Instrumental transcommunication is not limited to sound, there are also numerous ways to communicate with the dead through video devices. One of the methods Newton C. Braga introduced in his book Electronic Projects from the Next Dimension: Paranormal Experiments for Hobbyists, is video inverting.
Basic idea is the same as EVP: you spend excessive time observing, recording and inspecting recorded material, and at some point you will find clear evidence of paranormal things.
Idea of this device is that potential paranormal forms can be seen easier in inverted image.
Images are best seen, if you take photos of the screen, and adjust the contrast to the max.
Even though the idea for this machine is from Braga, this particular schematics are from Gijs Gieskes.