BRISK特征检测器检测零关键点 [英] BRISK feature detector detects zero keypoints

问题描述

下面显示的轻灵探测器不给我任何关键点。有人可以提出一个问题。
我会尝试用一些代码解释我在做什么。

  #includeopencv2 / features2d /features2d.hpp
 
 using namespace cv; 
使用namespace std; 
 
 Ptr< FeatureDetector>探测器; 
 detector = FeatureDetector :: create（BRISK）; 
 
 //文件名被赋予一些路径
 
 Mat img = imread（filename，0）; 
 CV_Assert（！img.empty（））; 
 
 vector< KeyPoint> KP; 
 
 detector-> detect（img，kp）; 
  

因此，当我调试并检查关键点（kp）时，它说< 0 items> / p>

使用类似的代码，其他检测器如ORB，SIFT或SURF可以按照预期工作！

有人可以提出解决方案。

我使用的是使用Qt创建器2.5.2的opencv 2.4.9感谢

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解决方案

好的，我自己做到了！

对于感兴趣的人， BriskFeatureDetector的参数即八度= 3和三= 30并不给我关键点。但是，当我将原作者的演示中显示的octaves = 0更改为使用Brisk的AGAST检测器时，它给了我相当多的关键点。

谢谢并享受！

The Brisk detector shown below gives me no keypoints. Can somebody please suggest a problem. I will try to explain what I am doing below with some of the codes.

#include "opencv2/features2d/features2d.hpp"

using namespace cv;    
using namespace std;

Ptr<FeatureDetector> detector;
detector =  FeatureDetector::create("BRISK");

// the filename is given some path

Mat img = imread(filename, 0);
CV_Assert( !img.empty() );

vector<KeyPoint> kp;

detector->detect(img, kp);

So, when I debug this and check the keypoint (kp) it says <0 items>

with similar code other detector like ORB, SIFT or SURF work as intended!

Can somebody please suggest a solution.

I am using opencv 2.4.9 with Qt creator 2.5.2

Thanks

解决方案

Okay, I got it myself!

For someone interested, the default values of the parameters for BriskFeatureDetector i.e octaves = 3 and thres = 30 doesn't gave me keypoints at all. But when I change the octaves = 0 as shown in the original author's demo to use AGAST detector of Brisk, it gave me a considerable amount of keypoints.

Thanks and enjoy!

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