(* /*****************************************************************
  //                       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.
  ******************************************************************* *)
// JCL_DEBUG_EXPERT_GENERATEJDBG OFF
// JCL_DEBUG_EXPERT_INSERTJDBG OFF
// JCL_DEBUG_EXPERT_DELETEMAPFILE OFF
program cv_GoodFeaturesToTrack_Video;

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

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

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

var
  img1, img2, img3, eig, temp: PIplImage;

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

begin
  try
    capture := cvCreateCameraCapture(CV_CAP_ANY);
    if not Assigned(capture) then
      Halt;
    ipar1 := 10;
    while true do
    begin
      // получаем кадр
      img3 := cvQueryFrame(capture);
      img2 := cvCreateImage(cvGetSize(img3), IPL_DEPTH_8U, 1);
      img1 := cvCloneImage(img3);
      cvCvtColor(img3, 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]), 2, CV_RGB(0, 255, 255), -1, 8, 0);
        cvCircle(img1, cvPointFrom32f(points[0][j]), 4, CV_RGB(255, 0, 0), -1, 8, 0);
      end;
      cvNamedWindow('bb', 1);
      cvShowImage('bb', img1);
      c := cvWaitKey(33);
      if (c = 27) then
        Break
    end;
    cvReleaseImage(img1);
    cvReleaseImage(img2);
    cvReleaseImage(eig);
    cvReleaseImage(temp);
    cvReleaseCapture(capture);
    cvDestroyAllWindows;
  except
    on E: Exception do
      WriteLn(E.ClassName, ': ', E.Message);
  end;

end.