Uploaded May 2021 | Updated September 2026, 1 hour ago
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.
Mayer, Sven; Xu, Xiangyu; Harrison, Chris 2021. Super-Resolution Capacitive Touchscreens. Proceedings of the 2021 CHI Conference on Human Factors in Computing Systems. CHI '21. Association for Computing Machinery, New York, New York, USA
DOI: doi.org/10.1145/3411764.3445704
Authors:
Sven Mayer (CMU)
Xiangyu Xu (CMU)
Chris Harrison (CMU)
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.
Mayer, Sven; Xu, Xiangyu; Harrison, Chris 2021. Super-Resolution Capacitive Touchscreens. Proceedings of the 2021 CHI Conference on Human Factors in Computing Systems. CHI '21. Association for Computing Machinery, New York, New York, USA
DOI: doi.org/10.1145/3411764.3445704
Authors:
Sven Mayer (CMU)
Xiangyu Xu (CMU)
Chris Harrison (CMU)
