private fun processImageDetection(bitmap: Bitmap) {
        val visionImg = FirebaseVisionImage.fromBitmap(bitmap)
        var objectDetector = FirebaseVision.getInstance().getOnDeviceObjectDetector().processImage(visionImg)
            .addOnSuccessListener { visionObjects ->
            textView.text = visionObjects.size.toString()
            for (visionObject in visionObjects) {
                var canvas = Canvas(bitmap)
                canvas.drawRect(visionObject.boundingBox, paint)
            }
        }
    }