OpenCV - 图像拼接

Question

我正在使用以下代码来拼接输入图像.由于未知原因输出结果是垃圾!似乎单应矩阵是错误的(或者被错误地影响),因为变换的图像就像一个"被利用的星"!我已经评论了我认为是问题根源但我无法实现的部分.任何帮助或观点都是适当的!

祝你有美好的一天,阿里

void Stitch2Image(IplImage *mImage1, IplImage *mImage2) 
{ 

    // Convert input images to gray 
    IplImage* gray1 = cvCreateImage(cvSize(mImage1->width, mImage1->height), 8, 1); 

    cvCvtColor(mImage1, gray1, CV_BGR2GRAY); 
    IplImage* gray2 = cvCreateImage(cvSize(mImage2->width, mImage2->height), 8, 1); 

    cvCvtColor(mImage2, gray2, CV_BGR2GRAY); 
    // Convert gray images to Mat 
    Mat img1(gray1); 
    Mat img2(gray2); 
    // Detect FAST keypoints and BRIEF features in the first image 
    FastFeatureDetector detector(50); 
    BriefDescriptorExtractor descriptorExtractor; 
    BruteForceMatcher<L1<uchar> > descriptorMatcher; 
    vector<KeyPoint> keypoints1; 
    detector.detect( img1, keypoints1 ); 
    Mat descriptors1; 
    descriptorExtractor.compute( img1, keypoints1, descriptors1 );

/* Detect FAST keypoints and BRIEF features in the second image*/


    vector<KeyPoint> keypoints2; 
    detector.detect( img1, keypoints2 ); 
    Mat descriptors2; 
    descriptorExtractor.compute( img2, keypoints2, descriptors2 ); 
    vector<DMatch> matches; 
    descriptorMatcher.match(descriptors1, descriptors2, matches); 
    if (matches.size()==0) 
            return; 
    vector<Point2f> points1, points2; 
    for(size_t q = 0; q < matches.size(); q++) 
    { 
            points1.push_back(keypoints1[matches[q].queryIdx].pt); 
            points2.push_back(keypoints2[matches[q].trainIdx].pt); 
    } 
    // Create the result image 
    result = cvCreateImage(cvSize(mImage2->width * 2, mImage2->height), 8, 3); 
    cvZero(result); 

   // Copy the second image in the result image 

    cvSetImageROI(result, cvRect(mImage2->width, 0, mImage2->width, mImage2->height)); 
    cvCopy(mImage2, result); 
    cvResetImageROI(result); 

  // Create warp image 
    IplImage* warpImage = cvCloneImage(result); 
    cvZero(warpImage); 

  /************************** Is there anything wrong here!? *******************/ 
   // Find homography matrix 
    Mat H = findHomography(Mat(points1), Mat(points2), 8, 3.0); 
    CvMat HH = H; // Is this line converted correctly? 
   // Transform warp image 
    cvWarpPerspective(mImage1, warpImage, &HH); 
  // Blend 
    blend(result, warpImage);
  /*******************************************************************************/ 

    cvReleaseImage(&gray1); 
    cvReleaseImage(&gray2); 
    cvReleaseImage(&warpImage); 
}

Answer 1

这是我建议您按此顺序尝试的内容:

1)使用CV_RANSAC选项进行单应性.请参阅http://opencv.willowgarage.com/documentation/cpp/calib3d_camera_calibration_and_3d_reconstruction.html

2)尝试其他描述符,特别是OpenCV附带的SIFT或SURF.对于某些图像,FAST或BRIEF描述符不够区分.编辑(2012年8月):ORB描述符,基于BRIEF,非常好,速度快!

3)尝试查看Homography矩阵(在调试模式中单步执行或打印它)并查看它是否一致.

4)如果上面没有给你一个线索,试着看看形成的比赛.是否将一个图像中的一个点与另一个图像中的多个点匹配？如果是这样,问题应该再次出现在描述符或探测器上.

我的预感是它是描述符(所以1)或2)应该修复它).