Electronic trigger for capacitive touchscreen and extension of ISO 15781 standard time lag measurements to smartphones
2014
We present in this paper a novel capacitive device that stimulates the touchscreen interface of a smartphone (or of any
imaging device equipped with a capacitive touchscreen) and synchronizes triggering with the DxO LED Universal Timer
to measure shooting time lag and shutter lag according to ISO 15781:2013. The device and protocol extend the time lag
measurement beyond the standard by including negative shutter lag, a phenomenon that is more and more commonly found
in smartphones.
The device is computer-controlled, and this feature, combined with measurement algorithms, makes it possible to
automatize a large series of captures so as to provide more refined statistical analyses when, for example, the shutter lag
of “zero shutter lag” devices is limited by the frame time as our measurements confirm.
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