liveness method

Future<bool> liveness(CameraController controller)

Implementation

Future<bool> liveness(CameraController controller) async
{
    try
    {
        final List<XFile> frames = [];
        for (int i = 0; i < 3; i++)
        {
            frames.add(await controller.takePicture());
            if (i < 2) await Future.delayed(Duration(milliseconds: 500));
        }
        double totalDiff = 0;
        for (int i = 0; i < frames.length - 1; i++)
        {
            final bytes1 = await frames[i].readAsBytes();
            final bytes2 = await frames[i + 1].readAsBytes();
            final img1 = img.decodeImage(bytes1);
            final img2 = img.decodeImage(bytes2);
            if (img1 == null || img2 == null) return false;
            final small1 = img.copyResize(img1, width: 64, height: 64);
            final small2 = img.copyResize(img2, width: 64, height: 64);
            int pixelDiff = 0;
            for (int y = 0; y < 64; y++)
            {
                for (int x = 0; x < 64; x++)
                {
                    final p1 = small1.getPixel(x, y);
                    final p2 = small2.getPixel(x, y);
                    pixelDiff += ((p1.r - p2.r).abs() + (p1.g - p2.g).abs() + (p1.b - p2.b).abs()).toInt();
                }
            }
            totalDiff += pixelDiff / (64 * 64 * 3);
        }
        final avgDiff = totalDiff / 2;
        return avgDiff > livenessMin! && avgDiff < livenessMax!;
    }
    catch (e, s)
    {
        print("Liveness error: $e\n$s");
        return false;
    }
}