imabsdiff - Absolute difference of two images
Syntax
Z = imabsdiff(X,Y)
Description
Z = imabsdiff(X,Y) subtracts each element
in array Y from the corresponding element in array X and
returns the absolute difference in the corresponding element of the
output array Z. X and Y are
real, nonsparse numeric arrays with the same class and size. Z has
the same class and size as X and Y.
If X and Y are integer arrays,
elements in the output that exceed the range of the integer type are
truncated.
If X and Y are double
arrays, you can use the expression abs(X-Y) instead
of this function.
Note
This function may take advantage of hardware optimization for
data types uint8, int16, and single to
run faster. Hardware optimization requires that arrays X and Y are
of the same size and class. |
Examples
Calculate the absolute difference between two uint8 arrays.
Note that the absolute value prevents negative values from being rounded
to zero in the result, as they are with imsubtract.
X = uint8([ 255 10 75; 44 225 100]);
Y = uint8([ 50 50 50; 50 50 50 ]);
Z = imabsdiff(X,Y)
Z =
205 40 25
6 175 50Display the absolute difference between a filtered image and
the original.
I = imread('cameraman.tif');
J = uint8(filter2(fspecial('gaussian'), I));
K = imabsdiff(I,J);
imshow(K,[]) % [] = scale data automaticallySee Also
imadd, imcomplement, imdivide, imlincomb, immultiply, imsubtract, ippl
 | im2uint8 | | imadd |  |
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