\input zb-basic \input zb-ioport \iteman{io-port 05988933} \itemau{Nekouzadeh, Ali; Genin, Guy M.} \itemti{Quantification of fibre polymerization through Fourier space image analysis.} \itemso{Proc. R. Soc. Lond., Ser. A, Math. Phys. Eng. Sci. 467, No. 2132, 2310-2329 (2011).} \itemab Summary: Quantification of changes in the total length of randomly oriented and possibly curved lines appearing in an image is a necessity in a wide variety of biological applications. Here, we present an automated approach based upon Fourier space analysis. Scaled, band-pass filtered power spectral densities of greyscale images are integrated to provide a quantitative measurement of the total length of lines of a particular range of thicknesses appearing in an image. A procedure is presented to correct for changes in image intensity. The method is most accurate for two-dimensional processes with fibres that do not occlude one another. \itemrv{~} \itemcc{} \itemut{fibre length measurement; cellular mechanics; automated image processing} \itemli{doi:10.1098/rspa.2010.0623} \end