Experimental Results
Surface with a Valley
In this experiment, a fingertip is moving from left to right over a valley located approximately in the region bordered by green dotted lines in Figure 1(b). Figures 2 and 3 show a clear pattern of stretch on the left of the bump and compression on the right of the bump.
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(a) Illustration (not to scale).
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(b) Fingerprint with approximate position of bump.
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Figure 1. Finger sliding over surface with a valley. |
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(a) Interval of 1 frame.
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(b) Interval of 11 frames.
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Figure 2. Measurements obtained from the relative
variations in edge length. |
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(a) Interval of 1 frame.
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(b) Interval of 11 frames.
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Figure 3. Measurements obtained from the relative
variations in area. |