| public KnnSearch ( Mat queries, Mat indices, Mat dists, int knn, OpenCvSharp.Flann.SearchParams @params ) : void | ||
| queries | Mat | The query points, one per row |
| indices | Mat | Indices of the nearest neighbors found |
| dists | Mat | Distances to the nearest neighbors found |
| knn | int | Number of nearest neighbors to search for |
| @params | OpenCvSharp.Flann.SearchParams | |
| return | void | |
public void Run()
{
Console.WriteLine("===== FlannTest =====");
// creates data set
using (var features = new Mat(10000, 2, MatType.CV_32FC1))
{
var rand = new Random();
for (int i = 0; i < features.Rows; i++)
{
features.Set<float>(i, 0, rand.Next(10000));
features.Set<float>(i, 1, rand.Next(10000));
}
// query
var queryPoint = new Point2f(7777, 7777);
var queries = new Mat(1, 2, MatType.CV_32FC1);
queries.Set<float>(0, 0, queryPoint.X);
queries.Set<float>(0, 1, queryPoint.Y);
Console.WriteLine("query:({0}, {1})", queryPoint.X, queryPoint.Y);
Console.WriteLine("-----");
// knnSearch
using (var nnIndex = new Index(features, new KDTreeIndexParams(4)))
{
const int Knn = 1;
int[] indices;
float[] dists;
nnIndex.KnnSearch(queries, out indices, out dists, Knn, new SearchParams(32));
for (int i = 0; i < Knn; i++)
{
int index = indices[i];
float dist = dists[i];
var pt = new Point2f(features.Get<float>(index, 0), features.Get<float>(index, 1));
Console.Write("No.{0}\t", i);
Console.Write("index:{0}", index);
Console.Write(" distance:{0}", dist);
Console.Write(" data:({0}, {1})", pt.X, pt.Y);
Console.WriteLine();
}
}
}
Console.Read();
}
public override void RunTest()
{
Console.WriteLine("===== FlannTest =====");
// creates data set
using (var features = new Mat(10000, 2, MatType.CV_32FC1))
{
var rand = new Random();
for (int i = 0; i < features.Rows; i++)
{
features.Set <float>(i, 0, rand.Next(10000));
features.Set <float>(i, 1, rand.Next(10000));
}
// query
var queryPoint = new Point2f(7777, 7777);
var queries = new Mat(1, 2, MatType.CV_32FC1);
queries.Set <float>(0, 0, queryPoint.X);
queries.Set <float>(0, 1, queryPoint.Y);
Console.WriteLine("query:({0}, {1})", queryPoint.X, queryPoint.Y);
Console.WriteLine("-----");
// knnSearch
using var nnIndex = new OpenCvSharp.Flann.Index(features, new KDTreeIndexParams(4));
const int Knn = 1;
nnIndex.KnnSearch(queries, out int[] indices, out float[] dists, Knn, new SearchParams(32));
for (int i = 0; i < Knn; i++)
{
int index = indices[i];
float dist = dists[i];
var pt = new Point2f(features.Get <float>(index, 0), features.Get <float>(index, 1));
Console.Write("No.{0}\t", i);
Console.Write("index:{0}", index);
Console.Write(" distance:{0}", dist);
Console.Write(" data:({0}, {1})", pt.X, pt.Y);
Console.WriteLine();
}
}
Console.Read();
}