how display a array of image using a for loop

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mahendra kumar 2012-4-14

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i have stored 10 images in a array im=[im1,im2......],bt when i try to display it, it is not getting displaying i.e for i=1:10 figure, imshow(im(i)) plz can anyone help in figure out this problem

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Answer 1

Image Analyst 2012-4-14

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You're using linear indexing, which in effect only shows the first pixel of each image plane. If your images are grayscale images in a 3D array, you can do this:

for slice = 1 : size(im, 3)
  imshow(im(:,:,slice), []);
  drawnow;
  pause(0.5); % Wait 1/2 second to show each one.
end

The colon means " all rows" or " all columns" so I'm taking all rows and all columns of each slice and displaying that entire slice.

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mahendra kumar 2012-4-14

sir actually what i m trying to do is, i hav stored 3 images in a folder i.e an eye opened,eye closed and eye half opened image. so now i want to compare a sequence of 5 eye closed image with with my image comparing code to show no eye moment detected and in the 6th comparison i like to introduce a eye opened image and display that the eye moment has been detected. so i need to put 5 eye closed and 1 eye opened image in an array and sequentially retrieve it and do the comparison and display the result... so can i do this with the for loop or do i need anything eles

Image Analyst 2012-4-14

编辑：Walter Roberson 2012-8-10

Then see the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

Since eyes will be so different from one person the the next, I think it would be hard to compare images directly, for example through subtraction. I think you'd be better off analyzing each image and getting a feature vector of things, like "pupil present", "skin area fraction", "iris detected", etc. You should study up here to get some idea of how people do eye detection/tracking: http://iris.usc.edu/Vision-Notes/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics

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