Förfarande och anordning gällande punsning av sampelkort

摘要

The invention relates to method and apparatus for determining from a sample carrier containing an impregnated biological sample a sample region to be removed. The method comprises optically imaging the sample carrier into a digital matrix form, where the optical brightness of each physical location of the sample is represented by elements of the matrix; determining a first threshold value at least partly on the basis of the elements of the matrix; and calculating coordinates corresponding to the sample region to be removed from the sample carrier, the coordinates being such that the sample region contains only areas of the sample carrier having an optical brightness lower than or equal to said first threshold value. The invention allows for more efficient use of samples in sample cards.