Unterschiede

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--- lehre:ws18:fsm_18ws:group_e [17.01.2019 07:27] – Quelle hinzugefügt wip05257
+++ lehre:ws18:fsm_18ws:group_e [22.03.2019 22:42] (aktuell) – Updated short description ost03246
@@ Zeile 5: / Zeile 5: @@
 members_            : Paul Winderl, Johannes Dengler, Thomas Oswald
 keywords_           : WIP, measuring, user study, input device, latency
-shortdescription    : This research project examines a way of non-invasive measurement of input device latency. To achieve this, we try to measure the pressure point of a input button and repeat a clicking mechanism to get latency data. After collecting those, we compare the result with an invasive approach that was used in a previous study.
+shortdescription    : Research in latency measurement is conducted since decades, but has ongoing relevance to users of input devices. Therefore we investigate a new approach to this topic. Bockes, Schmid and Wimmer [1] describe an invasive way to measure input latency for different types of devices. We pick up their idea and conduct experiments with the same devices but using a non-invasive approach. This means, that we focus on pressing a button of an input-device that is connected to a Raspberry Pi 2 via USB to trigger an input-event and measure the time it takes to arrive at the system. The button-press is achieved by a robot that physically triggers said button through the movement of a measuring head.
+To obtain the exact moment of the click-event, we capture the timestamp immediately after the stepper motor moved down a definite distance, which is calibrated beforehand. A second timestamp is saved when the USB-event arrives. Subtracting the first timestamp from the latter returns our calculated input latency.
+This approach will be helpful in research and industrial areas to assess the latency of input devices. We implemented a reliable process to measure latency for a selection of devices and got close to the findings of the invasive approach. However, with our current method, we can't robustly assess all device types. Further, studies will need to use other means, such as an algorithm using differential geometry for the pressure curve, to reach that goal.
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 A non-invasive approach for measuring input device latency: Method for input device latency measurement without irreversibly damaging the device.
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+This research project examines a way of non-invasive measurement of input device latency. To achieve this, we try to measure the pressure point of a input button and repeat a clicking mechanism to get latency data. After collecting those, we compare the result with an invasive approach that was used in a previous study.
 {{ :lehre:ws18:fsm_18ws:project_image_group_e.jpg?nolink&300 |Experimental Design }}