如何通过opencv中的程序参数定义特征类型?

How to define feature type through program argument in opencv?

本文关键字：定义 特征 类型 参数 程序 何通过 opencv      更新时间：2023-10-16

当前更改要素类型是通过在代码中手动更改名称来完成的。例如，对于 SURF 检测器和描述符，我必须在以下代码示例中将单词"SURF"更改为其他名称：

Ptr<SURF> detector = SURF::create();
Ptr<SURF> descriptor = SURF::create();

有没有办法通过程序参数更改"SURF"部分来更改特征类型？

我希望能够批量评估多个要素类型，而不是每次都手动键入要素类型。

您似乎希望Ptr<FeatureDetector> cv::FeatureDetector::create(const string& detectorType)函数提供的功能：

"FAST" – FastFeatureDetector 
"STAR" – StarFeatureDetector 
"SIFT" – SIFT (nonfree module) 
"SURF" – SURF (nonfree module) 
"ORB" – ORB
"BRISK" – BRISK 
"MSER" – MSER 
"GFTT" – GoodFeaturesToTrackDetector
"HARRIS" – GoodFeaturesToTrackDetector with Harris detector enabled
"Dense" – DenseFeatureDetector 
"SimpleBlob" – SimpleBlobDetector
Also a combined format is supported: 
feature detector adapter name ( "Grid" – GridAdaptedFeatureDetector, "Pyramid" – PyramidAdaptedFeatureDetector )
+ feature detector name (see above), for example: "GridFAST", "PyramidSTAR"

它返回指向 FeatureDetector 基类的指针，因此您可以使用多态性在运行时选择特定实现：

//assuming image path is the first command line parameter and detector type is the second parameter
auto image = cv::imread(argv[1]);
auto ptr = cv::FeatureDetector::create(argv[2]); //auto evaulates to cv::Ptr<cv::FeatureDetector> here
std::vector<cv::KeyPoint> keypoints;
ptr->detect(image, keypoints);
for (auto kp : keypoints)
cv::circle(image, kp.pt, 2, cv::Scalar(0, 255, 255), -1);
cv::imwrite(argv[1], image);

模板呢？

template<class T> cv::Ptr<T> FeatureDetectorCreator()
{
return T::create();
};

然后你可以用以下命令调用它：

cv::Ptr<SURF> detector = FeatureDetectorCreator<SURF>();

替代可能是宏。

只有当所有这些特征检测器共享一个通用接口时，才会起作用。

OpenCV 3.x

没有内置函数。使用Ptr<FeatureDetector>定义检测器(描述符等效于Ptr<DescriptorExtractor>(。示例代码如下：

string det = argv[4]; //assuming detector definition is fourth argument
Ptr<FeatureDetector> detector;
if (det == "SURF") {
detector = SURF::create();
} else if (det == "SIFT") {
detector = SIFT::create();
}

OpenCV 2.4.x

使用提供的函数Ptr<FeatureDetector> cv::FeatureDetector::create(const string& detectorType).有关更多详细信息，请参阅slawekwin的回答。

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