2.11.2.8 wtdenoise(Pro)
Menu Information
Analysis: Signal Processing: Wavelet: Denoise
Brief Information
Remove noise using wavelet transform
Additional Information
This feature is for OriginPro only.
Command Line Usage
1. wtdenoise iy:=col(2);
2. wtdenoise iy:=col(2) type:=db2;
3. wtdenoise iy:=col(2) thrt:=sqtwolog level:=7;
4. wtdenoise iy:=col(2) thrt:=custom thrd:=30;
X-Function Execution Options
Please refer to the page for additional option switches when accessing the x-function from script
Variables
Display
Name
|
Variable
Name
|
I/O
and
Type
|
Default
Value
|
Description
|
| Input
|
iy
|
Input
XYRange
|
<active>
|
Specify the input signal
|
| Wavelet Type
|
type
|
Input
int
|
haar
|
Specify the wavelet type
Option list
- haar:Haar
- Haar wavelet
- db 2:DB2
- Daubechies wavelet (N=4
- db 3:DB3
- Daubechies wavelet (N=6)
- db 4:DB4
- Daubechies wavelet (N=8)
- db 5:DB5
- Daubechies wavelet (N=10)
- db 6:DB6
- Daubechies wavelet (N=12)
- db 7:DB7
- Daubechies wavelet (N=14)
- db 8:DB8
- Daubechies wavelet (N=16)
- db 9:DB9
- Daubechies wavelet (N=18)
- db 10:DB10
- Daubechies wavelet (N=20)
- b11:Bior1.1
- Biorthogonal (Nr=1, Nd=1)
- b13:Bior1.3
- Biorthogonal (Nr=1, Nd=3)
- b15:Bior1.5
- Biorthogonal (Nr=1, Nd=5)
- b22:Bior2.2
- Biorthogonal (Nr=2, Nd=2)
- b24:Bior2.4
- Biorthogonal (Nr=2, Nd=4)
- b26:Bior2.6
- Biorthogonal (Nr=2, Nd=6)
- b28:Bior2.8
- Biorthogonal (Nr=2, Nd=8)
- b31:Bior3.1
- Biorthogonal (Nr=3, Nd=1)
- b33:Bior3.3
- Biorthogonal (Nr=3 Nd=3)
- b35:Bior3.5
- Biorthogonal (Nr=3, Nd=5)
- b37:Bior3.7
- Biorthogonal (Nr=3, Nd=7)
|
| Extension Mode
|
ext
|
Input
int
|
periodic
|
Specify the end extension mode used in wavelet transform
Option list
- periodic:Periodic
- The input signal will be viewed as periodic.
- pad0:Zero -padded
- The data points outside the input range will be viewed as zeroes.
|
| Output
|
oy
|
Output
XYRange
|
<new>
|
Specify the output range
See the syntax here.
|
| Threshold Type
|
thrt
|
Input
int
|
custom
|
Specify how to decide the threshold for truncating the detail coefficients of each level.
Option list
- custom:custom
- The threshold is set using the variable thrd
- sqtwolog:sqtwolog
- The threshold is computed from the length of detail coefficients
|
| Thresholding Level
|
level
|
Input
int
|
1
|
Specify the number of levels for which detail coefficients are to be thresholded. A large level will cause more noise to be removed; but unfortunately the probability that the useful signal is distorted will be larger, compared with a small level.
|
| Threshold of every Level (%)
|
thrd
|
Input
double
|
50.
|
Only available when threshold type is Custom. It specifies a threshold value, which will be used for discarding the detail coefficients for all levels.
|
Examples
1. To perform wavelet denoising using sqtwolog to determine the threshold, to XY data in columns 1, 2 of the active worksheet, use the script command:
wtdenoise (1,2) thrt:=1
2. To perform default wavelet denoising to active data plot in graph, activate the plot then use the script command:
wtdenoise
3. To perform wavelet denoising using a pre-saved theme file called Mytheme, type in the Command Window:
wtdenoise -t mytheme
More Information
For more information, please refer to our User Guide.
Related X-Functions
dwt, idwt, wtsmooth
Keywords:smoothing
|