I want to ask how can i compare intensity values of images with its database? and name them as high intensity and low intensity ? please help me out :)

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maria ahmed 2013-9-23

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采纳的回答： Image Analyst

.problem i am facing that how can i compare the intensity of images? and name them as high intensity or low intensity

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Answer 1

Image Analyst 2013-9-23

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在 MATLAB Online 中打开

% Read in the image.
grayImage = imread(yourFileName);
[rows. columns, numberOfColorChannels] = size(grayImage)
if numberOfColorChannels > 1
  % It's color so convert to grayscale (luminance).
  grayImage = rgb2gray(grayImage);
end
% Get it's mean with mean2().
meanValue = mean2(grayImage);
% Compare the image's mean with your definition of what is high or low.
if meanValue < 142 % or whatever...
  classification = 'Low Intensity';
else
  classification = 'High Intensity';
end

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maria ahmed 2013-9-23

编辑：maria ahmed 2013-9-23

Thanks...:)) it help me out..sir, but i want to compare it wi th data base of images ? so for this this what should i do in this code more?

Image Analyst 2013-9-23

Yes of course. You'll have to analyze all your images that you want to be in the database and find their means and store them in the database. Then "compare" a test image to each of the others in the database. You can use save() to create a simple database. You can compare in whatever way you'd like, for example by subtracting the means.

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