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tdebnath
Singapore
8 Posts |
 Posted - 07/03/2017 : 05:42:53 AM
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Hi everybody,
It is easy to perform smoothing for 1D data (e.g. Absorbance vs Wavelength in only one particular time) in Analysis ->Signal processing -> Smooth or FFT Filter. How can I perform the same for 2D dataset (e.g. Absorbance vs Wavelength in thousands of time)? I found somewhere they told to use 2D FFT Filter (in Signal processing section) to smooth the dataset, however I didn't find that particular one under Signal processing section (I am using Origin 8.5).
Note: My data is not evenly spaced, so I interpolate the 1D data to smooth.
Thanks
Tushar |
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Shirley_GZ
China
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Posted - 07/04/2017 : 02:31:35 AM
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Hi Tushar,
The 2D Smoothing and 2D FFT Filter menu item under Signal Processing section are only available when a Matrix window is activated.
So, you need convert your data to matrix firstly if you are have them in XYZ format.
http://www.originlab.com/doc/Origin-Help/XYZGridding-Dialog
Then, you can perform 2D smoothing or 2D FFT Filter on your data.
Thanks,
Shirley
OriginLab
Originlab Technical Service Team |
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tdebnath
Singapore
8 Posts |
Posted - 07/07/2017 : 02:59:38 AM
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Hi Shirley,
Thanks a lot for your suggestion. However while performing 2D smoothing, as you suggested, I found only default setting for 2D smoothing (i.e. I can not customise 2D smoothing while for 1D smoothing one can do customisation e.g. 5 point, 10 point smoothing etc.). Is there any customisation option?
The major problem I faced while converting my original data to matrix (i.e. before perform 2D smoothing), I found the programme changes my X- and Y- axis values to some arbitary values. For example, my original data have X- values form 335 to 465 unit and Y- values from -500 to 3500 unit, however after converting to matrix, it reads X- values from 0 to 1000 unit and Y-values from 0 to 800 unit. Please suggest how to get rid of this serious problem.
Thanks,
Tushar |
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Shirley_GZ
China
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Posted - 07/07/2017 : 06:40:44 AM
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Hi Tushar,
Yes, there isn't any option to customize the 2D Smoothing. You can read this page to learn the default settings of this dialog, http://www.originlab.com/doc/Origin-Help/MSmooth-Algorithm
If you are converting XYZ data to matrix, I don't think the XY values will be changed. Actually, by default, matrix sheet won't show the actual XY values(but the index numbers), you need select View: Show X/Y menu to show them.
If still problem, please send us the OPJ file via tech@originlab.com
Thanks,
Shirley
Originlab Technical Service Team |
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tdebnath
Singapore
8 Posts |
Posted - 07/07/2017 : 11:42:01 AM
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Hi Shirley,
Thanks for your reply. Yes, I found the matrix sheet shows the index number (pixel) of XY, however on selecting View: Show X/Y on the matrix sheet does not still convert them to original XY values.
I am sorry, at the moment, I can not share my data to you (confidential data). I am not sure without the OPJ file you can help me or not.
Thanks,
Tushar |
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Smoothing of 2D dataset