Dear Lena, the module was written by a student in order to comply the ISO standard, so I am not very sure about all the implementation details. But as far as I remember, the only frequency is used to separate the waviness and roughness, assuming that the range of spatial frequencies that SPM can cover anyway cancels the low and high frequency components (i.e. acting as two more filters).
If necessary, also Gwyddion 1D or 2D FFT filtering modules could be use to create a subset of spatial frequencies before analysis. Best regards, Petr On 06/18/2012 03:53 PM, Mandl, Magdalena wrote: > Hi, > > i´m calculating the roughness and waviness in Gwyddion with the ISO button. > I guess as low-pass filter an Gaussian filter is used, is this right? What > kind of filter is used for the high-pass filter? > > Furthermore, i´m wondering that I just chose one cut-off frequency "fc", > which cuts the roughness off from the waviness and the other way round for > the roughness. In ISO 4287 they talk about three cutoff frequencies (see > picture). > What about the Cut-off frequency "fs" in gwyddion, which cuts off the noise > and makes the primary profile? > Also what about the Cut-off frequency "ff" in gwyddion, which cuts off the > coarse shape and makes together with the cut off fc the waviness Profile. > > Would be great if someone could help me. > > Best regards Lena > > > > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > > > _______________________________________________ > Gwyddion-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/gwyddion-users > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Gwyddion-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gwyddion-users
