@inproceedings{mayer2021super,
	title = {Super-Resolution Capacitive Touchscreens},
	author = {Sven Mayer and Xiangyu Xu and Chris Harrison},
	year = {2021},
	booktitle = {Proceedings of the 2021 CHI Conference on Human Factors in Computing Systems},
	publisher = {Association for Computing Machinery},
	address = {New York, New York, USA},
	series = {CHI '21},
	doi = {10.1145/3411764.3445703},
	url = {https://sven-mayer.com/wp-content/uploads/2021/01/mayer2021super.pdf},
	date = {2021-05-08},
	abstract = {Capacitive touchscreens are near-ubiquitous in today’s touch-driven devices, such as smartphones and tablets. By using rows and columns of electrodes, specialized touch controllers are able to capture a 2D image of capacitance at the surface of a screen. For over a decade, capacitive "pixels" have been around 4 millimeters in size - a surprisingly low resolution that precludes a wide range of interesting applications. In this paper, we show how super-resolution techniques, long used in fields such as biology and astronomy, can be applied to capacitive touchscreen data. By integrating data from many frames, our software-only process is able to resolve geometric details finer than the original sensor resolution. This opens the door to passive tangibles with higher-density fiducials and also recognition of every-day metal objects, such as keys and coins. We built several applications to illustrate the potential of our approach and report the findings of a multipart evaluation.},
	keywords = {capacitive sensing, mobile device, super resolution}
}