Standard Hough Circle Detection
Hello forum, Ive been trying to write the code for the standard hough circle detection but have not succeded. The code (very simple) is shown below. Basically i perform canny edge detection and then...
View ArticlePython and C++ : different compilers ok?
Hi all, I have been looking at opencv (3.0) closely. I haven't decided whether I will have a C++ application or a Python application. I am wondering what sort of environment C++ developers have? Do you...
View ArticleOpencv 3.0 Assertion failed in undistort.cpp
Hi! After roslaunch monocular_pose_estimator demo.launch [git](https://github.com/uzh-rpg/rpg_monocular_pose_estimator) OpenCV Error: Assertion failed (CV_IS_MAT(_cameraMatrix) &&...
View Articleface detection and matching with another face
I want to make a code which will detect face from live webcam and will match the detected face with another face. I'm newbie at opencv , I cant understand how to convert detected face as variable. Pls...
View ArticleEpipolar geometry pose estimation: Epipolar lines look good but wrong pose
I am trying to use OpenCV to estimate one pose of a camera relative to another, using SIFT feature tracking, FLANN matching and subsequent calculations of the fundamental and essential matrix. After...
View ArticleHow do you get OpenCV 3.0 to install cv2.so during make install?
I recently built OpenCV 3.0 from source and installed it to my Ubuntu 14.04 system. I double checked that various options were set using ccmake *dir with CMakeLists.txt*, including...
View Article"Train dataset for temp stage can not be filled." on opencv_traincascade
I'm trying to make a Haar Feature-based Cascade Classifier using opencv_traincascade. But I have had this message. PS C:\cascade2\TrainingData> opencv_traincascade -data .\result\ -vec positive.vec...
View ArticleOpenCV Object Tracker Test Bed to Help Beginners Get Started
Hi, I've implemented an OpenCV tracker Test bed to help beginners get started. The test bed is located at: https://github.com/vjmeza/opencv_tracker_testbed The test bed is an open source console...
View ArticleRotate Landmarks
Hello. I have various files with 2D coordinates describing faces of people. In OpenCV I'm using the circle function to draw each of these coordinates in a black background (Mat::zeros), so:  look higher than ...
View Articledraw circle function (x,y) coordinate help (Hough circle)
Hello forum, I wrote a simple code for the standard hough circular transform. However, I am unsure why the center of the circle is shifted. Can anyone help me on this ? int main(int argc, char** argv)...
View Articleread from usb flash memory
Hi what is the openCv instruction that enables my C++ program to read from usb flash memory inserted to my pc? thnks
View ArticleUnable to include modules from opencv_contrib. fatal error: opencv2/face.hpp
I installed the latest version of opencv (OpenCv 3.0.0 Beta). I downloaded the opencv_contrib module and built it with opencv by doing a cmake (by following the instructions in the readme...
View ArticleRemoving certain pixels with threshold
For example, there are 9 region of interest. I need to remove those that are bigger than 1000 and smaller than 65. What is the best way to do it? I was using this method but it is not working. ![image...
View ArticleOpenCV 3.0 Vs OpenCV 2.4.9 + Sobel Performance
I'm experiencing a very performance differences between 2.4.9 and 3.0. With the simple Soble function I see OpenCV 3.0 run 10x slower than OpenCV 2.4.9 ... O_O ... I've build up a Visual Studio 2013...
View ArticleOpencv 3.0, visual studio 2013-
Ok, basically I am trying to compile a test program to make sure that I installed and linked opencv and visual studio properly. I seems that I haven't although I have triple checked my system...
View ArticleHow to read / write xml file in Java
Has anyone written the calibration / distortion matrix from Java and have them read by a c++ code using xml?
View ArticleCan I use a code in C ++ OpenCV on an Android project?
Hello, i have a code OpenCV C++ that does some transformations at images. I would like to know if you can make an Android project that uses the camera to take a picture and then call the code I already...
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