How to calculate the mean from different images at once? TBV1 and RVI1 cover each other and have the same size. in the following code I calculated thea mean of all the pixels of Tb where the condition applies.I have 3 more set of Tbv and RVI .

I need to calculate mean of all pixel of TBs where condition (RVI>=0 and RVI<=0.2)applies.my images are Tbv2,Tbv3,Tbv4 and RVI2,RVI3,RVI4.Please note that I dont want to calculate mean of each image seperately.the mean should be calculated at once for all images.

Tbv1 = imread('tb.tif');

RVI1 =imread('rvi.tif')

ME = mean(Tbv1( RVI1>=0 & RVI1 <=0.2));

Answer 1

[Guillaume]

Concatenate your images in cell arrays, and use cellfun to calculate the mean in one go:

Tbv = {Tbv1, Tbv2, Tbv3, Tbv4};
Rvi = {Rvi1, Rvi2, Rvi3, Rvi4};
me = cellfun(@(tbv, rvi) mean(tbv(rvi>=0 & rvi<=0.2)), Tbv, Rvi);

[Hana]

Thanks Guillaume for your answer...Is it necessary that Tb41,Tb42,Tb43,Tbv4 have the same size? my files do not have the same size.

[Guillaume]

Unlike matrices, elements of a cell array don't have to be the same size (or the same type), so no Tbv1, Tbv2, etc. don't have to be the same size.

[Image Analyst]

If you no longer need the big cell arrays after that, you might clear them to free up memory:

clear('Tbv', 'Rvi');

Please officially accept the answer.

[Hana]

me = cellfun(@(tbv, rvi) mean(tbv(rvi>=0 & rvi<=0.2)), Tbv, Rvi); gives me 4 mean value seperately from tha pair (Tbv1,Rvi1)....(Tbv4,Rvi4) I need a single mean value from all the pairs.