This paper illustrates a method for phones to know what a touched objects is - bare hands, cotton, and leather carrying case.
- J. Mantyjarvi, et al., "Touch detection system for mobile terminals," Lecture Notes in Computer Science, Vol. 3160, pp. 331-336, 2004.
See also Apple patent US20080158147 that uses object identification to reduce unintended operations of capacitive touch screens.
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