Messagebox warning in matlab

Question

marie lasz 2020-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/599137-messagebox-warning-in-matlab

回答： Image Analyst 2020-9-25

hello everyone,

I am running this code and getting warning that text is too long for a messagebox. I set breakpoints and at message it is giving different values and showing messagebox without text. What am I doing wrong here?

code is given below;

close all
clc
workspace; 
im = imread('lena.bmp')
Image1= im;
im2 = imread('lena2.bmp')
Image2= im2;
NCC = normxcorr2(Image1,Image2);
message = sprintf('The normalized cross correlation is %.2f.', NCC);
msgbox(message); 

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Answer 1

Peter O 2020-9-24

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The NCC return value you're getting back is a matrix of correlation values (for Lena, it's 512x512). The string you're passing to messagebox will print that text 262,144 times (one for each value in the matrix), so yes, it gets pretty big!

Are you looking for the max correlation? If so, just wrap:

maxcorr = max(NCC(:)); % Single max across all
message = sprintf('The max normalized cross correlation is %.2f.', maxcorr);
msgbox(message); 

If you're interested in a pattern or more than a single quantity, it might be easier to view it as a 3D surface plot. See the worked example here: https://www.mathworks.com/help/images/ref/normxcorr2.html

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marie lasz 2020-9-24

If I am not wrong you meant that max() function selects the one closest value/average value from the set of array or matrix. It will print on message box otherwise these values are too big that it cannot be shown.

Peter O 2020-9-25

That's correct, it's the one max value which is friendlier to the message box. You could also use mean(NCC(:)) if you wanted the average of the entire matrix.

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