Reduce tracking window using google mlkit vision samples

I would like to reduce the reduce bar code tracking window when using the google vision api. There are some answers here but they feel a bit outdated.

I'm using google's sample: https://github.com/googlesamples/mlkit/tree/master/android/vision-quickstart

Currently, I try to figure out if a barcode is inside my overlay box inside BarcodeScannerProcessor onSuccess callback:

override fun onSuccess(barcodes: List<Barcode>, graphicOverlay: GraphicOverlay) {
    if(barcodes.isEmpty())
      return;

    for(barcode in barcodes) {
      val center = Point(graphicOverlay.imageWidth / 2, graphicOverlay.imageHeight / 2)
      val rectWidth = graphicOverlay.imageWidth * Settings.OverlayWidthFactor
      val rectHeight = graphicOverlay.imageHeight * Settings.OverlayHeightFactor

      val left = center.x - rectWidth / 2
      val top = center.y - rectHeight / 2
      val right = center.x + rectWidth / 2
      val bottom = center.y + rectHeight / 2

      val rect = Rect(left.toInt(), top.toInt(), right.toInt(), bottom.toInt())

      val contains = rect.contains(barcode.boundingBox!!)
      val color = if(contains) Color.GREEN else Color.RED

      graphicOverlay.add(BarcodeGraphic(graphicOverlay, barcode, "left: ${barcode.boundingBox!!.left}", color))
    }
}

Y-wise it works perfectly, but the X values from barcode.boundingBox e.g. barcode.boundingBox.left seems to have an offset. Is it based on what's being calculated in GraphicOverlay?

I'm expecting the value below to be close to 0, but the offset is about 90 here:

Or perhaps it's more efficient to crop the image according to the box?

from Reduce tracking window using google mlkit vision samples