1. A fingerprint scanning and image reconstruction system comprising: a fingerprint scanner providing a first scan line and a second scan line separated by a line separation distance in a scanning direction; and an image reconstruction module in communication with the fingerprint scanner, the image reconstruction module receiving scan lines including at least the first scan line and the second scan line, the image reconstruction module accumulating scan lines over a time period t; the image reconstruction module determining a value for decimation (t) necessary to produce a selected y axis resolution in the scanning direction based at least in part on (line count(t) divided by line separation distance) times the selected y resolution, where line count(t) is the number of lines accumulated as a function of the time period t, and decimation(t) is a ratio indicative of whether the line count(t) is greater than or less than the number of lines accumulated as a function of the time period t that will result in the selected reconstructed image y resolution in the scanning direction.