArrays, glGetAttribLocation,
... glGetProgramInfoLog, glGetProgramiv, glGetShaderInfoLog,
... glGetShaderiv, glGetString, glGetUniformLocation, glLinkProgram,
... glShaderSource, glUseProgram, glVertexAttribPointer)
Most of this OpenGL need to have a valid OpenGL rendering context.
For example you can test it with WGL ( WGL or Wiggle is an API between OpenGL and the windowing system interface of Microsoft Windows):
>>> import OpenGL
>>> from OpenGL import *
>>> from OpenGL import WGL
>>> print WGL.wglGetCurrentDC()
None
Now , let's see the OpenCV python module with s=one simple webcam python script:
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
while(True):
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
This is result of my webcam:
Posted by
Cătălin George Feștilă
Labels:
2.7,
2016,
cv2,
matplotlib,
numpy,
OpenCV,
opengl,
pyopengl,
python
Tuesday, June 21, 2016
Scrapy python module - part 001.
To install pip under python 2.7.8, securely download get-pip.py into Python27 folder.
Use this command:
Some of python modules are installed:
Now you need to install win32api with this python module:
... and test scrapy bench:
Into the next tutorial I will try to use scrapy.
If you have some ideas about how to do the next step just send me one comment.
Use this command:
C:\Python27\python.exe get-pip.py
...
C:\Python27\Scripts>pip2.7.exe install urllib3
C:\Python27\Scripts>pip2.7 install requests
C:\Python27\Scripts>pip install Scrapy
Some of python modules are installed:
Successfully built PyDispatcher pycparser
Installing collected packages: cssselect, queuelib, six, enum34, ipaddress, idna, pycparser, cffi, pyasn1, cryptography, pyOpenSSL, w3lib, lxml, parsel, PyDispatcher, zope.interface, Twisted, attrs, pyasn1-modules, service-identity, Scrapy
Successfully installed PyDispatcher-2.0.5 Scrapy-1.1.0 Twisted-16.2.0 attrs-16.0.0 cffi-1.7.0 cryptography-1.4 cssselect-0.9.2 enum34-1.1.6 idna-2.1 ipaddress-1.0.16 lxml-3.6.0 parsel-1.0.2 pyOpenSSL-16.0.0 pyasn1-0.1.9 pyasn1-modules-0.0.8 pycparser-2.14 queuelib-1.4.2 service-identity-16.0.0 six-1.10.0 w3lib-1.14.2 zope.interface-4.2.0
>>> print scrapy.version_info
(1, 1, 0)
>>> help(scrapy)
PACKAGE CONTENTS
_monkeypatches
cmdline
command
commands (package)
conf
contracts (package)
contrib (package)
contrib_exp (package)
core (package)
crawler
downloadermiddlewares (package)
dupefilter
dupefilters
exceptions
exporters
extension
extensions (package)
http (package)
interfaces
item
link
linkextractor
linkextractors (package)
loader (package)
log
logformatter
mail
middleware
pipelines (package)
project
resolver
responsetypes
selector (package)
settings (package)
shell
signalmanager
signals
spider
spiderloader
spidermanager
spidermiddlewares (package)
spiders (package)
squeue
squeues
stats
statscol
statscollectors
telnet
utils (package)
xlib (package)
...
C:\Python27\c:\Python27\Scripts\scrapy.exe startproject test_scrapy
New Scrapy project 'test_scrapy', using template directory 'c:\\python27\\lib\\site-packages\\scrapy\\templates\\project', created in:
C:\Python27\test_scrapy
You can start your first spider with:
cd test_scrapy
scrapy genspider example example.com
C:\Python27\cd test_scrapy
C:\Python27\test_scrapy>tree
Folder PATH listing
Volume serial number is 9A67-3A80
C:.
└───test_scrapy
└───spiders
Now you need to install win32api with this python module:
pip install pypiwin32
...
