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Integration and average of the pixel values for an image.

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Joydeb Saha
Joydeb Saha 2021-9-30
评论： DGM 2021-9-30
If I have a spatial map, how can I calculate the integration and average of the pixel values for the map? say my file nname is 'spatial.png' . I should get two numbers.

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DGM
DGM 2021-9-30
Ran in:
You just mean the global sum and mean? Should the image be normalized? Assuming not:
A = imread('cameraman.tif'); % this is uint8 (0-255)
sumA = sum(A,'all')
sumA = 7780728
meanA = mean(A,'all')
meanA = 118.7245
Just to demonstrate that it makes sense:
sumA/numel(A) % same as the mean
ans = 118.7245
  2 个评论
Joydeb Saha
Joydeb Saha 2021-9-30
Error using sum
Invalid option. Option must be 'double', 'native', 'default', 'omitnan' or 'includenan'.
what should i do then,,
DGM
DGM 2021-9-30
You must be using an older version. I don't remember when the options changed, but this should do the same:
sumA = sum(A(:))
meanA = mean(A(:))

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