无法创建SIFT检测器和提取器

Question

我正在尝试使用以下代码检测SIFT关键点：

#include "opencv2/features2d/features2d.hpp"
#include "opencv2/nonfree/nonfree.hpp"
#include "opencv2/nonfree/features2d.hpp"

[...]

Ptr<FeatureDetector> detector = FeatureDetector::create( "SIFT" );
vector<KeyPoint> keyPoints;
detector->detect( image, keyPoints );
The problem is that my detector pointer points to nowhere after that last line, and no error is shown in the console.

我正在使用QtCreator，我的.pro文件包含：

LIBS += -lopencv_nonfree
CONFIG += link_pkgconfig
PKGCONFIG += opencv

所以我的makefile包含：

LIBS          = $(SUBLIBS) -lopencv_nonfree [...]  /usr/local/lib/libopencv_nonfree.so [...]

加载库时没有错误。

我已经按照这些说明安装了opencv。

Answer 1

我忘了打电话给cv::initModule_nonfree(); 在做其他事情之前。