如何使用Java在CascadeCalssifier中設置裁剪大小

Question

public BufferedImage detectAndDisplay(BufferedImage img, CascadeClassifier faceCascade) {
    Mat frameGray = new Mat();
    BufferedImage imgout = null;

    Mat image = ImagePreProcessing.bufferedImageToMat(img);

    // -- Detect faces
    MatOfRect faces = new MatOfRect();
    faceCascade.detectMultiScale(image, faces);

    List<Rect> listOfFaces = faces.toList();
    for (Rect face : listOfFaces) {
        Point center = new Point(face.x + face.width / 2, face.y + face.height / 2);
        Imgproc.ellipse(image, center, new Size(face.width / 2, face.height / 2), 0, 0, 360,
                new Scalar(255, 0, 255), 3);

        Mat faceROI = image.submat(face);
        imgout = ImagePreProcessing.Mat2BufferedImage(faceROI);
        System.out.println("OpenCV: " +center);

    }
    return imgout;
}

該代碼我有..但是我不知道設置裁剪輸出圖像的代碼在哪里。 我想擁有帶有圓圈模板的原始版本的圖片。不要被剪裁，請給我建議：）

輸入：

輸出：

Answer 1

在您的代碼中，您返回了原始圖像的裁剪圖像，因此，如果您想要原始圖像，請繪制圓並將其轉換為BufferedImage並返回。

for (Rect face : listOfFaces) {
        Point center = new Point(face.x + face.width / 2, face.y + face.height / 2);
        Imgproc.ellipse(image, center, new Size(face.width / 2, face.height / 2), 0, 0, 360,
                new Scalar(255, 0, 255), 3);

        // dot not crop!!!
        /*Mat faceROI = image.submat(face);
        imgout = ImagePreProcessing.Mat2BufferedImage(faceROI);*/

        System.out.println("OpenCV: " +center);
        imgout = ImagePreProcessing.Mat2BufferedImage(image);

    }