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Normalizing Sobel Filter Noise

I'm writing my own sobel filter and am having trouble getting it to run properly. I'm applying a vertical and horizontal convolution to a grayscale image, which appear to have *some* result when...

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Mathematics behind contour detection algorithm

Hi all, what is the maths concept behind opencv contour detection algorithm?

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OpenCV 3.1.0 Face module built , can't import in Python

I cmaked OpenCV 3.1.0 with success and then cmaked extras: cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_PYTHON_SUPPORT=ON .. cmake -D...

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OpenCV on Android without the OpenCV Manager

Yes, I know this question has been asked many times before, but this is a real issue if you want to do any serious application development on Android. We need an easy and simple way of bundling and...

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use c++ on android without java and jni

Hello, does it possible to use c++ on Android (ONLY C++ AND ANDROID COMPONNET + OPENCV)? (LIKE VISUAL STUDIO AND VC++ and opencv) we do not want to use the java or JNI . Thanks.

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depth() and channel() function return incorrect values

Hi, I am a newbie with opencv. I am using opencv3.1. I was reading the depth and channles of images but it returns weird values. Here is my code: string filepath =...

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How to make a private library in OpenCV 3.0

Hello, My name is tej kamal and i am working on ubuntu 14.04 operating system. I need to know how to create a private library in open camera vision please. Thank you

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Rotation matrix to rotation vector (Rodrigues function)

Hello, I have a 3x3 rotation matrix that I obtained from stereoCalibrate (using the ros stereo calibration node). I need to obtain a rotation vector (1x3), therefore I used the rodrigues formula. When...

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@file SURF_FlannMatcher and OpenCV 3.0.0 do not link

Hi I am relatively new to OpenCV. I program C++ in Vis Studio 2013 and use Cuda 6.5. I found FlannMatcher algorithm as presented on OpenCV as a good tool for parts of what I need to do. It took me 3...

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How to revert to OpenCV2.4.11 after installing OpenCV3?

i've install OpenCV2.4.11 in my raspberry-pi, and few days ago i installed OpenCV3. There is no problem with the OpenCV3, but now i want to use back OpenCV2.4.11.> is there any way to use...

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How to run 'facerec_fisherfaces.cpp' in opencv_contrib

I've installed opencv-master and opencv_contrib-master. I have a question about 'opencv_contrib'. I had followed 'README.txt' in opencv_contrib, but I cannot run samples such as...

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How to run 'facerec_fisherfaces.cpp' in opencv_contrib

I have a question about 'opencv_contrib'. I followed the sequence of 'README.txt', but I cannot run samples such as 'opencv_contrib/modules/face/samples/facerec_fisherfaces.cpp'. When I compile it, it...

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OpenCV/iOS: SimpleBlobDetector detects 0 points

In my iOS app developed by Swift, for the moment, I am just trying to detect the center of an elliptical object (a 2€ coin) in a photo. It is the first time I have approached to OpenCV 3.1 so,...

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how to know the angle of orientation of the detected rectangular object with...

Hello, My program has to detect the rectangular object present in the water and measure its angle of orientation with respect to X-Axis. The idea behind this is, i have to move my vehicle in the...

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Why do I keep getting rotated rect's when they are circles?

I'm doing rectangle detection using canny edges and contour detection using Emgu CV ([example](http://www.emgu.com/wiki/index.php/Shape_(Triangle,_Rectangle,_Circle,_Line)_Detection_in_CSharp)). I...

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Python - OpenCV stereocalibration error

I m trying to use the stereo part of openCV (3.0.0-dev version). I can do all the calibration for each cameras so i got the 2 camera matrix and distorsion vectors. But when i try to apply the...

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How to add new images to yml dataset?

Hi to everyone! I save the trained model: trainedmodel->save("C:\\fisherface.yml"); And load it from the file pass: trainedmodel->load("C:\\fisherface.yml"); But is there any way to update the...

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How do I convince Visual Studio to go through OpenCV source files while...

Steps I've taken: 1. Built OpenCV from source, so that I have the *d.pdb and *d.dll in the same folder (C:\OpenCV\bin) 2. Added C:\OpenCV\bin to Tools -> Options -> Debugging -> Symbols....

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strange behaviour with c++0x/c++11/c++1y compiler flags and image showing

Ok as the title says I have an issue with loading an image and using different CXX_FLAGS in the compiler. In the project that I am working if I set `set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}...

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How to detect an ellipse?

I'm currently using Emgu CV, and I'm trying to locate a target such as the one below.![image description](/upfiles/14537479046095412.jpg) I attempted to use HoughCircle method to find the ellipses,...

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