Apply transformations to PreviewView frames with opencv

[Rodolfo Ruffer]

Guys, I'm developing a document scanner. and I wanted to display a rectangle identifying the object in the camera view with the opencv. Something like that:

https://github.com/rruffer/LiveEdgeDetection

I currently do this in ImageAnalysis.Analyzer and feed an imageView. But I was wondering if there is any way to do it directly in PreviewView. With some callback that changes the frame before it is displayed.

[Yossi Elkrief]

You will need to use your own PreviewView and not use the PreviewView as it gets that frames from the camera directly and currently there is no api to inject frames to it.