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How to remove Noise using histogram In Matlab

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Stephen john 2022-8-28

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评论： Stephen john 2022-8-29

noisydata.mat

Hello Everyone, i hope you are doing well. I have the following data in which I have some noise. I want to remove the Noise using Histogram or any other Method. I have attached the picture below which is the noise.

How can i do that?

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Abderrahim. B 2022-8-28

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在 MATLAB Online 中打开

Ran in:

noisydata.mat

Hi!

Below is a workflow based on groupcounts function:

clear

load noisydata.mat

figure

subplot(211)

plot(dataset, 'o')

title("noisy data")

% Filtering based groupcounts

[GC, GR] = groupcounts(dataset) ;

denoisedData = dataset(ismember(dataset, GR(GC>10))) ; % group that has count less than 10 will be removed

subplot(212)

plot(denoisedData, 'o')

title("denoised data")

Hope this helps

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Stephen john 2022-8-28

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@Issa Still there is noise as you can see the following Imaage

Abderrahim. B 2022-8-28

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在 MATLAB Online 中打开

Ran in:

noisydata.mat

Hi !

I recommend to use a slider to vary countThresh variable.

clear

load noisydata.mat

figure

subplot(211)

plot(dataset, 'o')

title("noisy data")

% Filtering based groupcounts

[GC, GR] = groupcounts(dataset) ;

countThresh = 20 ; % change this untill you see that the data is fully denoised

denoisedData = dataset(ismember(dataset, GR(GC>countThresh))) ; % group that has count less than 10 will be removed

subplot(212)

plot(denoisedData, 'o')

title("denoised data")

Stephen john 2022-8-29

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在 MATLAB Online 中打开

@Issa Getting the following Error While using this function

Error using cell/ismember (line 34)
Input A of class double and input B of class cell must be cell arrays of character vectors, unless one is a character vector.

Abderrahim. B 2022-8-29

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@Stephen john show your code. For me working just fine.

Stephen john 2022-8-29

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在 MATLAB Online 中打开

dataset.mat

Here is the Dataset and your code it gives error

denoisedData is empty

[GC, GR] = groupcounts(Bindata) ;
countThresh = 30 ; % change this untill you see that the data is fully denoised
denoisedData = Bindata(ismember(Bindata, GR(GC>countThresh))) ; 

Abderrahim. B 2022-8-29

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在 MATLAB Online 中打开

Please show up what print executing the below command:

class Bindata

Stephen john 2022-8-29

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@Issa The Bindata is the array which contain data and class Bindata shows 'char'

Abderrahim. B 2022-8-29

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编辑：Abderrahim. B 2022-8-29

在 MATLAB Online 中打开

Sorry wanted to write

whos Bindata

Maybe you can upload the data from where you got Bindata!

Stephen john 2022-8-29

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dataset.mat

here is the data

Stephen john 2022-8-29

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Name Size Bytes Class Attributes

Bindata 503x1 4024 double

Abderrahim. B 2022-8-29

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在 MATLAB Online 中打开

Ran in:

dataset.mat
filter_by_group.mlx

Check the attached mlx script also.

clear

load dataset.mat

figure

subplot(211)

plot(Bindata, 'o')

title("noisy data")

ylim([20 40])

xlim([0 600])

% Filtering based groupcounts

[GC, GR] = groupcounts(Bindata) ;

countThresh = 11 ; % change this untill you see that the data is fully denoised

denoisedData = Bindata(ismember(Bindata, GR(GC>countThresh))) ; % group that has count less than 10 will be removed

subplot(212)

plot(denoisedData, 'o')

title("denoised data")

ylim([20 40])

xlim([0 600])

Stephen john 2022-8-29

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编辑：Stephen john 2022-8-29

@Issa I need a uniform code which works on all datasets like that , In the above code of your I need to change the countThresh = 11 which is not a good way.

Abderrahim. B 2022-8-29