Rauluka's profile - activity

Yes, that's true. Unfortunately MatOfFloat while using dump() outpust e.g. [1,2,3] and it's size 1x3, co it is confusing. I did have to transponse it first.

I have a problem with adding rows to Mat. I use push_back method but I get error: Sizes of input arguments do not match. Of course my Mats have same column length as it is said in method description.

Mat test = new Mat(new Size(10,100),5);
Mat row = new Mat(new Size(1,100),5);
test.push_back(row);

^It will result in error which I described above. Do you have any ideas how insert a row to a matrix?

A minute ago I checked that it falls when I have image files and folder in the same input folder(with samples) so it seems that is the issue (my bad). Thank you for your quick answer:)

As you wish ^ These are standard parameters for HOG. I tried different combinations of parameters but I stillget jni error.

I use java version of opencv and I want to compute HOG by using hog.compute. The problem is that I get: java.lang.Exception: Unknown exception in JNI code {objdetect::compute_10()} at org.opencv.objdetect.HOGDescriptor.compute_0(Native Method)

I would be grateful if someone could help.

The code:

protected void computeFeature(Mat imgSample,
        HashMap<String, Double> features, Mat mask) {

    HOGDescriptor hog = new HOGDescriptor(new Size(128, 64), new Size(16,
            16), new Size(8, 8), new Size(8, 8), 9, 0, -1,0, 0.2, false, 64);

    Imgproc.resize(imgSample, imgSample, new Size(128, 64));
    MatOfFloat z = new MatOfFloat();

    hog.compute(imgSample, z);

}

It would be nice if more Highgui package method were implemented in Java version. It is quite irritating (and not very efficient) when you have to use other libraries and solutions to make it work.

It seems it's the only way to do it. Thanks for your time:)

You can't pass parameter of a different type in Java. Method open is not applicable for String type parameter, it won't compile. That's the problem of this package;/ I can read camera input, get frames, save them etc. But still can't open a video file;/

oc I read this example, but there is no method that takes a filename, stream as a parameter. Method open takes only int id, and it's a device id (camera). If you managed to open a video file using this package I would be grateful for example.

Thanks for reply:) I have found VideoCapture package, but it doesn't have method (like cvCapturefromAvi), you can only open a stream from a camera (method takies int parameter of a device, not a file name). If I misunderstood something I' sorry;)

I'm trying to load video file using desktop Java opencv, but it seems VideoCapture and other packages doesn't have appropriate methods. Do you have some ideas how to load video file?