How to add poisson's noise to predefined binary array (4 x 4 array)

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Ankita Jindal 2021-1-6

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编辑： KALYAN ACHARJYA 2021-1-7

Hello Everyone,

I want to know how to add poisson's noise to predefined binary array.

I have 4 x 4 binary array and I want to add Poisson's noise to it.

---> I already tried poissrnd inbuilt function in matlab but the problem with this function is (this function always generate integer values ranging from 1 to 4 if lambda is 1 or less than 1)

I want to have poisson's noise in the form of floating point numbers between 0 and 1

Please give some suggestions on this.

THank you

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Answer 1

KALYAN ACHARJYA 2021-1-6

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https://ww2.mathworks.cn/matlabcentral/answers/709993-how-to-add-poisson-s-noise-to-predefined-binary-array-4-x-4-array#answer_591973

编辑：KALYAN ACHARJYA 2021-1-6

在 MATLAB Online 中打开

Note: Having 0 and 1 in array data and actually logical data array are two different things.

Please refer the inbuilt function imnoise

https://in.mathworks.com/help/images/ref/imnoise.html#d122e142231

J=imnoise(array_data,'poisson');

Here example

I=randi([0,1],[100,100]); % Any random array data, sizes 100x100
% You may consider any size data
J=imnoise(I,'poisson');
imshow(J);

Note: The array size you mentioned is quite small, so visualization of noise distribution can be difficult in such cases.

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KALYAN ACHARJYA 2021-1-6

编辑：KALYAN ACHARJYA 2021-1-6

在 MATLAB Online 中打开

Note: Having 0 and 1 in array data and actually logical data array are two different things. Hence this function works for uint8, uint16, double, int16, single data type.

Definitely, after adding the noises the pixel value will be change (In 0 & 1 data array, not logical, it may n't be remain "zero or 1"), Here the changes are very less, hence it cant reflects in higher decimanl points.

See

I=randi([0,1],[10,10]);
J=imnoise(I,'poisson');
sub_result=I-J

sub_result =

   1.0e-05 *
    0.2733    0.0133         0         0         0         0    0.0175         0         0    0.1302
         0         0         0    0.0334         0         0    0.0775         0         0    0.0091
    0.1266    0.0583         0    0.0398    0.0347         0         0         0         0         0
         0         0         0    0.0110         0    0.0677         0         0    0.0967         0
         0         0         0         0         0         0         0    0.0048    0.1374    0.0109
    0.0903         0         0         0         0         0    0.0665    0.1197         0    0.0018
         0         0         0         0    0.1723         0    0.0073    0.0092         0         0
         0         0         0         0         0    0.0267         0         0         0         0
         0         0         0         0         0         0    0.0078         0         0         0
         0         0         0         0         0    0.0758         0         0         0    0.1429

Better to see the effects on other array data, and apply the same in your data

PIC source: itl.nist.gov

I=imread('rice.png');
J=imnoise(I,'poisson');
sub_result=I-J
imhist(J);

Ankita Jindal 2021-1-7

Please check the picture for better understanding.

You can see that I need poisson's noise that can be added to the image directly and we have different pixel values on the image.

Thanks

KALYAN ACHARJYA 2021-1-7

编辑：KALYAN ACHARJYA 2021-1-7

If you want to add noise to any data, if there is definitely a change in the values of the data elements, this change follow the PDF map of the applied noise.

Note: The array size you mentioned is quite small, so difference visualization of noise distribution can be difficult in such cases.

Does it make sense to add noise to the image, without changing its pixel values? Hope I understood your question correctly, if not, let me know.

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How to add poisson's noise to predefined binary array (4 x 4 array)

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