You can have a plot of average horizontal intensities.In case eye is closed the distance between two deep valleys would increase as eyelashes would move far from the brows: I1 = imread('openEyeImage'); I1 = rgb2gray(I1) plot(1:size(I1,1), mean(I1,2)); hold on I2 = imread('closeEyeImage'); I2 = rgb2gray(I2) plot(1:size(I2,1), mean(I2,2), 'r'); Check out the difference between two plots. Or you can go from blob detection, find circular objects. Call regionprops check out for ecentricity. This would be useful. As you can see from the plot distance between first two deep valleys(local minima) would be more for a closed image. You can set a threshold distance to check out weather image is closed. You can locate minima using findpeaks horizontalAverages = mean(I1, 2); plot(1:size(I1,1), horizontalAverages) [Minimas locs] = findpeaks(-horizontalAverages) hold on plot(locs, -1*Minimas, 'r*') if (locs(2)-locs(1)).

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