OpenCV学习笔记：drawmatches函数的参数详解

一、函数构造

// Draws matches of keypints from two images on output image.
void drawMatches( const Mat& img1, const vector<KeyPoint>& keypoints1,
                  const Mat& img2, const vector<KeyPoint>& keypoints2,
                  const vector<vector<DMatch> >& matches1to2, Mat& outImg,
                  const Scalar& matchColor=Scalar::all(-1), const Scalar& singlePointColor=Scalar::all(-1),
                  const vector<vector<char> >& matchesMask=vector<vector<char> >(), int flags=DrawMatchesFlags::DEFAULT );

二、参数详解

• img1 – 源图像1
• keypoints1 – 源图像1的特征点.
• img2 – 源图像2.
• keypoints2 – 源图像2的特征点
• matches1to2 – 源图像1的特征点匹配源图像2的特征点[matches[i]] .
• outImg – 输出图像具体由flags决定.
• matchColor – 匹配的颜色（特征点和连线),若matchColor==Scalar::all(-1)，颜色随机.
• singlePointColor – 单个点的颜色，即未配对的特征点，若matchColor==Scalar::all(-1)，颜色随机.
• matchesMask – Mask决定哪些点将被画出，若为空，则画出所有匹配点.
• flags – Fdefined by DrawMatchesFlags.

三、示例

☀ Demo1:

drawMatches(srcImg1, keyPoints1, srcImg2, keyPoints2, good_matches, result, Scalar(0, 255, 0), vector<char>(), 2);

效果：

☀ Demo2：

drawMatches(srcImg1, keyPoints1, srcImg2, keyPoints2, good_matches, result, Scalar(0, 255, 0), Scalar::all(-1));

效果：

☀ Demo3:

drawMatches(srcImg1, keyPoints1, srcImg2, keyPoints2, good_matches, result);

效果：

End && Enjoy!