Integration and average of the pixel values for an image.

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.

Answer 1

[DGM]

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

[Joydeb Saha]

Error using sum

Invalid option. Option must be 'double', 'native', 'default', 'omitnan' or 'includenan'.

what should i do then,,

[DGM]

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(:))