Andriy's profile - activity

I'm using OpenCV with support for Java Desktop. I'm trying to match key points of two different images with DescriptorMatcher. Then I'm applying the Good Matches check and everything works fine. But I've noticed that exists another methodology to eliminate bad matches, the name of which is Cross Check.

1) Is it possible to activate it on definition of matcher?

I've also tried to create my own function, that performs the Cross Check, but something is wrong my code as it returns only 1 match.

2) What can be wrong in the following code?

DescriptorMatcher matcherknn = DescriptorMatcher.create(DescriptorMatcher.FLANNBASED);
matcherknn.match(d1,d2, matchesknn12);
matcherknn.match(d2,d1, matchesknn21);
List <DMatch> matches12 = matchesknn12.toList();
List <DMatch> matches21 = matchesknn21.toList();
List <DMatch> filteredMatches = new ArrayList<DMatch>();

for( int fk = 0; fk < matches12.size(); fk++ )
{
    DMatch forward = matches12.get(fk);    
    DMatch backward = matches21.get(forward.trainIdx);
    if( backward.trainIdx != forward.queryIdx ){
        filteredMatches.add(forward);
        break;
    }

}

Hi, I have installed OpenCV 2.4.4 with support for Java Desktop from executable file. So i haven't compiled the OpenCV source. When I'm trying to run my project, I'm getting the next error

major version 51 is newer than 50, the highest major version supported by this compiler

As I'have understood, the OpenCV that I have installed was previously compiled by with java 7. Am I right? So I have to migrate for java 7 too? Is there OpenCV 2.4.4 for java 6 without need of compiling source?

Looks like I had a bad-formated yml file, because I've tried same thing with xml file and it worked.

@homegate Check your network configuration, maybe there is some proxy that is blocking the access

The version which I've installed doesn't include OpenCVTestRunner.java, because It is not Android OpenCV. It is a new version of OpenCV with support for Java desktop applications.

Rui, I have to create yml file by my own, because I can't import package org.opencv.test. Is it possible to know if extractor.read(filename); failed? I'm asking it because I can't see any changes in results, neither exceptions.

As it says in the documentation, in OpenCV there is a constructor called ORB, where I can specify a lot of parameters. But I'm using Java and I can't find how to specify those parameters. All I can to is to initialize detector with:

FeatureDetector detector = FeatureDetector.create(FeatureDetector.ORB);

So how I can specify parameters from the documentation? Is there another way to initialize ORB feature detector in Java? Thanks.

Hello I'm getting next exception when trying to run java project that uses opencv libraries:

Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at org.opencv.highgui.Highgui.<clinit>(Highgui.java:416)
at teste.main(teste.java:21)

Can it be caused of wrong installation of opencv? Or maybe some import is missing? I'm trying to follow instructions from here. Also I'm using Windows 7 and I want to create a simple Java project in Eclipse(not Android)

• So I've extracted javacv from OpenCV-2.4.2.exe file to C:\
• Then executed "cmake -G "MinGW Makefiles" -DBUILD_opencv_java=ON C:\opencv" command and after that, "mingw32-make". Everything was build without errors or warnings
• After I've added opencv dll's to my Environment Variables

Thanks for your attention

Looks like the network to which I was connected was blocking access to repository. After connecting to another network I didn't get this error anymore. But still don't understand how I insert public key in my acconunt page. Is this step useless?

Hello,

I'm trying to clone opencv's git repository. I'm following stepts from here. But I'm stack on this point:

• Copy contents of the file id_rsa.pub to the Key field on the http://code.opencv.org/my/account page. Press Create.

Because on my account page there is no option to input RSA key with "Create" button. And when I'm clonning repository I'm getting next error:

fatal: unable to connect to code.opencv.org:
code.opencv.org[0: 5.9.49.245]: errno=No error

So how can I solve this problem? Thanks