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// ¸ù¾ÝÀÍÊÏËã·¨£¨Lowe's algorithm£©£¬µÃµ½ÓÅÐãµÄÆ¥Åäµã
                vector<DMatch> goodMatches;
                for(unsigned int i = 0; i < matches.size(); i++)
                {
                        if(matches[0].distance < 0.6 * matches[1].distance)
                                goodMatches.push_back(matches[0]);
                }
matches[0]Õâ¸öµØ·½³ö´í£¬ÊÇÔõô»ØÊ°¡£¿

//ʹÓÃradiusmatch
std::vector< DMatch > good_matches;
for( int i = 0; i < descriptors1.rows; i++ )
        {
                if( matches.distance < 3*min_dist )
                {
                        good_matches.push_back(matches);
                }
        }
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