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what is the dimension of feature descriptor from BRISK and FREAK? How do I compute

How can I access the feature descriptor from FREAK and Brisk in oepncv framework....

for e.g.

include <cv.hpp>

include <cxcore.hpp>

include <highgui.h>

include <opencv2\highgui\highgui.hpp>

include <opencv2 core="" core.hpp="">

include <opencv2 highgui="" highgui.hpp="">

include <opencv2 features2d="" features2d.hpp="">

include <opencv2 nonfree="" features2d.hpp="">

int main() {

const char * PimA="water1.jpg"; // object const char * PimB="water2.jpg"; // image

cv::Mat GrayA =cv::imread(PimA); cv::Mat GrayB =cv::imread(PimB);

std::vector<cv::keypoint> keypointsA, keypointsB; cv::Mat descriptorsA, descriptorsB;

int Threshl=60; int Octaves=4; float PatternScales=1.0f; cv::BRISK BRISKD(Threshl,Octaves,PatternScales);//initialize algoritm BRISKD.create("Feature2D.BRISK");

BRISKD.detect(GrayA, keypointsA); BRISKD.compute(GrayA, keypointsA,descriptorsA);

BRISKD.detect(GrayB, keypointsB); BRISKD.compute(GrayB, keypointsB,descriptorsB); } Now I want to access the elements inside descriptorsA and descriptorsB

what will be the dimension of those feature descriptors as well!

what is the dimension of feature descriptor from BRISK and FREAK? How do I compute

How can I access the feature descriptor from FREAK and Brisk in oepncv framework....

for e.g.

~~include <cv.hpp>~~

#include <cv.hpp>
#include <cxcore.hpp>
#include <highgui.h>
#include <opencv2\highgui\highgui.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/features2d/features2d.hpp>
#include <opencv2/nonfree/features2d.hpp>
 include <cxcore.hpp>
 include <highgui.h>
 include <opencv2\highgui\highgui.hpp>
 include <opencv2 core="" core.hpp="">
 include <opencv2 highgui="" highgui.hpp="">
 include <opencv2 features2d="" features2d.hpp="">
 include <opencv2 nonfree="" features2d.hpp="">
 int main()
{{
  const char * PimA="water1.jpg";   // object
const char * PimB="water2.jpg"; // imageimage
  cv::Mat GrayA =cv::imread(PimA);
cv::Mat GrayB =cv::imread(PimB);=cv::imread(PimB);
  std::vector<cv::keypoint> std::vector<cv::KeyPoint> keypointsA, keypointsB;
cv::Mat descriptorsA, descriptorsB;descriptorsB;
  int Threshl=60;
int Octaves=4; 
float PatternScales=1.0f;
cv::BRISK  BRISKD(Threshl,Octaves,PatternScales);//initialize algoritm
BRISKD.create("Feature2D.BRISK");BRISKD.create("Feature2D.BRISK");
  BRISKD.detect(GrayA, keypointsA);
BRISKD.compute(GrayA, keypointsA,descriptorsA);keypointsA,descriptorsA);
  BRISKD.detect(GrayB, keypointsB);
BRISKD.compute(GrayB, keypointsB,descriptorsB);
}

Now I want to access the elements inside descriptorsA and descriptorsB

what will be the dimension of those feature descriptors as well!