特徴点を表示したり遊んでみる

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using OpenCvSharp;
using OpenCvSharp.CPlusPlus;    // コレ
using System.Diagnostics;

namespace _03_matTest
{
    class Program
    {
        static void Main(string[] args)
        {
            /*
            CvMat mat1 = new CvMat(10, 10, MatrixType.U16C1);
            CvMat mat2 = new CvMat(320, 480, MatrixType.U8C3, new CvScalar(0,0,255));

            using (new CvWindow(mat2))
            {
                Debug.WriteLine(mat2.Width + " : " + mat2.Height);
                Debug.WriteLine(mat2.ElemDepth + " : " + mat2.ElemType);
                Cv.WaitKey();
            }
            */

            Mat matImage = new Mat(@"C:\Users\hogehoge\\Pictures\hogehoge.jpg");
            Mat grayImage = new Mat();
            Cv2.CvtColor(matImage, grayImage, ColorConversion.RgbToGray);

            /*
            var indexer = matImage.GetGenericIndexer<Vec3b>();
            var px = indexer[5, 5];
            Debug.WriteLine(px[0] + ":" + px[1] + ":" + px[2]);
            px[0] = 0;      // B
            px[1] = 0;      // G
            px[2] = 255;    // R
            indexer[5, 5] = px;

            // var type = matImage.Type;
            using (new Window("photo", matImage))   // ウィンドウを作成して画像を表示
            */
            CvSize size = new CvSize(matImage.Width / 8, matImage.Height / 8);
            Mat dispImage = new Mat();

            Cv2.Resize(matImage, dispImage, size);
            using (new Window("resized image", dispImage))
            {
                Cv.WaitKey();
            }

            Mat copyImage = dispImage.Clone(new Rect(0, 0, matImage.Width / 8, matImage.Height / 8));      // 画像をコピー(というかcloneなのでポインタではなく深い)
            Mat bwImage = copyImage.Clone();

            Cv2.CvtColor(bwImage, bwImage, ColorConversion.RgbToGray);
            KeyPoint[] keypoints;
            // Cv2.FAST(bwImage, out keypoints, 50, true);     // FAST : cornerを検出する    桜の場合はコーナーだらけ
            // Cv2.FAST(bwImage, out keypoints, 50, true);      // 建物 : まあまあ
            //  Cv2.FAST(bwImage, out keypoints, 20, true);         // 建物 : やや増える
            Cv2.FAST(bwImage, out keypoints, 100, true);         // 建物 : 減る

            foreach (KeyPoint kp in keypoints)
            {
                dispImage.Circle(kp.Pt, 3, Scalar.Red, -1, LineType.AntiAlias, 0);
            }

            using (new Window("copy image", dispImage))
            {
                Cv2.WaitKey();
            }

            /*
            using (new Window("gray image", grayImage))
            {
                Debug.WriteLine(grayImage.Width + " : " + grayImage.Height);        // 4896 : 3264
                Debug.WriteLine(grayImage.Depth() + " : " + grayImage.Type());      //    0 : CV_8UC1
                Cv.WaitKey();
            }
            */
        }
    }
}