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Re: OpenCV with Python (cv or cv2)

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Hi Laura,

On 26-05-2015 11:21, Laura Creighton wrote:
> In a message of Tue, 26 May 2015 10:24:30 -0300, Markos writes:
>    
>> Hi,
>>
>> I want to use OpenCV with Python.
>>
>> I installed version 2.4.9
>> (http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.9/opencv-2.4.9.zip/)
>> in debian Squeeze running Python 2.6.6. Using the tutorial:
>> http://indranilsinharoy.com/2012/11/01/installing-opencv-on-linux/
>>
>> (I tried to install versions 2.4.11 and 2.4.10 (in Squeeze with python
>> 2.2.6) but I couldn't.)
>>      
> You mean python 2.6.6, right?
> and this package: https://packages.debian.org/source/squeeze/opencv
> which is 2.1.0-3 is too old for you?
>
>    

I installed this package (python-opencv) but I thought this package 
would be only some API for python to use the opencv library and I 
imagined that I would still have to install the opencv library from source.

> What do you mean that you
> tried to install versions 2.4.11 and 2.4.10 but couldn't?  What
> error messages did you get?
>
>    
For example when trying to install the 2.4.11 version after running cmake:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D 
WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D 
INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON 
-D WITH_QT=ON -D WITH_OPENGL=ON ..

(Output of cmake at the end of message.)

and make -j2 to compile, but an error occurred after compiling 55%:

[ 55%] Building CXX object 
modules/legacy/CMakeFiles/opencv_legacy.dir/src/facedetection.cpp.o
Linking CXX shared library ../../lib/libopencv_legacy.so
[ 55%] Built target opencv_legacy
make: ** [all] Erro 2

>> I lost some time trying to load the module cv2:
>>
>>      
>>>>> Import cv2.cv the cv
>>>>>            
> s/the/as/ ?
>    

import cv2.cv as cv


>
>    
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in<module>>
>> ImportError: No module named cv2.cv
>>
>> After a while I realized I could use the cv module. (import cv)
>>
>> But still I do not understand the differences between the modules cv and
>> cv2.
>>
>> Do you suggest any good tutorial about the differences between cv and cv2?
>>
>> I will have to make many changes in python programs using cv to reuse
>> the code later with cv2?
>>
>> Thanks,
>> Markos
>> -- 
>> https://mail.python.org/mailman/listinfo/python-list
>>      
> post the output you got from cmake
>    

At the end of message.

> It will probably complain that it is missing some headers, so couldn't
> make libcv2.so
>
> If you haven't installed python-dev (not just python) and numpy I
> guarantee it will not find needed headers; if you have but it is
> still not being made we will have to look harder at what is going wrong.
>
>    
I installed the following packages:

apt-get install cmake
apt-get install build-essential
apt-get install pkg-config
apt-get install libgtk2.0-dev
apt-get install python-opencv python-dev python-numpy
apt-get install libpng12-0 libpng12-dev libpng++-dev libpng3 libpnglite-dev libpngwriter0-dev libpngwriter0c2 zlib1g-dbg
zlib1g zlib1g-dev pngtools libjasper-dev libjasper-runtime libjasper1 libjpeg8 libjpeg8-dbg libjpeg62 libjpeg62-dev 

libjpeg-progs libtiff4-dev libtiff4 libtiffxx0c2 libtiff-tools ffmpeg libavcodec-dev libavcodec52 libavformat52 

libavformat-dev libswscale0 libswscale-dev openexr libopenexr6 libopenexr-dev

apt-get install libgstreamer0.10-0-dbg libgstreamer0.10-0 libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev 

libxine1-ffmpeg libxine-dev libxine1-bin libunicap2 libunicap2-dev libucil2 libucil2-dev libdc1394-22-dev 

libdc1394-22 libdc1394-utils libv4l-0 libv4l-dev
apt-get install libqt4-dev

> If it made a libcv.so for you, did it put it in a place you can see
> with your PYTHONPATH?
>
> Laura
>
>
>    
 >>> import sys
 >>> print sys.path
['', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', 
'/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', 
'/usr/lib/python2.6/lib-dynload', 
'/usr/local/lib/python2.6/dist-packages', 
'/usr/lib/python2.6/dist-packages', 
'/usr/lib/python2.6/dist-packages/PIL', 
'/usr/lib/python2.6/dist-packages/gst-0.10', 
'/usr/lib/pymodules/python2.6', '/usr/lib/pymodules/python2.6/gtk-2.0', 
'/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode']

import cv works fine but I didn't find libcv.so in my system.

