// *****************************************************************
// 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_CreateFGDStatModel;

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

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

var
  k: Integer;
  fr: Integer;
  tmp_frame: pIplImage;
  cap: PCvCapture;
  update_bg_model: Boolean;
  bg_model: pCvBGStatModel;
  t, learningRate: double;

begin
  try
    update_bg_model := true;
    cap := cvCreateCameraCapture(CV_CAP_ANY);
    Assert(Assigned(cap));
    cvNamedWindow('Original', 1);
    cvNamedWindow('BG', 1);
    cvNamedWindow('FG', 1);

    bg_model := NIL;
    fr := 1;
    tmp_frame := cvQueryFrame(cap);
    while tmp_frame <> NIL do
    begin
      cvShowImage('Original', tmp_frame);
      if (bg_model = NIL) then
      begin
        // create BG model
        bg_model := cvCreateFGDStatModel(tmp_frame);
      end
      else
      begin
        t := cvGetTickCount();
        if (update_bg_model) then
          learningRate := -1
        else
          learningRate := 0;

        cvUpdateBGStatModel(tmp_frame, bg_model, learningRate);
        t := cvGetTickCount - t;

        Writeln(format('%d. %.1f', [fr, t / (cvGetTickFrequency * 1000.0)]));

        cvShowImage('BG', bg_model^.background);
        cvShowImage('FG', bg_model^.foreground);
      end;
      k := cvWaitKey(5);
      if (k = 27) then
        break;
      if (k = ord(' ')) then
        update_bg_model := Not update_bg_model;
      tmp_frame := cvQueryFrame(cap);
      Inc(fr);
    end;
    cvReleaseBGStatModel(bg_model);
    cvReleaseCapture(cap);
    cvDestroyAllWindows;
  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;

end.