Toy example using opencv 3.0 object in a custom class

asked 2016-04-19 11:54:36 -0600

mcExchange
26 ●1 ●5

updated 2016-04-19 12:10:29 -0600

I'm new to opencv 3.0. I cannot figure out how to use a SVM object in a custom class. Can someone give me a toy example how to do it?

Here is an example for opencv 2.4.x:

// Class Definition    
class myClass{
    public:
        myClass();

    private:
        CvSVM svm;
};

// Constructor
myClass::myClass()
{
    myClass::svm.load("Some/hard/coded/path/to/a/SVM/File");
}

I guess the class definition should look similar to this:

class myClass {
    private:
    static cv::Ptr<cv::ml::SVM> svm;
};

But my Constructor keeps on failing:

myClass::myClass(){
    myClass::svm->load("Some/hard/coded/path/to/a/SVM/File");
}

with the following error message:

error: no matching function for call to 'cv::ml::SVM::load(const char [120])'

answered 2016-04-19 12:14:06 -0600

berak
32993 ●7 ●81 ●312

updated 2016-04-19 12:16:21 -0600

for opencv3, try like this:

(Algorithm::load is a static template function nowadays, it returns a new instance)

// Class Definition    
class myClass{
    public:
        myClass();

    int predict(const Mat &query) const;

    private:
        Ptr<ml::SVM> svm;
};

// Constructor
myClass::myClass()
{
    svm = Algorithm::load<ml::SVM>load("Some/hard/coded/path/to/a/SVM/File");
}

int myClass::predict(const Mat &query) const
{
    return (int)svm->predict(query);
}

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Comments

sidenote: 3.0 has a couple of warts wrt. machine-learning. you probably should update to current master (3.1, atm.)

berak ( 2016-04-19 12:19:32 -0600 )edit

I'm not sure entirely whether it's 3.0 or 3.1 I'm dealing with, since I'm doing surgery in the code of somebody else, but it's clearly not 2.4.x.

mcExchange ( 2016-04-19 12:24:24 -0600 )edit

cerr << cv::getBuildInformation(); will help you to find out.

berak ( 2016-04-19 12:30:16 -0600 )edit

I guess it's kind of fine thanks! I still get some error while compiling, but that might be due to some missing linked library: error: undefined reference to 'cv::ml::SVM::create()'

mcExchange ( 2016-04-19 13:24:05 -0600 )edit

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