I suppose that cv had already been installed by the package 
python-opencv, and the compilation of the opencv didn't install cv2.

Thanks for your attention,
Markos


Return of cmake
--     Linker flags (Release):
--     Linker flags (Debug):
--     Precompiled headers:         YES
-- 
--   OpenCV modules:
--     To be built:                 core flann imgproc highgui 
features2d calib3d ml video legacy objdetect photo gpu ocl nonfree 
contrib stitching superres ts videostab
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 androidcamera dynamicuda java python viz
-- 
--   GUI:
--     QT 4.x:                      YES (ver 4.6.3 EDITION = OpenSource)
--     QT OpenGL support:           YES (/usr/lib/libQtOpenGL.so)
--     OpenGL support:              YES (/usr/lib/libGLU.so 
/usr/lib/libGL.so /usr/lib/libSM.so /usr/lib/libICE.so 
/usr/lib/libX11.so /usr/lib/libXext.so)
--     VTK support:                 NO
-- 
--   Media I/O:
--     ZLib:                        /usr/lib/libz.so (ver 1.2.3.4)
--     JPEG:                        /usr/lib/libjpeg.so (ver 62)
--     PNG:                         /usr/lib/libpng.so (ver 1.2.44)
--     TIFF:                        /usr/lib/libtiff.so (ver 42 - 3.9.4)
--     JPEG 2000:                   /usr/lib/libjasper.so (ver 1.900.1)
--     OpenEXR:                     /usr/lib/libImath.so 
/usr/lib/libIlmImf.so /usr/lib/libIex.so /usr/lib/libHalf.so 
/usr/lib/libIlmThread.so (ver 1.6.1)
-- 
--   Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  YES (ver 2.1.2)
--     FFMPEG:                      YES
--       codec:                     YES (ver 52.123.0)
--       format:                    YES (ver 52.111.0)
--       util:                      YES (ver 50.43.0)
--       swscale:                   YES (ver 0.14.1)
--       gentoo-style:              YES
--     GStreamer:
--       base:                      YES (ver 0.10.30)
--       video:                     YES (ver 0.10.30)
--       app:                       YES (ver 0.10.30)
--       riff:                      YES (ver 0.10.30)
--       pbutils:                   YES (ver 0.10.30)
--     OpenNI:                      NO
--     OpenNI PrimeSensor Modules:  NO
--     PvAPI:                       NO
--     GigEVisionSDK:               NO
--     UniCap:                      NO
--     UniCap ucil:                 NO
--     V4L/V4L2:                    Using libv4l1 (ver 0.8.0) / libv4l2 
(ver 0.8.0)
--     XIMEA:                       NO
--     Xine:                        NO
-- 
--   Other third-party libraries:
--     Use IPP:                     NO
--     Use Eigen:                   NO
--     Use TBB:                     NO
--     Use OpenMP:                  NO
--     Use GCD                      NO
--     Use Concurrency              NO
--     Use C=:                      NO
--     Use Cuda:                    NO
--     Use OpenCL:                  YES
-- 
--   OpenCL:
--     Version:                     dynamic
--     Include path:                
~/Programacao/Python/OpenCV/opencv-2.4.11/3rdparty/include/opencl/1.2
--     Use AMD FFT:                 NO
--     Use AMD BLAS:                NO
-- 
--   Python:
--     Interpreter:                 /usr/bin/python2.6 (ver 2.6.6)
--     Libraries:                   NO
--     numpy:                       
/usr/lib/pymodules/python2.6/numpy/core/include (ver 1.4.1)
--     packages path:               lib/python2.6/dist-packages
-- 
--   Java:
--     ant:                         NO
--     JNI:                         /usr/lib/jvm/java-6-sun/include 
/usr/lib/jvm/java-6-sun/include/linux /usr/lib/jvm/java-6-sun/include
--     Java tests:                  NO
-- 
--   Documentation:
--     Build Documentation:         NO
--     Sphinx:                      NO
--     PdfLaTeX compiler:           /usr/bin/pdflatex
--     Doxygen:                     NO
-- 
--   Tests and samples:
--     Tests:                       YES
--     Performance tests:           YES
--     C/C++ Examples:              YES
-- 
--   Install path:                  /usr/local
-- 
--   cvconfig.h is in:              
~/Programacao/Python/OpenCV/opencv-2.4.11/build
-- -----------------------------------------------------------------
-- 
-- Configuring done
-- Generating done
-- Build files have been written to: 
~/Programacao/Python/OpenCV/opencv-2.4.11/build

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Re: OpenCV with Python (cv or cv2) Markos <markos@c2o.pro.br> - 2015-05-27 19:56 -0300

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