Yiyi's profile - activity

Can you give me an sample or example of coding on how to do it?I does not know to manually labeling features.Thanks in advanced.

I means how to write the code to label the the features.

Can i know how to write the code for step3?Thanks.

I am developing an android image recognition application and I had used SURF algorithm as detector and descriptor.There are many matchers like flannbased, bruteforce_hamming, bruteforce_hamminglut, bruteforce_sl2 and bruteforce_l1.Can I know which matcher is best for SURF.

@Rui Marques,any problem for my code?Can you tell me so that at least I can understand where my mistake?

i had attach my code as above

I had extract and describe the keypoint for image from database and image of photo that i take from camera.After that,I try using the cross-check filter and find the maximum match.But the result not accurate

how to write the code for ratio test?

Can i know if i want use SURF algorithm for doing logo recognition?How can i verify the the image that i take using camera and the image from database?

I am doing a logo recognition application using the SURF algorithm.Can I know after I extract and describe the keypoints,how can I match the two images to see whether they are match or not?And i want to compare the image that take from camera with the images from database.

DescriptorMatcher flannmatcher1=DescriptorMatcher.create(DescriptorMatcher.FLANNBASED);
    DescriptorMatcher flannmatcher2=DescriptorMatcher.create(DescriptorMatcher.FLANNBASED);
    DescriptorMatcher flannmatcher3=DescriptorMatcher.create(DescriptorMatcher.FLANNBASED);
    DescriptorMatcher flannmatcher4=DescriptorMatcher.create(DescriptorMatcher.FLANNBASED);

    Vector<DMatch> matches1= new Vector<DMatch>();
    Vector<DMatch> matches2 = new Vector<DMatch>();
    Vector<DMatch> matches3 = new Vector<DMatch>();


    Vector<DMatch> matches4= new Vector<DMatch>();
    Vector<DMatch> matches5 = new Vector<DMatch>();
    Vector<DMatch> matches6 = new Vector<DMatch>();

    Vector<DMatch> matches7 = new Vector<DMatch>();
    Vector<DMatch> matches8= new Vector<DMatch>();
    Vector<DMatch> matches9 = new Vector<DMatch>();

    Vector<DMatch> matches10= new Vector<DMatch>();
    Vector<DMatch> matches11 = new Vector<DMatch>();
    Vector<DMatch> matches12= new Vector<DMatch>();

   Mat descriptor=image that take from camera;
    Mat descriptor1=my 1st image from database;
    Mat descriptor2=my 2nd image from database;
    Mat descriptor3=my 3rd image from database;
    Mat descriptor4=my 4th image from database;


    flannmatcher1.match(descriptor,descriptor1, matches1);
    flannmatcher1.match(descriptor1,descriptor, matches2);
    flannmatcher2.match(descriptor,descriptor2, matches4);
    flannmatcher2.match(descriptor2,descriptor, matches5);
    flannmatcher3.match(descriptor,descriptor3, matches7);
    flannmatcher3.match(descriptor3,descriptor, matches8);
    flannmatcher4.match(descriptor,descriptor4, matches10);
    flannmatcher4.match(descriptor4,descriptor, matches11);





    for( int i = 0; i < matches1.size(); i++ )
    { 
        DMatch forward = matches1.get(i); 
        DMatch backward = matches2.get(forward.trainIdx); 
        if( backward.trainIdx == forward.queryIdx ) 
            matches3.add( forward ); 
    }

    for( int i = 0; i < matches4.size(); i++ )
    { 
        DMatch forward = matches4.get(i); 
        DMatch backward = matches5.get(forward.trainIdx); 
        if( backward.trainIdx == forward.queryIdx ) 
            matches6.add( forward ); 
    }
    for( int i = 0; i < matches7.size(); i++ )
    { 
        DMatch forward = matches7.get(i); 
        DMatch backward = matches8.get(forward.trainIdx); 
        if( backward.trainIdx == forward.queryIdx ) 
            matches9.add( forward ); 
    }

    for( int i = 0; i < matches10.size(); i++ )
    { 
        DMatch forward = matches10.get(i); 
        DMatch backward = matches11.get(forward.trainIdx); 
        if( backward.trainIdx == forward.queryIdx ) 
            matches12.add( forward ); 
    }

then i use matches.size() to get the number of matches and then compare them to see which one has the more matches.