使用OpenImaj - LAPACK错误的渔面: DSYGVD返回40

Question

我试图使用OpenImaj来处理渔人界面，但是下面的代码会导致以下错误：

线程"main“中的异常: LAPACK错误: DSYGVD在org.openimaj.math.matrix.GeneralisedEigenvalueProblem.sygvd(GeneralisedEigenvalueProblem.java:57) at org.openimaj.math.matrix.GeneralisedEigenvalueProblem.symmetricGeneralisedEigenvectorsSorted(GeneralisedEigenvalueProblem.java:221) at org.openimaj.math.matrix.algorithm.LinearDiscriminantAnalysis.learnBasis(LinearDiscriminantAnalysis.java:211) at org.openimaj.image.model.FisherImages.train(FisherImages.java:195) at org.openimaj.image.model.FisherImages.train(FisherImages.java:159)返回40在org.openimaj.tutorial.facialanalysis.FisherfacesExample.main(FisherfacesExample.java:35)

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.vfs2.FileSystemException;
import org.openimaj.data.dataset.GroupedDataset;
import org.openimaj.data.dataset.ListDataset;
import org.openimaj.data.dataset.VFSGroupDataset;
import org.openimaj.experiment.dataset.split.GroupedRandomSplitter;
import org.openimaj.image.DisplayUtilities;
import org.openimaj.image.FImage;
import org.openimaj.image.ImageUtilities;
import org.openimaj.image.model.FisherImages;

public class FisherfacesExample {

    public static void main(String[] args) {
        try {
            // getting a set of face images
            VFSGroupDataset<FImage> dataset = new VFSGroupDataset<FImage>(
                    "zip:http://datasets.openimaj.org/att_faces.zip", ImageUtilities.FIMAGE_READER);

            // forming training set & testing set
            int nTraining = 1;
            int nTesting = 5;
            GroupedRandomSplitter<String, FImage> splits = new GroupedRandomSplitter<String, FImage>(dataset, nTraining,
                    0, nTesting);
            GroupedDataset<String, ListDataset<FImage>, FImage> training = splits.getTrainingDataset();
            GroupedDataset<String, ListDataset<FImage>, FImage> testing = splits.getTestDataset();

            // set number of components and train the training set of images
            int components = 50;
            FisherImages fisher = new FisherImages(components);
            fisher.train(training);

             //drawing the first 12 basis vectors
             List<FImage> fisherFaces = new ArrayList<FImage>();
             for (int i = 0; i < 12; i++) {
                 fisherFaces.add(fisher.visualise(i));
             }
             DisplayUtilities.display("FisherFaces", fisherFaces);

        } catch (FileSystemException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

你能告诉我问题出在哪里吗？在训练面部图像之前，我应该做些什么吗？谢谢。

Answer 1

这个错误几乎肯定是因为你试图用每堂课只有一个例子来训练。增加培训样本的数量，然后重试。

(技术原因: FisherFaces使用多类线性鉴别分析，这涉及到计算每个类的协方差矩阵；不能用每个类的单个样本正确计算)

Answer 2

增加训练图像的数量解决了错误。然而，还有另一个问题：

线程"main“中的异常:2在org.openimaj.image.model.FisherImages.getBasisVector(FisherImages.java:230) at org.openimaj.image.model.FisherImages.visualise(FisherImages.java:243) at org.openimaj.tutorial.facialanalysis.FisherfacesExample.main(FisherfacesExample.java:41)

组件数量的有意义的值是什么？谢谢。