Fig. 4: Bi-channel signals of the 12 samples.
From: Deep learning-assisted object recognition with hybrid triboelectric-capacitive tactile sensor
a a PTFE ball, a billiard ball, a hollow rubber ball, and a solid rubber ball, b a normal tennis ball and a broken tennis ball, c a normal PE ball and a broken PE ball, d a normal mango and an overripe mango, e a normal kiwi and an overripe kiwi
