getting statistics from within a mask within an image
We have an image that represents data that only makes sense when it is analyzed in numerical format.
Specifically, the data needs to be analyzed as a function of radius as shown below
Im interested specifically in hte max and min values within each of the defined areas with respect to the center point.
Ive been looking at a few examples online and it seems this should work when you pull the data from a mask.
However, the issue is that I seem to be getting values that are not realistic.
How to get pixel value inside a circle – MATLAB Answers – MATLAB Central (mathworks.com)
how to draw circle in an image? – MATLAB Answers – MATLAB Central (mathworks.com)
this is what I am doing
clear
img = double(imread(‘img121.jpg’));; %no filtration
img = -(0.0316*img) +8.3; % we did this as we cant calibeate the film, we scan the same film over and over and it changes by 80pixels
img = imrotate(img, 90);
img = imgaussfilt(img ,1.5);
figure, imagesc(img )
axis image
height2 = 3.6
caxis([0 height2])
colorbar
title(‘ ‘)
impixelinfo
%# make sure the image doesn’t disappear if we plot something else
hold on
%https://www.mathworks.com/matlabcentral/answers/1931825-how-to-get-pixel-value-inside-a-circle
%below looks like what we want
%https://www.mathworks.com/matlabcentral/answers/1931825-how-to-get-pixel-value-inside-a-circle
%# define points (in matrix coordinates)
%3"
cpx = 2050;
cpy = 2020;
inchlist = [12,10.5,9,7.5,6,4.5];
%draw lines on heel axis
for n=1:size(inchlist,2)
inch= inchlist(n)/4;
hcirc = drawcircle(‘Center’,[2050,2020],’Radius’,inch*590,’StripeColor’,’red’);
mask1 = hcirc.createMask;
maxval = (max(img(mask1)));
minval = (min(img(mask1)));
uniformity = maxval/minval
% p1 = [cpy-100,cpx+inch*590];
end
Even after getting this max and min value, I will need to remove 10 to get rid of noise. Extra credit if you can point me to a soluton for that too.
thank youWe have an image that represents data that only makes sense when it is analyzed in numerical format.
Specifically, the data needs to be analyzed as a function of radius as shown below
Im interested specifically in hte max and min values within each of the defined areas with respect to the center point.
Ive been looking at a few examples online and it seems this should work when you pull the data from a mask.
However, the issue is that I seem to be getting values that are not realistic.
How to get pixel value inside a circle – MATLAB Answers – MATLAB Central (mathworks.com)
how to draw circle in an image? – MATLAB Answers – MATLAB Central (mathworks.com)
this is what I am doing
clear
img = double(imread(‘img121.jpg’));; %no filtration
img = -(0.0316*img) +8.3; % we did this as we cant calibeate the film, we scan the same film over and over and it changes by 80pixels
img = imrotate(img, 90);
img = imgaussfilt(img ,1.5);
figure, imagesc(img )
axis image
height2 = 3.6
caxis([0 height2])
colorbar
title(‘ ‘)
impixelinfo
%# make sure the image doesn’t disappear if we plot something else
hold on
%https://www.mathworks.com/matlabcentral/answers/1931825-how-to-get-pixel-value-inside-a-circle
%below looks like what we want
%https://www.mathworks.com/matlabcentral/answers/1931825-how-to-get-pixel-value-inside-a-circle
%# define points (in matrix coordinates)
%3"
cpx = 2050;
cpy = 2020;
inchlist = [12,10.5,9,7.5,6,4.5];
%draw lines on heel axis
for n=1:size(inchlist,2)
inch= inchlist(n)/4;
hcirc = drawcircle(‘Center’,[2050,2020],’Radius’,inch*590,’StripeColor’,’red’);
mask1 = hcirc.createMask;
maxval = (max(img(mask1)));
minval = (min(img(mask1)));
uniformity = maxval/minval
% p1 = [cpy-100,cpx+inch*590];
end
Even after getting this max and min value, I will need to remove 10 to get rid of noise. Extra credit if you can point me to a soluton for that too.
thank you We have an image that represents data that only makes sense when it is analyzed in numerical format.
Specifically, the data needs to be analyzed as a function of radius as shown below
Im interested specifically in hte max and min values within each of the defined areas with respect to the center point.
Ive been looking at a few examples online and it seems this should work when you pull the data from a mask.
However, the issue is that I seem to be getting values that are not realistic.
How to get pixel value inside a circle – MATLAB Answers – MATLAB Central (mathworks.com)
how to draw circle in an image? – MATLAB Answers – MATLAB Central (mathworks.com)
this is what I am doing
clear
img = double(imread(‘img121.jpg’));; %no filtration
img = -(0.0316*img) +8.3; % we did this as we cant calibeate the film, we scan the same film over and over and it changes by 80pixels
img = imrotate(img, 90);
img = imgaussfilt(img ,1.5);
figure, imagesc(img )
axis image
height2 = 3.6
caxis([0 height2])
colorbar
title(‘ ‘)
impixelinfo
%# make sure the image doesn’t disappear if we plot something else
hold on
%https://www.mathworks.com/matlabcentral/answers/1931825-how-to-get-pixel-value-inside-a-circle
%below looks like what we want
%https://www.mathworks.com/matlabcentral/answers/1931825-how-to-get-pixel-value-inside-a-circle
%# define points (in matrix coordinates)
%3"
cpx = 2050;
cpy = 2020;
inchlist = [12,10.5,9,7.5,6,4.5];
%draw lines on heel axis
for n=1:size(inchlist,2)
inch= inchlist(n)/4;
hcirc = drawcircle(‘Center’,[2050,2020],’Radius’,inch*590,’StripeColor’,’red’);
mask1 = hcirc.createMask;
maxval = (max(img(mask1)));
minval = (min(img(mask1)));
uniformity = maxval/minval
% p1 = [cpy-100,cpx+inch*590];
end
Even after getting this max and min value, I will need to remove 10 to get rid of noise. Extra credit if you can point me to a soluton for that too.
thank you mask, statistics MATLAB Answers — New Questions
