Does not building against OpenCV 4.6

[OtacilioNeto]

DBoW2 does not build against OpenCV 4.6. Probably is broken with any version of OpenCV >= 4.

ota@rigel:/usr/local/src/DBoW2/build$ make
[ 0%] Built target Dependencies
[ 11%] Building CXX object CMakeFiles/DBoW2.dir/src/BowVector.cpp.o
[ 22%] Building CXX object CMakeFiles/DBoW2.dir/src/FBrief.cpp.o
In file included from /usr/local/include/DVision/DVision.h:42,
from /usr/local/src/DBoW2/DBoW2-1.1-free/src/FBrief.cpp:14:
/usr/local/include/DVision/BRIEF256.h: In member function ‘void DVision::BRIEF_t::compute(const cv::Mat&, const std::vectorcv::KeyPoint&, std::vector<std::bitset >&, bool) const’:
/usr/local/include/DVision/BRIEF256.h:207:11: error: ‘cvtColor’ is not a member of ‘cv’
207 | cv::cvtColor(image, aux, cv::COLOR_RGB2GRAY);
| ^~~~~~~~
/usr/local/include/DVision/BRIEF256.h:207:36: error: ‘COLOR_RGB2GRAY’ is not a member of ‘cv’
207 | cv::cvtColor(image, aux, cv::COLOR_RGB2GRAY);
| ^~~~~~~~~~~~~~
/usr/local/include/DVision/BRIEF256.h:214:9: error: ‘GaussianBlur’ is not a member of ‘cv’
214 | cv::GaussianBlur(aux, im, ksize, sigma, sigma);
| ^~~~~~~~~~~~
/usr/local/include/DVision/BRIEF256.h: In member function ‘void DVision::BRIEF_t::generateTestPoints()’:
/usr/local/include/DVision/BRIEF256.h:276:3: error: ‘DUtils’ has not been declared
276 | DUtils::Random::SeedRandOnce();
| ^~~~~~
/usr/local/include/DVision/BRIEF256.h:284:12: error: ‘DUtils’ has not been declared
284 | x1 = DUtils::Random::RandomGaussianValue(g_mean, g_sigma);
| ^~~~~~
/usr/local/include/DVision/BRIEF256.h:289:12: error: ‘DUtils’ has not been declared
289 | y1 = DUtils::Random::RandomGaussianValue(g_mean, g_sigma);
| ^~~~~~
/usr/local/include/DVision/BRIEF256.h:303:12: error: ‘DUtils’ has not been declared
303 | x2 = DUtils::Random::RandomGaussianValue(meanx, sigma2);
| ^~~~~~
/usr/local/include/DVision/BRIEF256.h:308:12: error: ‘DUtils’ has not been declared
308 | y2 = DUtils::Random::RandomGaussianValue(meany, sigma2);
| ^~~~~~
In file included from /usr/local/src/DBoW2/DBoW2-1.1-free/src/FBrief.cpp:15:
/usr/local/src/DBoW2/DBoW2-1.1-free/include/DBoW2/FBrief.h: At global scope:
/usr/local/src/DBoW2/DBoW2-1.1-free/include/DBoW2/FBrief.h:27:20: error: ‘BRIEF’ in namespace ‘DVision’ does not name a type; did you mean ‘BRIEF_t’?
27 | typedef DVision::BRIEF::bitset TDescriptor;

[chetanpandey1266]

Yeah I also thinks so. I am trying to build it with opencv 4.4 and it is failing

[dingshuoshuo]

in usr/local/include/DVision/BRIEF256.h add #include <DUtils/DUtils.h>, you can slove "error: ‘DUtils’ has not been declared".

[dingshuoshuo]

I met the same error "/usr/local/src/DBoW2/DBoW2-1.1-free/include/DBoW2/FBrief.h:27:20: error: ‘BRIEF’ in namespace ‘DVision’ does not name a type; did you mean ‘BRIEF_t’?
27 | typedef DVision::BRIEF::bitset TDescriptor;", have you solved this problem?