OpenCv霍夫圆变换(cvHoughCircles)测试程序

为了更好的测试OpenCV中cvHoughCircles函数的功能和各个参数作用,使用Delphi生成了一个工程,利用Trackbar调整各个参数,每次调整都调用一次cvHoughCircles函数比便于对比参数的效果.OpenCV作为开源项目,文档不够详细,每个函数的参数都只是做了简要的说明,在不同的实际应用中,有必要对函数中的每个参数进行系统测试,才能得到自己能体会的作用.

unit MainForm;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls;

type
  TFrmMain = class(TForm)
    BtnHouphCircle: TButton;
    TrackBar1: TTrackBar;
    Label1: TLabel;
    TrackBar2: TTrackBar;
    Label2: TLabel;
    TrackBar3: TTrackBar;
    Label3: TLabel;
    TrackBar4: TTrackBar;
    Label4: TLabel;
    TrackBar5: TTrackBar;
    Label5: TLabel;
    TrackBar6: TTrackBar;
    Label6: TLabel;
    TrackBar7: TTrackBar;
    Label7: TLabel;
    TrackBar8: TTrackBar;
    Label8: TLabel;
    EdtPicture: TEdit;
    Label9: TLabel;
    BtnPictureFile: TButton;
    procedure BtnHouphCircleClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure TrackBar1Change(Sender: TObject);
    procedure BtnPictureFileClick(Sender: TObject);
  private
    procedure DoHoughCircle;
  public
    { Public declarations }
  end;

var
  FrmMain: TFrmMain;

implementation

uses IPL, OpenCV;

{$R *.dfm}

procedure TFrmMain.BtnHouphCircleClick(Sender: TObject);
var
  sFileName: string;
  img: PIplImage;
  storage: PCvMemStorage;
  seq: PCvSeq;
  i: Integer;
  p: PFloat;
  x, y, radiu: Integer;
  pt: CvPoint;
  pc: PChar;
begin
  if EdtPicture.Text = '' then Exit;
  sFileName := EdtPicture.Text;
  img := cvLoadImage(PChar(sFileName), CV_LOAD_IMAGE_GRAYSCALE);
  cvNamedWindow('test', CV_WINDOW_AUTOSIZE );
  cvEqualizeHist(img, img);//直方图均衡化后效果更好
  storage := cvCreateMemStorage(0);
  //cvCanny(img, img, 90, 120);
  //cvSmooth(img, img);
  cvSaveImage('c:\1.jpg', img);
  seq := cvHoughCircles(img, storage, CV_HOUGH_GRADIENT,
    TrackBar1.Position, //累加分辨率 1表示与源图像相同 2表示比源图像小两倍   3
    TrackBar2.Position, //圆心间的最小距离      10
    TrackBar3.Position, //第一个方法的相关参数      13
    TrackBar4.Position,//第二个方法的相关参数       76
    TrackBar5.Position,  //圆弧最小半径             5
    TrackBar6.Position);//圆弧最大半径              9
  for i := 0 to seq.total - 1 do
  begin
    pc := cvGetSeqElem(seq, i);
    p := PFloat(pc);
    x := cvRound(p^);
    Inc(p);
    y := cvRound(p^);
    Inc(p);
    radiu :=cvRound(p^);
    pt := cvPoint_(x, y);
    cvCircle(img, pt, radiu, CV_RGB($FF, $FF, $FF), 2);
  end;
  cvShowImage('test', img);
end;

procedure TFrmMain.BtnPictureFileClick(Sender: TObject);
begin
  with TOpenDialog.Create(Self) do
  begin
    try
      InitialDir := ExtractFilePath(ParamStr(0)) + '..\Data';
      if Execute then
        EdtPicture.Text := FileName;
    finally
      Free;
    end;
  end;
end;

procedure TFrmMain.DoHoughCircle;
var
  sFileName: string;
  img: PIplImage;
  storage: PCvMemStorage;
  seq: PCvSeq;
  i: Integer;
  p: PFloat;
  x, y, radiu: Integer;
  pt: CvPoint;
  pc: PChar;
begin
  if EdtPicture.Text = '' then Exit;
  sFileName := EdtPicture.Text;
  img := cvLoadImage(PChar(sFileName), CV_LOAD_IMAGE_GRAYSCALE);
  cvShowImage('test', img);
  storage := cvCreateMemStorage(0);
  //cvCanny(img, img, TrackBar7.Position, TrackBar8.Position);
  cvSaveImage('c:\1.jpg', img);
  seq := cvHoughCircles(img, storage, CV_HOUGH_GRADIENT,
    TrackBar1.Position, //累加分辨率 1表示与源图像相同 2表示比源图像小两倍   3
    TrackBar2.Position, //圆心间的最小距离      10
    TrackBar3.Position, //第一个方法的相关参数      13
    TrackBar4.Position,//第二个方法的相关参数       76
    TrackBar5.Position,  //圆弧最小半径             5
    TrackBar6.Position);//圆弧最大半径              9
  for i := 0 to seq.total - 1 do
  begin
    pc := cvGetSeqElem(seq, i);
    p := PFloat(pc);
    x := cvRound(p^);
    Inc(p);
    y := cvRound(p^);
    Inc(p);
    radiu :=cvRound(p^);
    pt := cvPoint_(x, y);
    cvCircle(img, pt, radiu, CV_RGB($FF, $FF, $FF), 2);
  end;
  cvShowImage('test', img);
  cvReleaseMemStorage(storage);
  cvReleaseImage(img);
end;

procedure TFrmMain.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  {cvReleaseMemStorage(storage);
  cvReleaseImage(img);
  cvDestroyWindow('test'); }
end;

procedure TFrmMain.TrackBar1Change(Sender: TObject);
begin
  DoHoughCircle;
end;

end.