COLOR2GRAY PYTHON UNDEFINED HOW TO
COLOR2GRAY PYTHON UNDEFINED CODE

With a clean build, libboost_python-3.so should not contain a reference to P圜lass_Type. Additionally, the libboost_python-3noclean.so contains a reference to P圜lass_Type as it was built with libboost_python-2.so's object files. $ nm -D stage/lib/libboost_python-3.so | grep P圜lass_TypeĪs expected, libboost_python-2.so references the P圜lass_Type symbol. $ nm -D stage/lib/libboost_python-3noclean.so | grep P圜lass_Type $ nm -D stage/lib/libboost_python-2.so | grep P圜lass_Type b2 -with-python -buildid=3 # produces libboost_python-3.so b2 -with-python -buildid=3noclean # produces libboost_python-3noclean.so bootstrap.sh -with-python=/usr/bin/python3 -with-python-root=/usr b2 -with-python -buildid=2 # produces libboost_python-2.so bootstrap.sh -with-python=/usr/bin/python2 Regardless, verify a clean build of Boost.Python with Python3. The exact procedure used to produce libboost_python3.so is not presented, so I can only speculate a non clean build, such as building Boost.Python with Python2, then reconfiguring bootstrap with Python3, and then building Boost.Python with the Python2 object files. However, it is being loaded by a Python 3 interpreter, where the P圜lass_Type is not available. Implementation of color-to-grayscale image conversion algorithms proposed in the following papers: spcr.py implements 'Color2Gray: Salience-Preserving Color Removal. This new Python instance does have the scope to access your main script. No substitution happened in the codeBlock string. Everything in codeBlock is sent together.

COLOR2GRAY PYTHON UNDEFINED HOW TO

Everything is packaged up and sent, somewhat blindly, to a new Python interpreter (not totally sure how to explain this). Hence, the Boost.Python library was likely built against Python 2. Line 14 is where all the previous lines come together. It is a basic tool in digital printing, stylized black-and-white photograph rendering, and in many single channel image processing applications 161. P圜lass_Type is is part of the Python 2 C API and not part of the Python 3 C API. Transforms a color image to a grayscale image. I also saw the page when the same error happens but it didn't help me. The question is: How to make the boost library compatible with Python 3? There are no problems with python2. ImportError: /usr/local/lib/libboost_python3.so.1.56.0: undefined symbol: P圜lass_Type

I receive an error Traceback (most recent call last):

COLOR2GRAY PYTHON UNDEFINED CODE

If you use the im2gray function, code like this conditional statement is no longer necessary. The im2gray function is identical to rgb2gray except that it can accept grayscale images as inputs, returning them unmodified. When I try to import the library to python script script.py with content: import hello The rgb2gray function returns an error if the input image is a grayscale image. bootstrap.sh -prefix=/usr/localĪs an output, we get a shared library hello.so.

bootstrap.sh -with-python-version=3.4 -prefix=/usr/local I installed boost libraries from the source described here, but it does not allow me to use the boost-python3 library (have an error in Cmake). Set_target_properties( hello PROPERTIES PREFIX '' OUTPUT_NAME hello) # don't prepend wrapper library name with lib Here is a CmakeList.txt: set(Python_ADDITIONAL_VERSIONS 3.4) I'm trying to create a helloWorld module for Python 3 in C++ using the boost::python library.

Color2gray python undefined