Downloading pypiwin32-219-cp27-none-win_amd64.whl (7.3MB)
100% |################################| 7.3MB 61kB/s
Installing collected packages: pypiwin32
Successfully installed pypiwin32-219
... and test scrapy bench:
C:\Python27\Scripts\scrapy.exe bench
2016-06-21 22:45:20 [scrapy] INFO: Scrapy 1.1.0 started (bot: scrapybot)
2016-06-21 22:45:20 [scrapy] INFO: Overridden settings: {'CLOSESPIDER_TIMEOUT': 10, 'LOG_LEVEL': 'INFO', 'LOGSTATS_INTERVAL': 1}
2016-06-21 22:45:39 [scrapy] INFO: Enabled extensions:
['scrapy.extensions.closespider.CloseSpider',
'scrapy.extensions.logstats.LogStats',
'scrapy.extensions.telnet.TelnetConsole',
'scrapy.extensions.corestats.CoreStats']
2016-06-21 22:45:46 [scrapy] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
'scrapy.downloadermiddlewares.retry.RetryMiddleware',
'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
'scrapy.downloadermiddlewares.chunked.ChunkedTransferMiddleware',
'scrapy.downloadermiddlewares.stats.DownloaderStats']
2016-06-21 22:45:46 [scrapy] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
'scrapy.spidermiddlewares.referer.RefererMiddleware',
'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
'scrapy.spidermiddlewares.depth.DepthMiddleware']
2016-06-21 22:45:46 [scrapy] INFO: Enabled item pipelines:
[]
2016-06-21 22:45:46 [scrapy] INFO: Spider opened
2016-06-21 22:45:46 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:48 [scrapy] INFO: Crawled 27 pages (at 1620 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:49 [scrapy] INFO: Crawled 59 pages (at 1920 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:50 [scrapy] INFO: Crawled 85 pages (at 1560 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:51 [scrapy] INFO: Crawled 123 pages (at 2280 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:52 [scrapy] INFO: Crawled 149 pages (at 1560 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:53 [scrapy] INFO: Crawled 181 pages (at 1920 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:54 [scrapy] INFO: Crawled 211 pages (at 1800 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:55 [scrapy] INFO: Crawled 237 pages (at 1560 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:56 [scrapy] INFO: Crawled 269 pages (at 1920 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:57 [scrapy] INFO: Closing spider (closespider_timeout)
2016-06-21 22:45:57 [scrapy] INFO: Crawled 307 pages (at 2280 pages/min), scraped 0 items (at 0 items/min)
2016-06-21 22:45:57 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 97844,
'downloader/request_count': 317,
'downloader/request_method_count/GET': 317,
'downloader/response_bytes': 469955,
'downloader/response_count': 317,
'downloader/response_status_count/200': 317,
'dupefilter/filtered': 204,
'finish_reason': 'closespider_timeout',
'finish_time': datetime.datetime(2016, 6, 21, 19, 45, 57, 835000),
'log_count/INFO': 17,
'request_depth_max': 14,
'response_received_count': 317,
'scheduler/dequeued': 317,
'scheduler/dequeued/memory': 317,
'scheduler/enqueued': 6136,
'scheduler/enqueued/memory': 6136,
'start_time': datetime.datetime(2016, 6, 21, 19, 45, 46, 986000)}
2016-06-21 22:45:57 [scrapy] INFO: Spider closed (closespider_timeout)
Into the next tutorial I will try to use scrapy.
If you have some ideas about how to do the next step just send me one comment.
Posted by
Cătălin George Feștilă
Labels:
2.7,
module,
pip,
pip2.7,
python,
scrapy,
windows,
winodws 10
Thursday, May 19, 2016
News: The new python version 3.6.0.a1
I used the Windows x86-64 executable installer to install this version of python.
I set some settings and I start the install aplication.
I read all new changes and PEP 0498.
I take a look to see all python modules:
I don't think the add Python start well, maybe need restart:
You can read more and also download the new python released version 360a1 from here.
