Replace values to create an image with binary values (0,1)

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Amjad Iqbal 2022-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/1655040-replace-values-to-create-an-image-with-binary-values-0-1

评论： Amjad Iqbal 2022-2-21

采纳的回答： Image Analyst

Dear Researchers,

I have a matrix (2D image) which I need to replace values in such a way to obtain binary image.

I used Max function which replace values for one condition. However, In this case, I need to replace values greater and less than zero with zero (0) and replace all values = zero with 1.

I have uploaded image, vaues are ranging from (-3.8 to 3.8), can you please guide me on how to obtain binary image.

Many thanks in advance.

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Image Analyst 2022-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/1655040-replace-values-to-create-an-image-with-binary-values-0-1#answer_901250

在 MATLAB Online 中打开

Image.mat

OK, now that you've added the .mat file, there are no values that are exactly 0. You need to define a range.

s = load('image.mat')
V = s.V;
subplot(2, 2, 1);
imshow(V, []);
colorbar
subplot(2, 2, 3:4);
histogram(V, 256);
grid on;
title('Histogram of V')
xlabel('Value')
ylabel('Count')
% There are no values that are exactly zero so let's pick a tolerance
tolerance = 0.1;
binaryImage = abs(V) < tolerance;
subplot(2, 2, 2);
imshow(binaryImage, []);

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Amjad Iqbal 2022-2-21

Perfect, It works, with what i required, now it's all about siffting and get more accurate results.

Many thanks dear @Image Analys

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Cris LaPierre 2022-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/1655040-replace-values-to-create-an-image-with-binary-values-0-1#answer_901175

在 MATLAB Online 中打开

Sounds like a logical result would work.

a = [-3.8 -1 0 1 3.8];
c = a~=1
c = 1×5 logical array
   1   1   1   0   1

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Amjad Iqbal 2022-2-21

Image.mat

Dear @Cris LaPierre I have attached data file, since size is larger, I clipped small size.

Cris LaPierre 2022-2-21

The challenge I see is that none of your data values exactly equal 1. You'll need to look at your data and decide what range of values you want to consider to represent land.

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