delphi xe opencv 人脸识别代码

以下是基于 Delphi XE 和 OpenCV 的简单人脸识别代码：

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ExtCtrls, Vcl.StdCtrls, Vcl.Imaging.jpeg,
  OpenCV.Core, OpenCV.ImgProc, OpenCV.HighGUI, OpenCV.ObjDetect, OpenCV.Video;

type
  TForm1 = class(TForm)
    Image1: TImage;
    Timer1: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
    cascade: pCvHaarClassifierCascade;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
  filename: string;
begin
  // 加载人脸识别级联分类器
  filename := 'haarcascade_frontalface_alt.xml';
  cascade := cvLoadHaarClassifierCascade(PAnsiChar(AnsiString(filename)), cvSize(0, 0));

  // 启动定时器
  Timer1.Enabled := True;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
  capture: pCvCapture;
  frame: pIplImage;
  gray: pIplImage;
  storage: pCvMemStorage;
  faces: pCvSeq;
  i: Integer;
  rect: TCvRect;
  image: TBitmap;
begin
  // 打开摄像头
  capture := cvCreateCameraCapture(0);
  try
    // 获取一帧图像
    frame := cvQueryFrame(capture);
    if Assigned(frame) then
    begin
      // 转换为灰度图像
      gray := cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 1);
      try
        cvCvtColor(frame, gray, CV_BGR2GRAY);

        // 进行人脸识别
        storage := cvCreateMemStorage(0);
        try
          faces := cvHaarDetectObjects(gray, cascade, storage, 1.2, 2, CV_HAAR_DO_CANNY_PRUNING, cvSize(50, 50));
          try
            // 在图像中绘制人脸矩形
            image := TBitmap.Create;
            try
              image.Width := frame.width;
              image.Height := frame.height;
              cvCvtColor(frame, gray, CV_BGR2RGB);
              image.Canvas.Draw(0, 0, image);
              for i := 0 to faces.total - 1 do
              begin
                rect := pCvRect(cvGetSeqElem(faces, i))^;
                image.Canvas.Brush.Style := bsClear;
                image.Canvas.Pen.Color := clRed;
                image.Canvas.Pen.Width := 2;
                image.Canvas.Rectangle(rect.x, rect.y, rect.x + rect.width, rect.y + rect.height);
              end;
              Image1.Picture.Bitmap.Assign(image);
            finally
              image.Free;
            end;
          finally
            cvClearSeq(faces);
          end;
        finally
          cvReleaseMemStorage(@storage);
        end;
      finally
        cvReleaseImage(@gray);
      end;
    end;
  finally
    cvReleaseCapture(@capture);
  end;
end;

end.

这个代码使用 Delphi XE 和 OpenCV，通过摄像头实时获取图像，进行人脸识别，并在图像中绘制人脸矩形。请注意，需要将 `haarcascade_frontalface_alt.xml` 文件放在同一目录下。