Very good work from development team, they make a great job.
I set some settings and I start the install aplication.
I read all new changes and PEP 0498.
I take a look to see all python modules:
Please wait a moment while I gather a list of all available modules...
__future__ aifc http setuptools
_ast antigravity idlelib shelve
_bisect argparse imaplib shlex
_bootlocale array imghdr shutil
_bz2 ast imp signal
_codecs asynchat importlib site
_codecs_cn asyncio inspect smtpd
_codecs_hk asyncore io smtplib
_codecs_iso2022 atexit ipaddress sndhdr
_codecs_jp audioop itertools socket
_codecs_kr base64 json socketserver
_codecs_tw bdb keyword sqlite3
_collections binascii lib2to3 sre_compile
_collections_abc binhex linecache sre_constants
_compat_pickle bisect locale sre_parse
_compression builtins logging ssl
_csv bz2 lzma stat
_ctypes cProfile macpath statistics
_ctypes_test calendar macurl2path string
_datetime cgi mailbox stringprep
_decimal cgitb mailcap struct
_dummy_thread chunk marshal subprocess
_elementtree cmath math sunau
_functools cmd mimetypes symbol
_hashlib code mmap symtable
_heapq codecs modulefinder sys
_imp codeop msilib sysconfig
_io collections msvcrt tabnanny
_json colorsys multiprocessing tarfile
_locale compileall netrc telnetlib
_lsprof concurrent nntplib tempfile
_lzma configparser nt test
_markupbase contextlib ntpath textwrap
_md5 copy nturl2path this
_msi copyreg numbers threading
_multibytecodec crypt opcode time
_multiprocessing csv operator timeit
_opcode ctypes optparse tkinter
_operator curses os token
_osx_support datetime parser tokenize
_overlapped dbm pathlib trace
_pickle decimal pdb traceback
_pydecimal difflib pickle tracemalloc
_pyio dis pickletools tty
_random distutils pip turtle
_sha1 doctest pipes turtledemo
_sha256 dummy_threading pkg_resources types
_sha512 easy_install pkgutil typing
_signal email platform unicodedata
_sitebuiltins encodings plistlib unittest
_socket ensurepip poplib urllib
_sqlite3 enum posixpath uu
_sre errno pprint uuid
_ssl faulthandler profile venv
_stat filecmp pstats warnings
_string fileinput pty wave
_strptime fnmatch py_compile weakref
_struct formatter pyclbr webbrowser
_symtable fractions pydoc winreg
_testbuffer ftplib pydoc_data winsound
_testcapi functools pyexpat wsgiref
_testimportmultiple gc queue xdrlib
_testmultiphase genericpath quopri xml
_thread getopt random xmlrpc
_threading_local getpass re xxsubtype
_tkinter gettext reprlib zipapp
_tracemalloc glob rlcompleter zipfile
_warnings gzip runpy zipimport
_weakref hashlib sched zlib
_weakrefset heapq secrets
_winapi hmac select
abc html selectors
The new formatted string literals are a new kind of string literal, prefixed with 'f' this allow you to add contain replacement fields surrounded by curly braces.I don't think the add Python start well, maybe need restart:
>>> import crypt
Traceback (most recent call last):
File "", line 1, in
File "C:\Python36\lib\crypt.py", line 3, in
import _crypt
ImportError: No module named '_crypt'
Some of changes can be see at whatsnew.You can read more and also download the new python released version 360a1 from here.
Very good work from development team, they make a great job.
Wednesday, April 20, 2016
News: New PyPy 5.1 released.
New features and bug fixes come with new PyPy 5.1 version.
The PyPy is a very compliant Python interpreter and supports x86 machines on most common operating systems.
Now we have full support for the IBM s390x and good optimizations.
Take a look here.
The PyPy is a very compliant Python interpreter and supports x86 machines on most common operating systems.
Now we have full support for the IBM s390x and good optimizations.
Take a look here.
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