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The @ notation is for an anonymous function. It's a handle for a function
presumably this function myFilter is defined somewhere on your path or previously in the command window.
f = @(x) x^2; f(2)
f(2) returns 4 here.
In your example you are taking the image in grayImage and using the function myFilter() to operate on blocks of that image with dimension [windowSize windowSize]
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