The document discusses a method to predict impulsive gamepad inputs using a force-sensitive resistor to detect early pressure changes on button surfaces. It outlines an experimental approach with an accuracy of 87.88% in predicting button presses and releases, demonstrating an average advance time of about 30ms. Future work aims to adapt the method for diverse controllers and individual user pressing styles.

1. Prediction of Impulsive Input on
Gamepad Using Force-Sensitive
Resistor
Atsuya Munakata
Keio University
Yuta Sugiura
Keio University
01 STORY
02 THEORY
Predicting Input from Changes in Pressure
on Button Surface
- Just before the button state change, there is a steep pressure change on
a button.
- Put a force-sensitive resistor (FSR) on a tactile switch.
- Apply edge extraction to time series data of pressure change.
- Regard extracted edges as the signs of future button input.
Cloud gaming suffers from latency
in terms of game response in
communicating with remote servers.
Background
It is difficult to predict impulsive input,
e.g. firing gun, by the probability
model that learns user inputs.
Problem
We install a force-sensitive resistor on
a button to detect the initial movement
of a finger pressing the button.
Approach
03 PREDICTING ON EVENT
- Adopt gradient filter in
which The original data is
processed by erosion and
then subtracted from the
original data.
- Set appropriate threshold
to detect the edge.
04 PREDICTING OFF EVENT
- Regard the pressure
change around button OFF
event as cosine wave and
convert it to sin wave in
phase.
- The same edge extraction
process can be applied.
05 EVALUATION
- Experiment on eight people.
- ON: 30.82ms in advance on
average
- OFF: 29.30ms in advance on
average
- Accuracy: 87.88% on harmonic
average
06 FUTURE WORK
- Confirm that our method can be applied to the
controllers on the market.
- Cancel differences between the individual way in
pressing button by ingenuity of mechanism.
- Implement dynamic setting of parameters that suit
each user.
Contact: info-lcl-group@keio.jp
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Predictiontime[ms]
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FSR Button
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