imsubtract - Subtract one image from another or subtract constant from image
Syntax
Z = imsubtract(X,Y)
Description
Z = imsubtract(X,Y) subtracts each element
in array Y from the corresponding element in array X and
returns the difference in the corresponding element of the output
array Z. X and Y are
real, nonsparse numeric arrays of the same size and class, or Y is
a double scalar. The array returned, Z, has the
same size and class as X unless X is
logical, in which case Z is double.
If X is an integer array, elements of the output that exceed
the range of the integer type are truncated, and fractional values
are rounded.
Note
On Intel architecture processors, imsubtract can
take advantage of the Intel Integrated Performance Primitives
(Intel IPP) library, thus accelerating its execution time. The
(Intel IPP) library is activated only if array X is
of class uint8, int16, or single. |
Examples
Subtract two uint8 arrays. Note that negative
results are rounded to 0.
X = uint8([ 255 10 75; 44 225 100]);
Y = uint8([ 50 50 50; 50 50 50 ]);
Z = imsubtract(X,Y)
Z =
205 0 25
0 175 50Estimate and subtract the background of an image:
I = imread('rice.png');
background = imopen(I,strel('disk',15));
Ip = imsubtract(I,background);
imshow(Ip,[])Subtract a constant value from an image:
I = imread('rice.png');
Iq = imsubtract(I,50);
figure, imshow(I), figure, imshow(Iq)See Also
imabsdiff, imadd, imcomplement, imdivide, imlincomb, immultiply, ippl
 | imshow | | imtool |  |
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