How to remove false matches in brute force matcher?
My requirement is to compare an image against a set of images in the database and find the best possible match. I have tried using brute force matcher algorithm, but I am getting lot of false matches....
View ArticleOpenCV Error: Bad argument (Unknown array type) in cv::cvarrToMat
 Good Day Guys, I am detecting a paper by finding out biggest rectangle in an image which is performed by code given below which i found in the link...
View ArticleProblem with Cascade Classifier
I've problems with the Cascade Classifer. I created 5000 positive samples like this:  with this command:...
View ArticleCompiling/Installing from source -- python import cv2 module could not be found
I'm receiving the error "ImportError: DLL load failed: The specified module could not be found." when I type "import cv2" in python (2.7 32 bit). Typing sys.path reveals...
View Articleeye landmark points
Hi I'm using facial landmark detector (dlib) to detect eye blinks . How the eye landmarks can be imported to a file ? I need to use eye landmarks to calculate the ration between height and width of...
View Articleread arrow orientation from image
Hello. I created script to get arrows from the image. Im trying to detect orientation for each arrow. With my script i manage to get somewhat accurate results. The problem is that Im getting same...
View ArticleStereo calibration fails
I am trying to properly calibrate a multi-stereo system. For this, I need to first calibrate camera intrinsic parameters, then the stereo extrinsic parameters for each pair, then the extrinsics between...
View ArticleDelphi-OpenCv Face Detection Recognition
Face Detection and Recognition from Delphi OpenCv Delphi with MxAccess / Sqlite http://www.mediafire.com/file/xa15uo26ocpxciw/Delphi-OpenCv-FR-Test-Sample.zip I was crazy asking help for Delphi OpenCv,...
View ArticleBest classification method for SURF
I'm using SURF to extract keypoints and descriptors, but I don't know which machine learning method is the best one to match the descriptors. I've followed OpenCV tutorial with FLANN and KNN...
View ArticleCan't run sample dnn program
I am using Opencv 3.1.0 on ubuntu 14.04. I have successfully built Opencv and wanted to try reading a caffe model and classifying. I used the program and models from this...
View ArticlestereoCalib example crashes on findChessBoard
Hi, i am trying to run the stereo_calib.cpp example. It is crashing on my images, so i am now trying with teh given opencv data/images. It will run through twice, but when it reaches the 3rd image...
View Articleaccess violation in copyTo
I am reading an image from IPCamera (using VLC API). I store this image in `cv::Mat` called `ipCameraImage`. Then I am doing deep-copy for this Mat into another Mat using: auto...
View ArticlePointer to image problem
Dear everyone, I faced with an error when using below code: void init(Mat *mF) { Mat mm = (Mat_(4, 4) << 1, 1, 1, 2, 2, 1, 0, 1, 1, 0, 2, 1, 3, 0, 0, 1); *mF = mm; } The error opened below line:...
View Articleerror in mathcalls.h when install opencv3 in ubuntu 16
I followed the installation tutorial here : http://docs.opencv.org/3.1.0/d7/d9f/tutorial_linux_install.html in the build step, I type make -j5. Then it has the follwing error. I am not sure why this...
View ArticleOpencv resize methods
I need to resize some low-resolution images (e.g. 16x16, 24x24) to the default size of 100x100 pixels in **Python**. I am already using the "**resize**" method with the interpolation parameter...
View ArticlePython: Fish-eye PnP Distortion Coefficients
I have the intrinsic parameters of fish-eye camera with fisheye model in opencv310 and I want to calculate the rotation vector and translation vector for arbitrary image using pose-from-N-points. As...
View ArticleLDA::subspaceProject and subspaceReconstruct in Java
Hi everyone. I am trying to convert the [Fisherface and Eigenface demos](http://docs.opencv.org/2.4/modules/contrib/doc/facerec/facerec_tutorial.html#eigenfaces) from C++ to Java. I am using OpenCV...
View ArticleOpencv_traincascade failing on precalculation for negatives
I have tried several times now to use opencv_traincascade (using vc12 and vc11 from Windows build), but I keep running into the error: BEGIN POS count : consumed 40 : 40 Train dataset for temp stage...
View ArticleCan't compile OpenCV 3 on Mac Missing libXext.6.dylib
Mac OS 10.12.1 with latest head of OpenCV. Having a problem with a stray library. Any suggestions on how to fix? dyld: Library not loaded: @executable_path/lib/libXext.6.dylib Referenced from:...
View ArticleHow to calculate Essential Matrix?
I have used used BRISK features for feature matching as shown in code below and now want to calculate Essential Matrix can you let me know how to do it.I would like the detailed answers. import cv2...
View Article