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@Mathieu Barnachon i procced like this

MatOfDMatch matches, matches12, matches21; matcher.match( descriptors1, descriptors2, matches12 ); matcher.match( descriptors2, descriptors1, matches21 ); // iterate matches12 DMatch forward = matches12[i]; // error convert from c++ to java DMatch backward = matches21[forward.trainIdx]; if( backward.trainIdx == forward.queryIdx ) matches.push_back( forward ); // error convert from c++ to java get the good matches then draw it Features2d.drawMatches( mGraySubmat, mKeyPoints,img1, keypoints, matches, mIntermediateMat2,GREEN, RED, MATCH_MASK, Features2d.NOT_DRAW_SINGLE_POINTS);

@Mathieu Barnachon i procced like this

 MatOfDMatch matches, matches12, matches21;
matcher.match( descriptors1, descriptors2, matches12 );
matcher.match( descriptors2, descriptors1, matches21 );
// iterate matches12
DMatch forward = matches12[i]; // error convert from c++ to java
DMatch backward = matches21[forward.trainIdx];
if( backward.trainIdx == forward.queryIdx )
matches.push_back( forward ); // error convert from c++ to java
get the good matches then draw it
Features2d.drawMatches( mGraySubmat, mKeyPoints,img1, keypoints, matches, mIntermediateMat2,GREEN, RED, MATCH_MASK, Features2d.NOT_DRAW_SINGLE_POINTS);
Features2d.NOT_DRAW_SINGLE_POINTS);