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Thanks a lot for the info! Could you copy your first comment as answer so I could choose it as a correct answer?

One more question then. If I use the seperate interface (detect() / compute()) in a algortithm that provides both keypoint detector and descriptor (detectAndCompute()) will there be an overhead ???

Hi everyone,

In the last couple of months, I am experimenting with the features extraction algorithms. I notice that there are two ways in computing the features and I was wondering what is the difference between:

std::vector<cv::KeyPoint> keypoint;
cv::Mat descriptors;

detector_->detect(frame_, keypoint);
descriptor_->compute(frame_, keypoint, descriptors);

and:

std::vector<cv::KeyPoint> keypoint;
cv::Mat descriptors;

detector_->detectAndCompute(features_frame_, cv::noArray(),keypoint,descriptors)

when using the Feature2D class (http://docs.opencv.org/3.1.0/d0/d13/c...). Is there a reason to use the second call, instead of the first?

With kind regards

Vasilis

Thank you everyone for your respones! I have already compiled opencv with opencl on. P.S.: How can choose a comment as a correct answer?

@LBerger I am guessig that each algorithm that has an OpenCL impelemntation must have somewhere in the source code #ifdef HAVE_OPENCL. I am right ? @Tetragramm How can I be sure that the opencl implementation is being called and the algorithm is running on GPU and not on the CPU?

Thank you both in advance

Hi,

I was wondering which algorithms for feature detection and description have already an opencl implementation that can be used with the UMat class. Where can I find this kind of information?

With kind regards

Vasilis

Hi everobody,

Is it possible to use RANSACPointSetRegistrator (https://github.com/Itseez/opencv/blob...) to estimate parameters for your own model. For example to estimate rotation from two set of data points with outliers or somehting similar.

Has anyone done something similar?

With kind regards

Vasilis

Are you planning to release binaries for visual studio 2015 in the near future ?

Kind regards

anagno