why isn't image changing when it is supposed to?

Question

mark palmer 2023-2-26

0
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https://ww2.mathworks.cn/matlabcentral/answers/1919335-why-isn-t-image-changing-when-it-is-supposed-to

回答： mark palmer 2023-2-28

THis one has me stumped for two days straight. It seems like it should be the easiest thing in the world, but there's something I'm just not getting.

I want the image to change to the next image every time bb = 3, or fstep/2, and stay on that image otherwise. There will be other images coming in at different places, so I can't just adjust the starting point, it has to change at bb=fstep/2 exactly. Nothing I code will do this, it keeps changing only at bb=1 instead. I'm mystified, can anybody see what's wrong and can suggest a change with as little modification to the original code as possible?

clear all
clf
fpath1 = '/Users/owner/Documents/MATLAB1/';
addpath(fpath1);
pI1 = 1 + [0, 1, 2];
pIsiz = size(pI1,2);
IB = {'T5 01.jpg'; 'T5 02.jpg'; 'T5 03.jpg'};
fI1B = {IB{pI1(1:pIsiz)}};
fstep = 3; % FRAME STEPS BETWEEN EACH IMAGE ----------------
bbm = [(fstep/2)+1:fstep 1:fstep/2];
fstep = fstep * 2;
cc = 1;
for aa = 1:3
    astr = num2str2023(aa); % FILE NAME INCREMENT VALUE
    I2 = imread(fI1B{aa});
    for bb = 1:fstep
        [aa bb cc]
        if mod(cc,fstep) == fstep/2
            I2 = imread(fI1B{aa});
            fI1B{aa}
        end
        
        astr = num2str2023(aa); % FILE NAME INCREMENT VALUE
        bstr = num2str2023(bb);
        imf12 = [fpath1,'MTEST ' astr,' ', bstr, ' 2023.tif'];
        imwrite(I2, imf12, 'tif', 'Resolution', 720);
        cc = cc + 1;
    end
end