what does this code mean?

2012 11 20
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1/(mean(mean(I1(xy_index(2)+(-7:7),xy_index(1)+(-7:7),1)))/mean(mean(I2(xy_index(2)+(-7:7),xy_index(1)+(-7:7),1))))

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Matt Fig
Matt Fig 2012-11-20
编辑：Matt Fig 2012-11-20

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It appears to be finding the ratio of the mean values of two 15 element square subarrays, each from a different array.

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satish thapaliya
satish thapaliya 2012-11-20
actually I was interested in color calibration for the imaging system by using different intensity images. by using this command i got the value between 0 to 1 for different group of images. is it the pixel value for gray scale image transformed from digital image or something else?
satish thapaliya
satish thapaliya 2012-11-20
编辑：Walter Roberson 2012-11-20
the whole command for the first set of image was as follow
I1 = imread('E:\allergen-data\20120823\folder 3\3.BMP');
subplot(211)
imshow(I1)
I2 = imread('E:\allergen-data\20120823\folder 2\14.BMP');
subplot(212)
imshow(I2)
I1 = rgb2gray(I1);
I2 = rgb2gray(I2);
xy_index = [310 820];
1/(mean(mean(I1(xy_index(2)+(-7:7),xy_index(1)+(-7:7),1)))/mean(mean(I2(xy_index(2)+(-7:7),xy_index(1)+(-7:7),1))))
it displays ans in the value between 0 to 1. could you help what is it actually?
Walter Roberson
Walter Roberson 2012-11-20
It is not a gray scale value. It is "something else".
It does not produce a value between 0 and 1: it can produce infinity in some cases.
The expression is of the form 1 / (A / B) . That could be rewritten as B/A, which makes it clearer that what it produces is a ratio of the grayscale intensities of the mean color of the respective two blocks.
satish thapaliya
satish thapaliya 2012-11-20
Thanks Roberson

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