How can I find maxima and minima points of intensity plot of one row of an image?

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Samidha 2013-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/108899-how-can-i-find-maxima-and-minima-points-of-intensity-plot-of-one-row-of-an-image

评论： Samidha 2013-12-10

I want to plot intensity of single row of an MRI image, for that firstly I wrote -

i=dicomread('mri_7.dcm');
imshow(i)
improfile

from this I got intensity plot of any row or column. Now I want to find maximum and minimum values of that plot.So,please help me to get solution of this obstacle.

Thank you

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Answer 1

Image Analyst 2013-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/108899-how-can-i-find-maxima-and-minima-points-of-intensity-plot-of-one-row-of-an-image#answer_117518

在 MATLAB Online 中打开

test.m

Don't use i (the imaginary variable) as an image name or loop counter.

Try this:

oneRow = grayImage(myRow, :);
% Find the min and max
[minGL, indexOfMin] = min(oneRow)
[maxGL, indexOfMax] = max(oneRow)

See my demo, test.m, attached below in blue, which will generate the following figure.

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Samidha 2013-12-8

在 MATLAB Online 中打开

thank you very much for your reply.. I get max nd min value in numerical form, I don't find profile plot which i want. I write- grayImage=dicomread('mri_7.dcm'); oneRow = grayImage(111, :); % Find the min and max [minGL, indexOfMin] = min(oneRow) [maxGL, indexOfMax] = max(oneRow)

minGL =

0

indexOfMin =

1

maxGL =

105

indexOfMax =

97

Samidha 2013-12-10