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

Accepted Answer

Image Analyst
Image Analyst on 23 Sep 2013
% 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
  2 Comments
maria ahmed
maria ahmed on 23 Sep 2013
Edited: maria ahmed on 23 Sep 2013
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
Image Analyst on 23 Sep 2013
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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