public void ExplicitlyDetectMulti()
        {
            using var obj = new QRCodeDetector();

            using var withQr    = Image("qr_multi.png");
            using var pointsMat = new Mat();
            ShowImagesWhenDebugMode(withQr);

            bool detected = obj.DetectMulti(withQr, out var points);

            Assert.True(detected);
            Assert.Equal(8, points.Length);

            var expectedPoints = new[]
            {
                new Point2f(39, 39),
                new Point2f(260, 39),
                new Point2f(260, 260),
                new Point2f(39, 260),

                new Point2f(334, 334),
                new Point2f(565, 334),
                new Point2f(565, 565),
                new Point2f(334, 565),
            };

            AreEquivalent(expectedPoints, points);
        }
        public void EmptyDetectMulti()
        {
            var lenna = Image("lenna.png");

            using var obj = new QRCodeDetector();

            bool detected = obj.DetectMulti(lenna, out var points);

            Assert.False(detected);
            Assert.Empty(points);
        }
        public void ExplicitlyDecodeMulti()
        {
            var expectedDecodedStrings = new[]
            {
                "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!\"#$%&'()*+,-./:;<=>?@[]^_`{|}",
                "Helloこんにちは你好안녕하세요"
            };

            using var obj = new QRCodeDetector();

            using var withQr    = Image("qr_multi.png");
            using var pointsMat = new Mat();
            ShowImagesWhenDebugMode(withQr);

            bool detected = obj.DetectMulti(withQr, out var points);

            Assert.True(detected);
            Assert.Equal(8, points.Length);

            bool decoded = obj.DecodeMulti(withQr, points, out var decodedStrings, out var straightQrCode);

            Assert.True(decoded);
            Assert.Equal(2, decodedStrings.Length);
            AreEquivalent(expectedDecodedStrings, decodedStrings);

            foreach (var mat in straightQrCode)
            {
                ShowImagesWhenDebugMode(mat);
            }

            bool decodedWithoutStraightQrCode = obj.DecodeMulti(withQr, points, out decodedStrings);

            Assert.True(decodedWithoutStraightQrCode);
            Assert.Equal(2, decodedStrings.Length);
            AreEquivalent(expectedDecodedStrings, decodedStrings);
        }