BRISK feature detector detects zero keypoints
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
One Solution collect form web for “BRISK feature detector detects zero keypoints”
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!