OpenCV Q&A Forum - RSS feed

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Using OpenCV4Android, how to blur a part of an image?

April 10, 2016, 7:38 pm

I am using `inRange()` function of `OpenCV4Android` to detect a colored blob in an image. Then I am using `drawContours()` to draw the contours around the selected object. What I want is that when the...

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how to split mosaic image by their edge?

April 11, 2016, 12:44 am

image is as below,it is a mosaic image, it is consist of three images, i want to get the two edge position that separate the three images, how to do this? ![image...

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Real time disparity map using C++ with opencv on MVS

April 11, 2016, 12:55 pm

I have a disparity map of two images using c++ with opencv on MVS. However, just trying to get some help transitioning to real time disparity maps. Apologies for such a basic question, i am new to c++...

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how to use Opencv machine learning for android project (KNN or SVM algorithms)?

April 11, 2016, 2:24 pm

I need your help .I am a beginner in opencv and i should recognize letters in an image taken by android camera .I should use opencv machine learning such us KNN or SVM .I searched a lot but i don't...

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Trying to build OpenCV with Cmake and Visual studio 2010

April 12, 2016, 2:12 am

Hi, Presently, I am using OpenCV 3.0, CMake 2.8.11 and Visual Studio 2010 Express Edition. when, I am trying to Configure it for Visual Studio 2010 and build the binary file, I am getting the error as...

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error C1083 cannot open eigen/core

April 12, 2016, 6:02 am

I download a source code from internet. There is no instruction on developing this code except that it said it uses Microsoft visual studio and opencv 2.1. Then I found in the additional include file...

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process of ORB algorithm in OpenCV

April 12, 2016, 6:40 am

Dear great OpenCV community I am a computer science bachelor student. Presently, I am using OpenCV 3.0.0 and Android Studio to make an markerless augmented reality android app for my thesis. For the...

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Why there are two versions of OpenCV 3.x and 2.4.xx ?

April 12, 2016, 10:07 am

Why there are two versions of openCV 3.x and 2.4.xx ? I 'm still confused , which one should I select , the two versions seems to be active , is there any plan to stop one of them , what is the rule...

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error c2665 regarding imshow

April 12, 2016, 8:56 pm

Here I provide the output of build: error C2665: 'cv::imshow' : none of the 2 overloads could convert all the argument types 1> c:\opencv30\opencv310\opencv\build\include\opencv2\highgui.hpp(552):...

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Android - Opencv - error: (-215) u != 0 in function void cv::Mat::create

April 13, 2016, 2:26 am

My app keeps crashing with this error FATAL EXCEPTION: Thread-22883 Process: com.aar.Cline, PID: 7270 CvException [org.opencv.core.CvException: cv::Exception:...

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Getting this error when trying to build the INSTALL in Release Mode

April 13, 2016, 6:15 am

![image description](/upfiles/14605527968948298.jpg) Hi, Presently, I am using OpenCV 3.0.0, I have successfully build the source using CMake and Visual Studio 2013, when I am trying to build the...

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OpenCV4Android - calcCovarMatrix for image averages

April 13, 2016, 2:13 pm

So I have two RBG averages that I want to get a Mahalanobis distance for but the Mahalanobis function requires an inverse co-variance matrix. My question is how do I create a inverse co-variance matric...

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Error when tring to train image with opencv and android

April 14, 2016, 3:18 am

public class MainActivity extends Activity { Button button; ImageView res4; TextView T1; private static final String TAG = "training"; private BaseLoaderCallback mLoaderCallBack = new...

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debugging opencv python eclipse

April 14, 2016, 10:50 am

I have installed cv2 via pip install cv2 for python2.7. I ran the example programs, for example capturing a video from the webcam etc. and it works fine. As far as I know, one needs the C++ libraries...

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How to train correctly a cascade

April 14, 2016, 11:54 am

Hi I've been triying of training a cascade in OpenCV to identify mouths using LBP. I cut the mouths of 10 images facial. The images look like as this: ![image...

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How to put a label of type string in a matrix (KNN)

April 15, 2016, 4:59 am

This line put a label for a trainData mat train_labels.push_back(new Mat (1,1,CvType.CV_32FC1,new Scalar(i))) I would put a string label instead of a float label .is it possible ?

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Install opencv 3.0.0 in linux RHEL with python2.7

April 15, 2016, 5:31 am

Hi All, Am trying to install opencv 3.0.0 with python 2.7.6 in virtual environment of Red Hat Enterprise Linux Server release 6.7 (Santiago). when am trying to install image I/O packages using...

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Specular Highlights detection

April 15, 2016, 9:44 am

Hi guys, I am interested to find a way to detect and remove the specularities from a given indoors image. For example give the following image: ![image description](/upfiles/14607367432299179.png) you...

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emotion classification with SVM

April 16, 2016, 6:28 am

Hi, i'm working on a project where i have to extract the facial expression from a video, after i extracted the facial landmarks position i want to train SVM for emotion classification(happiness,...

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Access Image pixels' value OpenCV, C++

April 16, 2016, 5:54 pm

Hello all, I am trying to access color image pixels' values an somehow process them. Here is what I am trying to do: 1. I have two color images I1 & I2 (same size images). 2. I would like to...

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