I am connecting my Nexus 4 to a projector - but the resulting image is trapezoidal due to keystone. I want to be able to control this using software such that the image that goes out of the android is already corrected for this problem (In such a case, the projection will get smaller for the wider edge of the trapezoid and will be equal to the narrow edge; the remaining area can be black pixels.) There are two things to do here - one is the actual algorithm for keystone correction, which I think I have found here - Algorithm for software keystone correction. Any other efficient algos? And the second is how to modify the displayed screen in android to the one I want to send (if I were somehow able to change the android screen resolution to a trapezoidal value!). I don't mind distorting the phone display as long as the projected display is good. Also, would prefer this for any running app, not necessarily my app. Thanks a ton!
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