using this code, I am able to get the matched points, but I want to display the feature points without including the matched points. what modifications should the code need? Please someone help, Thank You.

function s=surfMatchesExample(str,name,st,en) matches_arr=[];

    for num_images=st:en-1
        disp(['Processing frame:',num2str(num_images),' and ',num2str(num_images+1)]);
        path1=[str,'\',name,'_',num2str(num_images),'.bmp'];
        path2=[str,'\',name,'_',num2str(num_images+1),'.bmp'];
        I1=imread(path1);
        I2=imread(path2);
        img_arr1=rgb2gray(I1);
        img_arr2=rgb2gray(I2);
        f1= detectSURFFeatures(img_arr1);
        f2= detectSURFFeatures(img_arr2);
        h=length(f1);
        g=length(f2);
        disp(['No. of matching features in block ',num2str(num_images),'=',num2str(h)]);

        disp(['No. of matching features in block ',num2str(num_images+1),'=',num2str(g)]);
        [features1,  validf1]  = extractFeatures(img_arr1,  f1);
       [features2, validf2] = extractFeatures(img_arr2, f2);
        %strongestPoints = validf1.selectStrongest(1000);
        %no_of_features1=length(strongestPoints);

        %disp(['No. of matching features in block ',num2str(num_images),'=',num2str(no_of_features1)]);
        indexPairs = matchFeatures(features1, features2);
        matchedIm1  = validf1(indexPairs(:,1),:);
        matchedIm2 = validf2(indexPairs(:,2),:);
       % matchedIm3 = validf2(indexPairs(:,3),:);

        no_of_matchedPts=length(indexPairs);
        %[features3, validf3] = extractFeatures(indexPairs,1);
       % m3 = matchFeatures(features3, features2);
        %m4=length(m3);

        disp(['No. of matching features in block ',num2str(num_images),',',num2str(num_images+1),'=',num2str(no_of_matchedPts)]); 
        %disp(num2str(m4));
        %[tform, inlierf1, inlierf2] = estimateGeometricTransform(matchedIm1, matchedIm2, 'affine');
        figure;
        showMatchedFeatures(I1,I2, matchedIm1, matchedIm2,'montage'); 
        %g=length(h);
        %disp(['No. of matching features in block ','=',g]);
    end
end

Answer 1

[Dima Lisin]

Do you mean that you want to display the detected points before matching? If so, than you can do the following:

f1= detectSURFFeatures(img_arr1);
figure
imshow(img_arr1);
plot(f1);

[Sourav Das]

First of all Thank you for answering. But my question is that how can i get the unmatched points/features of the two frames? Please help

[Dima Lisin]

Thank you for clarifying. In that case, you should use logical indexing:

indexPairs = matchFeatures(features1, features2);

% create a logical index where all features are selected
unmatchedIdx1 = true(1, size(features1, 1)); 

% "de-select" the matched features
unmatchedIdx1(indexPairs(:, 1)) = false;

% get unmatched descriptors
unmatchedFeatures1 = features1(unmatchedIdx1, :);

You would need to do the same for features2. To get the point locations of the unmatched features, you would need to apply the logical index to f1 and f2.

[Sourav Das]

Thank you so much

[chandrakant kavad]

i dont get can u tell me mr sourav das how u do that?