Image processing for a set of images but showing "Array indices must be positive integers or logical values" for another set of images?

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Yuhong Jin
Yuhong Jin 2019-11-24
评论： Walter Roberson 2019-11-25
I made an image processing script which can work for a set of images, but when I try to process another set of images with the same script, it shows errors saying "Array indices must be positive integers or logical values".
Could anyone help me with this please?
Array indices must be positive integers or logical values.
Error in training (line 16)
mean5=mean(double(A3(:)<1500))
This is my code:
%read images
A=imread('r30jun97.giant.04--1---2.tif');
%increase intensity
A1 = A*1000;
%mask
mask = A1>=2000;
A2 = uint16(mask).*A1;
%median filter to remove noise
meanFilter = ones(3)/9;
A3 = imfilter(A2,meanFilter);
%statistics
mean5=mean(double(A3(:)<1500));
sd5=sqrt(var(double(A3(:)<1500)));

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Walter Roberson
Walter Roberson 2019-11-24
Guessing
mask = A3<1500;
mean5 = mean(A3(mask));
sd5 = std(A3(mask)) ;
However you should check whether you accidentally created a variable named mean
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Yuhong Jin
Yuhong Jin 2019-11-25
My intention is to calculate the mean and standard deviation in a specified range of A3. Should I define another variable or I can do it with mean?
Walter Roberson
Walter Roberson 2019-11-25
In that case the code I posted above would work. Or you might prefer to write it as
A3_5 = A3(A3<1500);
mean5 = mean(A3_5);
sd5 = std(A3_5);

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