OpenCV: Using cvGoodFeaturesToTrack with C++ mat variable - c++

Question

I am trying to use the cvGoodFeatureToTrack function in Visual Studio 2010 with the image type as Mat. Most of the examples I have seen use the IplImage pointer.
Right now I have this:
int w, h; // video frame size
Mat grayFrame;
Mat eigImage;
Mat tempImage;
const int MAX_CORNERS = 10;
CvPoint2D32f corners[MAX_CORNERS] = {0};
int corner_count = MAX_CORNERS;
double quality_level = 0.1;
double min_distance = 10;
int eig_block_size = 3;
int use_harris = false;
w = CurrFrame.size().width;
h = CurrFrame.size().height;
cvtColor(CurrFrame, grayFrame, CV_BGR2GRAY);
cvGoodFeaturesToTrack(&grayFrame,
&eigImage,
&tempImage,
corners,
&corner_count,
quality_level,
min_distance,
NULL,
eig_block_size,
use_harris);
It compiles but gives me a memory access violation. Help!

Answer 1

As a starting point, if using C++ anyway (like your use of cv::Mat and cv::cvtColor suggests), then why not use C++ interface for the rest, too?
This would mean the use of cv::goodFeaturesToTrack or a cv::GoodFeaturesToTrackDetector, which are made to work on cv::Mat and friends instead of making unneccessary casts from cv::Mat to IplImage*.
cv::Mat grayFrame;
std::vector<cv::Point2f> corners;
double quality_level = 0.1;
double min_distance = 10;
int eig_block_size = 3;
int use_harris = false;
const int MAX_CORNERS = 10;
cv::cvtColor(CurrFrame, grayFrame, CV_BGR2GRAY);
cv::goodFeaturesToTrack(grayFrame,
corners,
MAX_CORNERS,
quality_level,
min_distance,
cv::noArray(),
eig_block_size,
use_harris);