Using ZXing in Unity to locate QRcode's Position Pattern

Question

As the title, i want to use locate three Position Pattern.

Example

I want to know how to get the x y position of those pattern when I got a new QR code from a webcamtexture.
How should I implement this is Unity(C#)?

Answer 1

Use the following code for decoding ZXing dll.

private WebCamTexture camTexture;
private Rect screenRect;
void Start()
{
    screenRect = new Rect(0, 0, Screen.width, Screen.height);
    camTexture = new WebCamTexture();
    camTexture.requestedHeight = Screen.height;
    camTexture.requestedWidth = Screen.width;
    if (camTexture != null)
    {
        camTexture.Play();
    }
}

void OnGUI()
{
    // drawing the camera on screen
    GUI.DrawTexture(screenRect, camTexture, ScaleMode.ScaleToFit);
    // do the reading — you might want to attempt to read less often than you draw on the screen for performance sake
    try
    {
        IBarcodeReader barcodeReader = new BarcodeReader();
        // decode the current frame
        var result = barcodeReader.Decode(camTexture.GetPixels32(), camTexture.width, camTexture.height);
        if (result != null)
        {
            Debug.Log("DECODED TEXT FROM QR: " +result.Text);
        }
        ResultPoint[] point = result.ResultPoints;
        Debug.Log("X: " + point[0].X + " Y: " + point[1].Y);
    }
    catch (Exception ex) { Debug.LogWarning(ex.Message); }
}

I had taken reference from ZXing dll link. It also has qr code generator in readme. Go through readme. Its almost same just ResultPoint[] point = result.ResultPoints; has been added to it. This gives the position of the 3 corners of image. Obviously you will need to add the ZXing.dll in plugins folder in the Assets. Hope this helps to get the result.