如何在EmguCV C＃代码中加速此图像匹配代码？

Question

Here's the code. See the commented line for where possible optimization could be (at the foreach ). Anyone have suggestions on improving the speed here?

public void FindMatches(Matrix<float> dbDescriptors, Matrix<float> queryDescriptors, ref IList<IndecesMapping> imap)
    {
        var indices = new Matrix<int>(queryDescriptors.Rows, 2); // matrix that will contain indices of the 2-nearest neighbors found
        var dists = new Matrix<float>(queryDescriptors.Rows, 2); // matrix that will contain distances to the 2-nearest neighbors found

        // create FLANN index with 4 kd-trees and perform KNN search over it look for 2 nearest neighbours
        var flannIndex = new Index(dbDescriptors, 4);
        flannIndex.KnnSearch(queryDescriptors, indices, dists, 2, 24);

        for (int i = 0; i < indices.Rows; i++)
        {
            // filter out all inadequate pairs based on distance between pairs
            if (dists.Data[i, 0] < (0.5 * dists.Data[i, 1]))
            {
                // find image from the db to which current descriptor range belongs and increment similarity value.
                // in the actual implementation this should be done differently as it's not very efficient for large image collections.
                foreach (var img in imap)
                {
                    if (img.IndexStart <= indices[i, 0] && img.IndexEnd >= indices[i, 0])
                    {
                        img.Similarity++;
                        break;
                    }
                }
            }
        }
    }

Answer 1

You can improve your work by changing foreach loop as following:

 foreach (var img in imap)
            {
                if (img.IndexStart <= indices[i, 1] && img.IndexEnd >= indices[i, 1])
                {
                    img.Similarity++;
                    break;
                }
            }

Then it is working fine