I am using Android studio with OpenCV sdk 3.2 version. I am trying to train using readymade API available for SVM
Part of my code retrieves the image from the internal memory of the phone, and helps to train using SVM
File mnist_images_file = new File(path);
FileInputStream images_reader = new FileInputStream(mnist_images_file);
Mat training_images = null;
try {
...
training_images = new Mat(total_images, px_count, CvType.CV_8U);
for (int i = 0; i < total_images; i++) {
byte[] image = new byte[px_count];
images_reader.read(image, 0, px_count);
training_images.put(i, 0, image);
}
training_images.convertTo(training_images,
CvType.CV_32FC1);
//Read Labels
Mat training_labels = null;
byte[] labels_data = new byte[total_images];
File mnist_labels_file = new File(labels_path);
FileInputStream labels_reader = new
FileInputStream(mnist_labels_file);
try{
training_labels = new Mat(total_images, 1,
CvType.CV_8U);
Mat temp_labels = new Mat(1, total_images,
CvType.CV_8U);
header = new byte[8];
//Read the header
labels_reader.read(header, 0, 8);
//Read all the labels at once
labels_reader.read(labels_data,0,total_images);
temp_labels.put(0,0, labels_data);
//Take a transpose of the image
Core.transpose(temp_labels, training_labels);
training_labels.convertTo(training_labels,
CvType.CV_32FC1);
labels_reader.close();
}
catch (IOException e)
{
Log.i("MNIST Read Error:", "" + e.getMessage());
}
images_reader.close();
SVM svm = SVM.create();
svm.setType(SVM.C_SVC);
svm.setKernel(SVM.POLY);
svm.setGamma(3);
svm.train(training_images, Ml.ROW_SAMPLE,training_labels);
I am trying to train using available dataset that is already present in the device in the form of images . but calling this train() gives me the following error:
03-01 17:10:24.359 12035-12035/com.example.vankit.knnexample E/cv::error(): OpenCV Error: One of arguments' values is out of range (The kernel parameter must be positive) in void cv::ml::SVMImpl::checkParams(), file /home/maksim/workspace/android-pack/opencv/modules/ml/src/svm.cpp, line 1302 03-01 17:10:24.361 12035-12035/com.example.vankit.knnexample E/org.opencv.ml: ml::train_10() caught cv::Exception: /home/maksim/workspace/android-pack/opencv/modules/ml/src/svm.cpp:1302: error: (-211) The kernel parameter must be positive in function void cv::ml::SVMImpl::checkParams() 03-01 17:10:24.362 12035-12035/com.example.vankit.knnexample E/AndroidRuntime: FATAL EXCEPTION: main
Could you please suggest a way out for this?
