FaceRecognizerSF alignCrop method on the android is not work right

[tangzhezhi]

FaceRecognizerSF alignCrop method on the android is not work right.

FaceRecognizerSF alignCrop work right on the ubuntu when i compile in c++ but it not work on the android,

i test the opencv4.9.0 and opencv4.11.0 , it all not work right .

the android result not the same with result of the ubuntu .

the android result is not align person's face .

code like this :

faceRecognizerSF.alignCrop(image, faces.row(max_face_index) , aligned_face);

[fengyuentau]

I guess you missed Mat.clone().

See #187 (comment) and #195.

[tangzhezhi]

I guess you missed Mat.clone().

See #187 (comment) and #195.

thanks for your answer, but it's not work. the image.jpg picture's face is not align , but the same code work in ubuntu C++ env.

C++ code:
cv::Mat alignCrop(const cv::Mat &orig_image, const cv::Mat &face_image)
{
// Align and crop detected face from original image
cv::Mat target_aligned;
_recognizer->alignCrop(orig_image, face_image, target_aligned);
// Extract features from cropped detected face
return target_aligned.clone();
}

my android code is the simple as follow :

        Mat image_align = mBgrScaled.clone();
        Mat mFaces_align = mFaces.clone();
        Imgproc.cvtColor(image_align, image_align, Imgproc.COLOR_BGR2RGBA);
        Imgproc.cvtColor(mFaces_align, mFaces_align, Imgproc.COLOR_BGR2RGBA);
        Mat face_area = new Mat(image_align, rect);

        Mat aligned_face = new Mat();

        faceRecognizerSF.alignCrop(image_align, mFaces.row(max_face_index), aligned_face);
        Mat result_face = aligned_face.clone();

        boolean success = Imgcodecs.imwrite("/storage/emulated/0/Android/data/org.tang.ai.ndkopencv/files/image.jpg", result_face);
        if (success) {
            Log.i(TAG, "image save successfully!");
        }

        Bitmap resultBitmap = Bitmap.createBitmap(result_face.cols(), result_face.rows(), Bitmap.Config.ARGB_8888);
        Utils.matToBitmap(aligned_face.clone(), resultBitmap);
        ImageView imageView = findViewById(R.id.imageView);
        imageView.setImageBitmap(resultBitmap);

        mFaces_align.release();
        face_area.release();
        aligned_face.release();
        image_align.release();
        result_face.release();

and android's result is the same the ndk compile. i compile opencv with cmake in android arm64-v8a mode

the image picture is dealed to 112x112 size , it's meaning the faceRecognizerSF.alignCrop worked, but the face is not align,
so I am feeling very strange 。

[fengyuentau]

Did you try printing facial landmarks on the face? Your provided face image is quite blurry and I guess that facial landmarks may not be accurate enough for alignment.