OpenCV iOS-显示从drawMatches返回的图像
我是OpenCV的新手。 我正在尝试在iOS上使用OpenCV中的FLANN/SURF在图像之间绘制功能匹配。 我遵循这个例子: 下面是我的代码,稍作修改(将示例中的代码包装在一个函数中,该函数返回一个UIImage作为结果,并从bundle读取起始图像):OpenCV iOS-显示从drawMatches返回的图像,opencv,computer-vision,feature-detection,surf,flann,Opencv,Computer Vision,Feature Detection,Surf,Flann,我是OpenCV的新手。 我正在尝试在iOS上使用OpenCV中的FLANN/SURF在图像之间绘制功能匹配。 我遵循这个例子: 下面是我的代码,稍作修改(将示例中的代码包装在一个函数中,该函数返回一个UIImage作为结果,并从bundle读取起始图像): UIImage*SURFRecognition::test() { UIImage*img1=[UIImage ImageName:@“钱包”]; UIImage*img2=[UIImage ImageName:@“wallet2”];
UIImage*SURFRecognition::test()
{
UIImage*img1=[UIImage ImageName:@“钱包”];
UIImage*img2=[UIImage ImageName:@“wallet2”];
Mat img_1;
matimg_2;
UIImageToMat(img1,img_1);
UIImageToMat(img2,img_2);
如果(!img_1.data | |!img_2.data)
{
标准::cout max_dist)max_dist=dist;
}
printf(“--Max dist:%f\n”,Max\u dist);
printf(“--最小距离:%f\n”,最小距离);
//--仅绘制“良好”匹配(即距离小于2*min\u dist)
//--PS.-radiusMatch也可以在此处使用。
标准::矢量良好匹配;
对于(int i=0;i {if(matches[i].distance我自己找到了答案。
看起来,在搜索了很多之后,drawMatches需要img1和img2具有1到3个通道。
下面是我的代码:
增加
太好了!这对我帮助很大!
UIImage* SURFRecognition::test()
{
UIImage *img1 = [UIImage imageNamed:@"wallet"];
UIImage *img2 = [UIImage imageNamed:@"wallet2"];
Mat img_1;
Mat img_2;
UIImageToMat(img1, img_1);
UIImageToMat(img2, img_2);
if( !img_1.data || !img_2.data )
{
std::cout<< " --(!) Error reading images " << std::endl;
}
//-- Step 1: Detect the keypoints using SURF Detector
int minHessian = 400;
SurfFeatureDetector detector( minHessian );
std::vector<KeyPoint> keypoints_1, keypoints_2;
detector.detect( img_1, keypoints_1 );
detector.detect( img_2, keypoints_2 );
//-- Step 2: Calculate descriptors (feature vectors)
SurfDescriptorExtractor extractor;
Mat descriptors_1, descriptors_2;
extractor.compute( img_1, keypoints_1, descriptors_1 );
extractor.compute( img_2, keypoints_2, descriptors_2 );
//-- Step 3: Matching descriptor vectors using FLANN matcher
FlannBasedMatcher matcher;
std::vector< DMatch > matches;
matcher.match( descriptors_1, descriptors_2, matches );
double max_dist = 0; double min_dist = 100;
//-- Quick calculation of max and min distances between keypoints
for( int i = 0; i < descriptors_1.rows; i++ )
{ double dist = matches[i].distance;
if( dist < min_dist ) min_dist = dist;
if( dist > max_dist ) max_dist = dist;
}
printf("-- Max dist : %f \n", max_dist );
printf("-- Min dist : %f \n", min_dist );
//-- Draw only "good" matches (i.e. whose distance is less than 2*min_dist )
//-- PS.- radiusMatch can also be used here.
std::vector< DMatch > good_matches;
for( int i = 0; i < descriptors_1.rows; i++ )
{ if( matches[i].distance <= 2*min_dist )
{ good_matches.push_back( matches[i]); }
}
//-- Draw only "good" matches
Mat img_matches;
drawMatches( img_1, keypoints_1, img_2, keypoints_2,
good_matches, img_matches, Scalar::all(-1), Scalar::all(-1),
vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS );
//-- Show detected matches
//imshow( "Good Matches", img_matches );
UIImage *imgTemp = MatToUIImage(img_matches);
for( int i = 0; i < good_matches.size(); i++ )
{
printf( "-- Good Match [%d] Keypoint 1: %d -- Keypoint 2: %d \n", i, good_matches[i].queryIdx, good_matches[i].trainIdx );
}
return imgTemp;
}
UIImageToMat(img1, img_1);
UIImageToMat(img2, img_2);
cvtColor(img_1, img_1, CV_BGRA2BGR);
cvtColor(img_2, img_2, CV_BGRA2BGR);