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2017-09-03 19:45:45 -0500 marked best answer fast way to draw ellipse axes?

Is there any way to draw ellipse axes in opencv?

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2017-06-20 08:36:52 -0500 marked best answer annotation tool for object detection

Is there some annotation tool that I can use for mark objects on images and then use this croped object images to train classifers?

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2014-12-09 14:14:47 -0500 marked best answer how to watch cv::Mat type in VC++ debugger?

Is there way to see what type of Mat is current Mat? for example CV_32FC1 or CV_64FC1.

I don't mean something like src.type() == CV_32FC1 I need to watch type of Mat on some breakpoint.

2014-12-09 14:13:35 -0500 marked best answer cmake OpenCV_DIR

Using this cmake file and pre-build version of opencv I get this error.

I need to set OpenCV_DIR?

CMake Warning at /OpenCV-2.4.3/cmake/OpenCVConfig.cmake:153 (message): Found OpenCV 2.4.3 Windows Super Pack but it has not binaries compatible with your configuration.

  You should manually point CMake variable OpenCV_DIR to your build of

OpenCV library. Call Stack (most recent call first): CMakeLists.txt:4 (find_package)

CMake Error at CMakeLists.txt:4 (find_package): Found package configuration file:


but it set OpenCV_FOUND to FALSE so package "OpenCV" is considered to be

2014-12-09 14:04:23 -0500 marked best answer shape context implementation in opencv

I want to use shape context for contour matching and for contour clusterization/classification, I have already implimented it in opencv, but I don't understand how to use it in case if contours have different number of points? maybe I can add some fictitious points between real point or simplify contour to delete some points?

In paper they just add some "dummy" points, but it's only suitable for shape comparision, but if I want to use vector of features for example in SVM,feature vector need to be the constant size.

2014-12-09 14:01:26 -0500 marked best answer how to free memory through cv::Mat ?
IplImage* src= cvLoadImage("1.tif");
        Mat m= src;//no copy
        Mat m1(src);//no copy
        m.release();//don't free mem
        m1.release();//don't free mem
        cvReleaseImage(&src);//free mem

how to free memory through cv::Mat ?

2014-12-09 13:57:57 -0500 marked best answer How to use trainHOG with liblinear or libsvm?

How to use trainHOG with liblinear or libsvm?

this tutor only for svmlight

If you are planning in training with LIBSVM instead of SVMlight, pass me a note so I can provide you with some code.

So where I can find the code?

2014-12-09 13:47:59 -0500 marked best answer convert from vector to Mat

I have

vector<cv::Point> pts

and I want to use it with FLANN I tried

cv::flann::Index tree= cv::flann::Index(cv::Mat(pts),cv::flann::KDTreeIndexParams(1));

but it doesn't work.I think I must convert pts to Mat.

How I can do this?

2014-12-09 13:46:32 -0500 marked best answer Mat element access

I read this article, but I can't find how to access Mat element like this


is it possible? And another question is how can I don't omit type of Mat, but check types on compilation time.

instead of<uchar>(i,j)

something like this

2014-12-09 13:45:16 -0500 marked best answer Pixel access through python interface

Can anyone give a code snippet of image pixel access through python interface? (maybe fasterst and simplest methods also differ)