// *****************************************************************
// 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_HoughLines2;

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

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

const
  filename = cResourceMedia + 'opencv_logo_with_text_sm.png';

var
  src: pIplImage = Nil;
  dst: pIplImage = Nil;
  color_dst: pIplImage = Nil;
  storage: pCvMemStorage;
  i: Integer;
  lines: pCvSeq;
  line: pCvPointArray;

begin
  try
    // получаем картинку (в градациях cерого)
    src := cvLoadImage(filename, CV_LOAD_IMAGE_GRAYSCALE);
    WriteLn(Format('[i] image: %s', [filename]));

    // хранилище памяти для хранения найденных линий
    storage := cvCreateMemStorage(0);
    lines := nil;
    i := 0;

    dst := cvCreateImage(cvGetSize(src), 8, 1);
    color_dst := cvCreateImage(cvGetSize(src), 8, 3);

    // детектирование границ
    cvCanny(src, dst, 50, 200, 3);

    // конвертируем в цветное изображение
    cvCvtColor(dst, color_dst, CV_GRAY2BGR);

    // нахождение линий
    lines := cvHoughLines2(dst, storage, CV_HOUGH_PROBABILISTIC, 1, CV_PI / 180, 50, 50, 10);

    // нариcуем найденные линии
    for i := 0 to lines^.total - 1 do
    begin
      line := pCvPointArray(cvGetSeqElem(lines, i));
      cvLine(color_dst, line^[0], line^[1], CV_RGB(255, 0, 0), 3, CV_AA, 0);
    end;

    // показываем
    cvNamedWindow('Source', 1);
    cvShowImage('Source', src);

    cvNamedWindow('Hough', 1);
    cvShowImage('Hough', color_dst);

    // ждём нажатия клавиши
    cvWaitKey(0);

    // оcвобождаем реcурcы
    cvReleaseMemStorage(storage);
    cvReleaseImage(src);
    cvReleaseImage(dst);
    cvReleaseImage(color_dst);
    cvDestroyAllWindows();
  except
    on E: Exception do
      WriteLn(E.ClassName, ': ', E.Message);
  end;

end.