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Multiple QR code recognition problems


I'm trying to recognize several qr codes on one image, but it doesn't work properly. There are 12 qr codes on my image, but i can find only 4 of them. Zbar finds all of them, but i need to use c# in my project
        BarcodeReader barcodeReader = new BarcodeReader
            AutoRotate = true,
            TryInverted = true,
            Options = new DecodingOptions { TryHarder = true }
        Bitmap image = (Bitmap)Image.FromFile("D:\\TMP\\27.bmp");
        Result[] results = null;
        barcodeReader.Options.PossibleFormats = new List<BarcodeFormat> { BarcodeFormat.QR_CODE };
        results = barcodeReader.DecodeMultiple(image);

        if (results != null)


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