cv::ml not compiling in opencv 3.0

asked 2015-08-06 15:57:27 -0600

tpacker
16 ●1 ●4

I downloaded, built, and installed OpenCV 3.0.0 on Ubuntu 14.10, 64-bit. I have a C++ project in NetBeans that compiles, links, and runs. I am now trying to follow the tutorial here: http://docs.opencv.org/3.0-beta/doc/t...

I have the "#includes" and the "using namespaces" as specified in the tutorial, and NetBeans and g++ both seem able to find these things. But when I add some ml-specific code such as "SVM::Params params;", I get compiler errors, below.

g++ -std=c++11   -c -g -I/usr/local/include -I/usr/include/libxml2/ -I/usr/local/include/opencv2 -MMD -MP -MF "build/Debug/GNU-Linux-x86/my_file.o.d" -o build/Debug/GNU-Linux-x86/my_file.o my_file.cpp
my_file.cpp: In function ‘void mynamespace::myFunction()’:
my_file.cpp:153:3: error: ‘Params’ is not a member of ‘cv::ml::SVM’
   SVM::Params params;
   ^

What might I be missing?

answered 2015-08-06 16:33:32 -0600

LorenaGdL
2026 ●2 ●13 ●33

updated 2015-08-06 17:20:22 -0600

There are no more SVM::Params in OpenCV 3.0.0. The structure of the ml module is now different (look here). You will need to use the new setters and getters to configure your parameters.

For example:

//In OpenCV 2.4.x
SVM::Params params;
params.C = 0.01;

//In OpenCV 3.0.0
Ptr<SVM> my_svm = SVM::create();
my_svm->setC(0.01);

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Comments

Thanks. That is a step in the right direction. When I add your second pair of lines, I get the following error:

sploit_page_classifier.cpp:152:28: error: cannot allocate an object of abstract type ‘cv::ml::SVM’
SVM my_svm = SVM::create();
                        ^

tpacker ( 2015-08-06 17:03:45 -0600 )edit

Sorry, I had a typo

LorenaGdL ( 2015-08-06 17:20:47 -0600 )edit

Thanks. That works. g++ now compiles and it runs. NetBeans still says "Unable to resolve identifier SVM." for some reason, but that may be a NetBeans-specific error.

By the way, was I looking at the wrong documentation/tutorial, or should that one be updated as you illustrate above?

tpacker ( 2015-08-06 17:42:52 -0600 )edit

You can found the new tutorial here.

LorenaGdL ( 2015-08-06 18:01:01 -0600 )edit

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