Abstract: The invention relates to a method for determining a parameter for fibres, particularly for crimped, irregularly structured fibres, such as textile fibres and tobacco fibres. A given quantity of fibres is separated on a substrate. Two congruent images of the separated fibres is produced with a camera. By means of a grid, the number of grid elements covered by the fibres is determined from the superimposed congruent images. The images are then mutually displaced by one and/or more grid steps (.DELTA.x.sub.o,.DELTA.y.sub.o) in (-x) and (+y) and (x/.+-.y) (diagonally). (For symmetry reasons the (-x) and (-y) displacements give the same results as the (+x), (+y) displacements and the (-x/.+-.y) displacements give the same results as the (+x/.+-.y) displacements. The number of grid elements with fibres of the two images still covering one another following the displacement is determined and added to the number of grid elements with fibres of the non-displaced images.