Latency

Latency is a measurement of the added time the projector needs to display an image. This is measured from when the first pixel (not v-sync) of an image arrives at the projector until the first light of the same image is being displayed by the projector. This time is measured in milliseconds. The latency is also referred to as transport delay.

Different projector settings affect latency. For example, the amount of warp applied to the image might affect latency since the projector has to wait longer for the required pixels to arrive at the input. As will be shown later, warping can in certain special settings reduce latency compared to a non-warped image.

In a multi projector setup, different projectors most often have different warp settings and thereby different latencies. To keep a full system at the same latency and in sync, each projector has the possibility to add to the latency (transport delay). In a multi-projector setup, all projectors should be set to the same latency as the projector with the highest transport delay.