Optical mixing of PAL and VGA images using iGlasses AR helmet

Introduction In my previous report I discussed the realtime behaviour of electronic mixers capable of mixing a PAL with a VGA image, downconverting the mixed images to PAL format. We concluded that the behaviour, especially in the temporal domain, is suboptimal. If possible, we would like get better real-time behaviour. One possibility is to mix these images optically. This report discusses how this can be done using the VGA LCD display in our AR helmet. First, the setup is described. In the second section the mixing results are discussed. The third section discusses the latency as estimated from measurements. Results show that this is a feasible solution, but that the brightness of the mixed output is very low.