// *****************************************************************
// Delphi-OpenCV Demo
// Copyright (C) 2013 Project Delphi-OpenCV
// ****************************************************************
// Contributor:
// Laentir Valetov
// email:laex@bk.ru
// ****************************************************************
// You may retrieve the latest version of this file at the GitHub,
// located at git://github.com/Laex/Delphi-OpenCV.git
// ****************************************************************
// The contents of this file are used with permission, subject to
// the Mozilla Public License Version 1.1 (the "License"); you may
// not use this file except in compliance with the License. You may
// obtain a copy of the License at
// http://www.mozilla.org/MPL/MPL-1_1Final.html
//
// Software distributed under the License is distributed on an
// "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
// implied. See the License for the specific language governing
// rights and limitations under the License.
// *******************************************************************

program cv_GoodFeaturesToTrack;

{$APPTYPE CONSOLE}
{$R *.res}

uses
  System.SysUtils,
  ocv.highgui_c,
  ocv.core_c,
  ocv.core.types_c,
  ocv.imgproc_c,
  ocv.imgproc.types_c,
  uResourcePaths;

Const
  ImgFilename = cResourceMedia + 'pic5.bmp';

type
  TPointsArr = array [0 .. 250] of TCvPoint2D32f;
  PPointsArr = ^TPointsArr;

var
  img1, img2, eig, temp: PIplImage;

  points: array [0 .. 1] of PPointsArr;
  pointsRow1: TPointsArr;
  ipar1, count, j: integer;

begin
  try
    ipar1 := 100;
    img1 := cvLoadImage(ImgFilename, CV_LOAD_IMAGE_UNCHANGED);
    img2 := cvCreateImage(cvGetSize(img1), IPL_DEPTH_8U, 1);
    cvCvtColor(img1, img2, CV_RGB2GRAY);
    eig := cvCreateImage(cvGetSize(img2), 32, 1);
    temp := cvCreateImage(cvGetSize(img2), 32, 1);

    points[0] := @pointsRow1[0];
    count := 250;
    cvGoodFeaturesToTrack(img2, eig, temp, @points[0][0], @ipar1, 0.05, 10, nil, 5, 0, 0.09);
    cvFindCornerSubPix(img2, @points[0][0], count, cvSize(5, 5), cvSize(-1, -1),
      cvTermCriteria(CV_TERMCRIT_ITER or CV_TERMCRIT_EPS, 20, 0.03));
    for j := 0 to ipar1 - 1 do
    begin
      cvCircle(img1, cvPointFrom32f(points[0][j]), 3, CV_RGB(0, 255, 255), -1, 8, 0);
      cvCircle(img1, cvPointFrom32f(points[0][j]), 8, CV_RGB(255, 0, 0), -1, 8, 0);
    end;
    cvNamedWindow('bb', 1);
    cvShowImage('bb', img1);
    cvWaitKey(0);
    cvReleaseImage(img1);
    cvReleaseImage(img2);
    cvReleaseImage(eig);
    cvReleaseImage(temp);
    cvDestroyAllWindows;
  except
    on E: Exception do
      WriteLn(E.ClassName, ': ', E.Message);
  end;

end.