BOWImgDescriptorExtractor.Compute -> Send KeyPoints

I hope this is not a silly request but, I have a feeling that there is something wrong with the definition of BOWImgDescriptorExtractor.Compute method. KeyPoints are defined as out. How will we send the key points then? In EMGU it is not defined like that.

I could not able to get a result with the Compute method. The descriptor output is always empty:

DescriptorMatcher matcher = new FlannBasedMatcher();//nearest neighbor matcher
                BOWImgDescriptorExtractor bowDE = new BOWImgDescriptorExtractor(featureDetector, matcher);
                bowDE.SetVocabulary(this.Vocabulary);

                Mat samples; Mat responses;
                SVMHelper.GetTrainingData(class_mats, out samples, out responses, (mat) =>
                {
                    Mat desc0 = new Mat();
                    KeyPoint[] kp = featureDetector.Detect(mat, null);

                    int[][] pnts;
                    bowDE.Compute(mat, out kp, desc0, out pnts);
                    //bowDE.Compute(mat, desc0, out pnts);
                    //bowDE.Compute2(mat, out kp, desc0);

                    return desc0;
                }, null);

[korhun]

Shimat thank you very much for spending your valuable time for my questions. But I couldn’t manage to update with this link. I am using Visual Studio 2015, and update using Package Manager Console (Install-Package OpenCvSharp3-AnyCPU -Version 3.2.0.20170126 for example) I coun’t find how to update with https://ci.appveyor.com/nuget/opencvsharp

BTW: I am very happy with using OpenCVSharp. Thank to everyone that is involved on this great project.

[shimat]

Please try this command.

PM> Install-Package OpenCvSharp3-AnyCPU -Source https://ci.appveyor.com/nuget/opencvsharp -IncludePrerelease