Slow and not detect the chess board

[frigiddragon]

I took 1 hours to configure the project to work with new Android Studio.
However, after install I found the application performance is bad, and it cannot calibrate.

[goldbattle]

Application performance is bad, as in it is unable to detect the target? or something else?
I know the framerate of the camera was always bad, and I never figured out how to increase it.
Have you taken a look at this pr: #6

We don't actively use this project, so I am not sure if it even works any more.
An alternative is to export the image to file and then process it on a PC.