how to calculate number of zeroes in an image array?

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Adnan Saify 2016-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/263254-how-to-calculate-number-of-zeroes-in-an-image-array

评论： Image Analyst 2016-1-10

采纳的回答： Image Analyst

在 MATLAB Online 中打开

suppose i have an image array for example

2 3 1 2 1 1
1 2 5 8 7 9
7 8 9 2 3 0
0 0 1 2 0 0

the above array has 7 zeroes so how to calculate it using a matlab code

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Image Analyst 2016-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/263254-how-to-calculate-number-of-zeroes-in-an-image-array#answer_205665

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Here are two ways:

m=[...
1 2 3 1 2 1 1
0 1 2 5 8 7 9
4 7 8 9 2 3 0
0 0 0 1 2 0 0]
numZeros = numel(m) - nnz(m)
numZeros = sum(sum(m==0))

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Adnan Saify 2016-1-10

i need one more help ,can we determine number of'0' as well as '1' in an array

Image Analyst 2016-1-10

在 MATLAB Online 中打开

I already showed you how to do that - find 0's. For example:

numZeros = sum(sum(m==0))

or in general, to find any integer:

countOfThisNumber = sum(sum(yourArray == yourInteger))

so, to count the 1's, you'd do this:

countOf1s = sum(sum(yourArray == 1))

Of course you can use whatever name for the variables you want. You don't have to use the names I used but I do encourage you to use descriptive names, rather than just single letters, so that your code is maintainable/understandable by others (and you) later, and not just an incomprehensible alphabet soup like we see far too often.

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