Automated keystone correction

Quite impressed about the re-done keystone correction:

Let's see what the auto-correction in C1 does:

There has been a serious improvement in the inacceptable keystone tool it was before, but it looks like there is waaaay to go before this function justifies the Rolls-Royce price tag of the program. If you ask for 160€ update price a year, deliver proper work!

I'm aware it's a tricky picture but major contrast lines are pretty obvious (and not even the diaoganals get interpreted in the right way - see left side) - and of course I can do a manual correction.

Cheers, Timo