Building of a Robust Spline Profile Filter using Labview

[Simone 27]

Hi Thank you to anyone that followed me here from my previous post.

I am looking for some help with the building and implementation of the above mentioned filter. I have the mathematics attached. I will have access to Labviews Digital Filter Toolkit in a couple of days.

The purpose of this filter is to create a mean line through the peaks and vallys of a surface profile. 

[Andy.G]

Hey Simone!

Let me know if you have access to the Digital Filter Toolkit (DFT) and we can work from there, alternatively we can build the filter up from functions within LabVIEW.

[Andy.G]

Hey Simone

Have you managed to get your hangs on the DFT?

[Simone 27]

Hi Andrew,

Really sorry for the late reply, I'm not getting any notifications to my e-mail to say you posted. Just said i'd check today incase 🙂

I'm in all day on Monday in my project room. Ray is installing Labview 2010 (had 8.5) for me now on my station and is adding the DFT so i'll have access on Monday to it.

How does the maths look to you, should it be reasonable enough to implement. Also do I have everything I'll need (maths wise)

Thank you for your continued help, sorry again for the late reply.

Le meas

[Andy.G]

Hey Simone,

Yes you should have everything you need, the matrices should be easy enough to deal with as LabVIEW’s matrix functions a straight forward to use, as for the math its best to just try some known constant values to use with the Spline filter to see if it achieves the expected results. Once you can confirm you are getting the expected behaviour out of the filter, you can look into implementing the rest of the mathematics. For projects like this it’s always best to break it down into small "bite size" chunks and test those individually before putting it all together.

[Simone 27]

Hi,

I'm up and running 🙂 (As in I now have Labview 2010&DFD)

Just going to have a look through some examples and read some help..

Le meas

[Andy.G]

Hey,

Ok sweet, let me know if you run into any difficulties, I’m just going to knock up some examples for you using the matrix functions so you can begin to test the filter ASAP and see if it meets the requirements.

[Simone 27]

Hi,

That's great , Thanx

Le meas

[Simone 27]

Hi,

Mmmmm, ok so the signal and the maths equations will be he inputs to the filter....?? Am I building a filter from sctatch or is there one that can be altered?

Le meas

[Andy.G]

Hey Simone,

I have used some basic labview code to generate a couple of matrices and I've done some basic calculations, I was hoping to show you how to implement them. As for the spline filter there is on in the DFT, if you press CTRL+Space bar it will bring up LabVIEW search (this takes some time to load) the type spline and you should find it.