4 ms·
Well... yeah, but there is quite a lot of smearing. Will the quality of the finger print you can extract that way using whatever means you have be of high enou
by joakleaf 13y ago
Well... yeah, but there is quite a lot of smearing.
Will the quality of the finger print you can extract that way using whatever means you have be of high enough quality?
It is not obvious to me that you'll be able to get something that is 2400 DPI quality.
- contingencies 13y agoLook at your finger. Actual ridges are not that dense. A sampling frequency of 20 points per mm is high enough to visualise a fingerprint in sufficient detail for identification purposes https://en.wikipedia.org/wiki/Fingerprint#Research https://en.wikipedia.org/wiki/Fingerprint#Research Random #s: 20dpmm = 5,080dpi? Sounds like 2400dpi sensing is certainly insufficient for research-grade identification... and therefore maybe easy to fool? :)
- brianpgordon 13y agoDPI refers to the number of samples in a straight line one inch long, not to the number of samples in a 1 inch square.
- contingencies 13y agoAha! Thanks, that makes more sense. So 1 inch = 25.4mm. 20 dots per mm is sufficient. So 20x25.4 = 508dpi. That's more believable as a rough minimum.