7 March 2014 Electronic trigger for capacitive touchscreen and extension of ISO 15781 standard time lag measurements to smartphones
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Abstract
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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François-Xavier Bucher, François-Xavier Bucher, Frédéric Cao, Frédéric Cao, Clément Viard, Clément Viard, Frédéric Guichard, Frédéric Guichard, "Electronic trigger for capacitive touchscreen and extension of ISO 15781 standard time lag measurements to smartphones", Proc. SPIE 9023, Digital Photography X, 90230D (7 March 2014); doi: 10.1117/12.2042162; https://doi.org/10.1117/12.2042162
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