FeatureExample

using UnityEngine;
using UnityEngine.SceneManagement;
using System.Collections;
using OpenCVForUnity.CoreModule;
using OpenCVForUnity.ImgprocModule;
using OpenCVForUnity.Features2dModule;
using OpenCVForUnity.UnityUtils;
using System.Collections.Generic;

namespace OpenCVForUnityExample
{
    /// <summary>
    /// Feature2D Example
    /// An example of descriptor extraction and descriptor matching.
    /// http://docs.opencv.org/3.1.0/d5/dde/tutorial_feature_description.html
    /// </summary>
    public class Feature2DExample : MonoBehaviour
    {
        // Use this for initialization
        void Update ()
        {
            Texture2D imgTexture = Resources.Load ("lena") as Texture2D;

            Mat img1Mat = new Mat (imgTexture.height, imgTexture.width, CvType.CV_8UC3);
            Utils.texture2DToMat (imgTexture, img1Mat);
            Debug.Log ("img1Mat.ToString() " + img1Mat.ToString ());

            Mat img2Mat = new Mat (imgTexture.height, imgTexture.width, CvType.CV_8UC3);
            Utils.texture2DToMat (imgTexture, img2Mat);
            Debug.Log ("img2Mat.ToString() " + img2Mat.ToString ());


            float angle = UnityEngine.Random.Range (0, 360), scale = 1.0f;

            Point center = new Point (img2Mat.cols () * 0.5f, img2Mat.rows () * 0.5f);

            Mat affine_matrix = Imgproc.getRotationMatrix2D (center, angle, scale);

            Imgproc.warpAffine (img1Mat, img2Mat, affine_matrix, img2Mat.size ());


            ORB detector = ORB.create ();
            ORB extractor = ORB.create ();

            MatOfKeyPoint keypoints1 = new MatOfKeyPoint ();
            Mat descriptors1 = new Mat ();

            detector.detect (img1Mat, keypoints1);
            extractor.compute (img1Mat, keypoints1, descriptors1);

            MatOfKeyPoint keypoints2 = new MatOfKeyPoint ();
            Mat descriptors2 = new Mat ();

            detector.detect (img2Mat, keypoints2);
            extractor.compute (img2Mat, keypoints2, descriptors2);


            DescriptorMatcher matcher = DescriptorMatcher.create (DescriptorMatcher.BRUTEFORCE_HAMMINGLUT);
            MatOfDMatch matches = new MatOfDMatch ();

            List<MatOfDMatch> knnMatches = new List<MatOfDMatch>();
            matcher.knnMatch (descriptors1, descriptors2, knnMatches, 2);

            var arrayKnnMatches = knnMatches.ToArray();
            List<DMatch> goodMatches = new List<DMatch>();
            for (int i = 0; i < arrayKnnMatches.Length; ++i)
            {
                var array = arrayKnnMatches[i].toArray();
                if (array[0].distance < 0.7 * array[1].distance)
                {
                    goodMatches.Add(array[0]);
                }
            }

            Mat resultImg = new Mat ();
            matches.fromArray(goodMatches.ToArray());

            Features2d.drawMatches (img1Mat, keypoints1, img2Mat, keypoints2, matches, resultImg);


            Texture2D texture = new Texture2D (resultImg.cols (), resultImg.rows (), TextureFormat.RGBA32, false);

            Utils.matToTexture2D (resultImg, texture);

            gameObject.GetComponent<Renderer> ().material.mainTexture = texture;
        }

        // Update is called once per frame


        /// <summary>
        /// Raises the back button click event.
        /// </summary>
        public void OnBackButtonClick ()
        {
            SceneManager.LoadScene ("OpenCVForUnityExample");
        }
    }
}